Best AA Batteries
Don't Get Caught In The Dark: The AmazonBasics Performance Alkaline batteries are developed with a patented Japanese technology providing power, quality and reliability for everyday devices. Superior Performance: The AmazonBasics Performance Alkaline batteries perform as good or better than the top branded batteries on the market. Stays Connected: The batteries +ve and –ve terminals maintain a consistent contact with devices through a unique processing on the surface of the positive and negative terminals. Works with a variety of devices including digital cameras, game controllers, toys, and clocks; do not attempt to recharge.
Reviews
Find Best Price at Amazon"For the Amazon Basics batteries, the capacity at each discharge rate was: Disch Rt | Capacity | Runtime | Sample use case. 100 mA | 997 mAh | 10 hrs | Low-power LED flashlight. 200 mA | 914 mAh | 4.5 hrs | Electronic toy / medium LED flashlight. 400 mA | 623 mAh | 1.5 hrs | Motorized toy / bright LED flashlight. Note that these (and all other Alkalines) would achieve somewhat higher capacity (maybe 1200 mAh) in a low discharge application like a mouse, keyboard, remote control, etc because alkaline batteries have internal resistance that reduces usable capacity at high discharge rates. Their capacity results were: Disch Rt | Capacity | Runtime. 100 mA | 1005 mAh | 10 hrs. 200 mA | 864 mAh | 4.3 hrs. 400 mA | 670 mAh | 1.7 hrs. As you can see, the Amazon batteries were very comperable ... but, at the current time the AmazonBasics batteries are $0.31/ea (36 pack), while the ACDelco batteries are about $0.21/ea (48 pack) -- so the ACDelco are significantly cheaper per mAh. I ran the Rayovac test several times because I couldn't believe how poorly they did ... here are some typical Rayovac results: Disch Rt | Capacity | Runtime. 100 mA | 908 mAh | 9 hrs. 200 mA | 590 mAh | 2.9 hrs. 400 mA | 443 mAh | 1.1 hrs. My other battery tests/reviews: I have posted reviews for Duracell Coppertop, Duracell Procell and ACDelco aaa alkaline batteries with capacity data gathered using the exact same method and equipment. ACDelco AAA Super Alkaline Batteries. Duracell AAA Batteries Coppertop MN2400 - 20 Pack. Duracell Procell AAA Batteries PC2400BKD09. Energizer MAX AAA Batteries. Maxell Alkaline Battery AAA Cell. Rayovac Alkaline AAA Batteries."
"One strong factor is that these claim to be made in Japan, and Japanese-made batteries from Panasonic, Sony, Maxell and other major name brands have a good reputation. The biggest change I understand is the shelf life of the newest formulation is now rated at 10 years. I haven’t been able to see any downsides, and I do like saving money that would be wasted for fancy packaging and expensive advertising, so unless something drastically changes I believe these will now be my brand of choice."
"It helps me save a lot of money and avoid the trouble of running to the shop every time I need batteries."
Dependable, long-lasting performance in a wide range of devices. Works with a variety of devices including digital cameras, game controllers, toys, and clocks; do not attempt to recharge.
Reviews
Find Best Price at Amazon"For the Amazon Basics batteries, the capacity at each discharge rate was: Disch Rt | Capacity | Runtime | Sample use case. 100 mA | 997 mAh | 10 hrs | Low-power LED flashlight. 200 mA | 914 mAh | 4.5 hrs | Electronic toy / medium LED flashlight. 400 mA | 623 mAh | 1.5 hrs | Motorized toy / bright LED flashlight. Note that these (and all other Alkalines) would achieve somewhat higher capacity (maybe 1200 mAh) in a low discharge application like a mouse, keyboard, remote control, etc because alkaline batteries have internal resistance that reduces usable capacity at high discharge rates. Their capacity results were: Disch Rt | Capacity | Runtime. 100 mA | 1005 mAh | 10 hrs. 200 mA | 864 mAh | 4.3 hrs. 400 mA | 670 mAh | 1.7 hrs. As you can see, the Amazon batteries were very comperable ... but, at the current time the AmazonBasics batteries are $0.31/ea (36 pack), while the ACDelco batteries are about $0.21/ea (48 pack) -- so the ACDelco are significantly cheaper per mAh. I ran the Rayovac test several times because I couldn't believe how poorly they did ... here are some typical Rayovac results: Disch Rt | Capacity | Runtime. 100 mA | 908 mAh | 9 hrs. 200 mA | 590 mAh | 2.9 hrs. 400 mA | 443 mAh | 1.1 hrs. My other battery tests/reviews: I have posted reviews for Duracell Coppertop, Duracell Procell and ACDelco aaa alkaline batteries with capacity data gathered using the exact same method and equipment. ACDelco AAA Super Alkaline Batteries. Duracell AAA Batteries Coppertop MN2400 - 20 Pack. Duracell Procell AAA Batteries PC2400BKD09. Energizer MAX AAA Batteries. Maxell Alkaline Battery AAA Cell. Rayovac Alkaline AAA Batteries."
"One strong factor is that these claim to be made in Japan, and Japanese-made batteries from Panasonic, Sony, Maxell and other major name brands have a good reputation. The biggest change I understand is the shelf life of the newest formulation is now rated at 10 years. I haven’t been able to see any downsides, and I do like saving money that would be wasted for fancy packaging and expensive advertising, so unless something drastically changes I believe these will now be my brand of choice."
"It helps me save a lot of money and avoid the trouble of running to the shop every time I need batteries."
Plus, the AA and AAA sizes are designed to protect devices from leakage of fully used batteries up to 2 years. *Energizer will repair or replace, at our option, any device damaged by leakage from Energizer MAX Alkaline batteries either during the life of the battery or within two years following the full use of the battery. Our #1 Longest Lasting MAX AAA battery powers everyday devices.
Reviews
Find Best Price at Amazon"These batteries are being used in a Honeywell digital thermostat."
"These Energizer batteries last longer and don't leak battery acid."
"Great price too, plus it saved me a trip to the store."
"I use a lot of AAA batteries because of the number of electronics owned by my family."
"Unlike big boxed batteries of another brand I have bought here before, these have and are working great, just as if I bought them at the store."
"They do what AAA Energizer batteries are suppose to do!!!"
"They are great!"
"Thank you to Amazon for carrying batteries."
Best Batteries, Chargers & Accessories
From ANKER, America's Leading USB Charging Brand • Faster and safer charging with our advanced technology. • 10 million+ happy users and counting. High-speed-Charging Technology Anker's exclusive PowerIQ and VoltageBoost technologies combine to ensure the fastest possible charge up to 2.4 amps. Notes: • Please use the original Apple charging cable (not included) to charge Apple products. What You Get: Anker PowerCore 10000 portable charger, Micro USB cable, travel pouch, welcome guide, our worry-free 18-month warranty and friendly customer service.
Reviews
Find Best Price at Amazon"I travel quite a bit and haven't printed a boarding pass in quite a while... As the practice of e-boarding passes continues to increase, so will the instances of anxiety due to a low battery while waiting in the security line or at the gate! I recently purchased and reviewed the Lumsing Ultrathin Portable 3-Port USB Charger 10000mAh... This thing was great except is made a high pitch noise when it charged another device. Cons: I actually prefer the taller/thinner form of the Lumsing which keeps the device ports easily accessible when in the inside pockets of my sports coat."
"So far, I've been able to charge my phone about 4 times from near empty to full before having to charge the power bank. The power bank itself requires at least 2 hours to charge from empty to full but once charged, your phone will charge to full in less time."
"On the left is the older 10,000mAh charger, right is the newer 20,000mAh charger, this charger in the middle. All things said, the charger worked amazingly well, much faster than the previous iteration of the 10,000mAh charger and much better than I expected. I have had an issue with an older charger with a built in cable, and while the charger was no longer available for sale Anker sent me a voucher for the full value of my charger, which I was able to use to purchase the older 10,000mAh charger you see in the photos."
"In less than six months three of us have replaced our broken micro usb cables. The Anker cables that come with the Anker power bank are run-of-the-mill at best. My point...if you're comfortable with having to replace the cable at some point (it's likely) than this is an awesome power bank."
Best Sales & Deals
Make every beat count with Fitbit Charge 2—the all-new heart rate and fitness wristband built for all-day, workouts and beyond. PurePulse continuous, automatic wrist-based heart rate tracking to better measure calorie burn all day.
Reviews
Find Best Price at Amazon"I found the Fitbit to be an incredible fitness device compared to the Apple watch. The fitbit can also track sleep, and give you an estimate of your cardio fitness score (V02 Max). Other features: Clearly the fitbit is not a smart watch, but the text and call notifications are great when you're working out and don't have quick access to your phone. Accuracy: Tie. I have no idea what the negative reviews are talking about (Maybe they received a defective device or have exceptionally hairy arms?). The apple watch is slightly more accurate when it comes to distance, and probably more suited for someone who runs at a competitive pace. I love watching my cardio fitness score change and keeping an eye on my resting heart rate overnight. Apple has a ton of 3rd party apps which are great, but it lacks the complete integration of the fitbit. I haven't decided which one I will be keeping yet, but if I were basing my decision on fitness alone, at a non competitive level, I would choose the fitbit hands down. There are other useful features that make the Apple watch appealing in my line of work, so I'll have to weigh those into my decision. The apple watch doesn't have the same coolness factor with regard to fitness, and really doesn't motivate me to workout anymore than my iPhone would. It is perfect for someone who doesn't care about tracking fitness goals, but wants to leave their phone at home during a workout. The ability to stream music, track distance with a built in GPS, and respond to text messages are wonderful. I have a 7 inch wrist and the large band fits me on the last 2-4 holes (keep it loose when not working out)."
"As a Blaze and original Charge HR owner, figured I'd try my hand at the newest Fitbit Charge 2. It replaces the original best selling Charge & Charge HR. Steps, Flights, Heart Rate, Calories Burned, Connected GPS (shows a little map post workout when tied to your phone, and yes, you need to bring your phone with you on walks/runs), and notifications (as of now, just texts, calendar alerts, and displays phone number of incoming calls). The Charge watch has been the workhorse of the fitbit line. Since you're familiar with the Charge already, let's go over some of the issues you may have experienced and highlights/common questions answered: 1) Build Quality: The Charge 2 is a far far superior quality than the original Charge. **If you had problems with your original Charge band bubbling, the ability to swap bands and how the tracker is connected to the bands should eliminate the issues you have experienced ** Obviously way too early to make a call on how the device will hold up, but given my experience with Blaze & Alta, this feels similar in build quality, if not better, and neither of those devices have suffered from bands falling apart on a wide scale. 5) Display is nice, 4x larger than the original Charge. The font is a bright offwhite, as opposed to the original Charge that had a soft almost blue to it. Some display day & date, and most have option to where when you tap the display it will cycle through stats (may display heart rate, date, steps taken, how far you are in your goals, your hourly movement reminders, etc). Yes, two of the watch faces are digital (numbers display, not hands) and have seconds displayed. There is no 3rd party support at this time such as facebook, instagram, etc (The Blaze watch will be offering these soon in next software upgrade, so I guess there is hope the Charge 2 will get those as well). Heart rate was spot on as it usually was with original Charge HR & my Blaze. Obviously some folks have trouble with them due to body hair and whatnot, but the sensors on Charge HR, Blaze, and now Charge 2 seem to be spot on. An issue I had with the original Charge was it getting "lost" when I hit higher cardio levels. CONS: - vibration is notably weaker than the original Charge. The Charge HR slowly scrolls texts and notifications to you, which can be annoying if you're used to the Blaze. They serve their purpose well though, and I can't ding it for this as it's a step up from the original Charge. The Blaze is their high end product at the moment, but the Charge 2 is a very close second. I'll happily answer questions as I did for when I originally reviewed the Blaze out of the gate, and edit this review to reflect common questions or any issues I face as I put the device through its paces in the coming days."
Best AAA Batteries
Size: AAA |. Style: 100-Pack. Works with a variety of devices including digital cameras, game controllers, toys, and clocks; do not attempt to recharge.
Reviews
Find Best Price at Amazon"For the Amazon Basics batteries, the capacity at each discharge rate was: Disch Rt | Capacity | Runtime | Sample use case. 100 mA | 997 mAh | 10 hrs | Low-power LED flashlight. 200 mA | 914 mAh | 4.5 hrs | Electronic toy / medium LED flashlight. 400 mA | 623 mAh | 1.5 hrs | Motorized toy / bright LED flashlight. Note that these (and all other Alkalines) would achieve somewhat higher capacity (maybe 1200 mAh) in a low discharge application like a mouse, keyboard, remote control, etc because alkaline batteries have internal resistance that reduces usable capacity at high discharge rates. Their capacity results were: Disch Rt | Capacity | Runtime. 100 mA | 1005 mAh | 10 hrs. 200 mA | 864 mAh | 4.3 hrs. 400 mA | 670 mAh | 1.7 hrs. As you can see, the Amazon batteries were very comperable ... but, at the current time the AmazonBasics batteries are $0.31/ea (36 pack), while the ACDelco batteries are about $0.21/ea (48 pack) -- so the ACDelco are significantly cheaper per mAh. I ran the Rayovac test several times because I couldn't believe how poorly they did ... here are some typical Rayovac results: Disch Rt | Capacity | Runtime. 100 mA | 908 mAh | 9 hrs. 200 mA | 590 mAh | 2.9 hrs. 400 mA | 443 mAh | 1.1 hrs. My other battery tests/reviews: I have posted reviews for Duracell Coppertop, Duracell Procell and ACDelco aaa alkaline batteries with capacity data gathered using the exact same method and equipment. ACDelco AAA Super Alkaline Batteries. Duracell AAA Batteries Coppertop MN2400 - 20 Pack. Duracell Procell AAA Batteries PC2400BKD09. Energizer MAX AAA Batteries. Maxell Alkaline Battery AAA Cell. Rayovac Alkaline AAA Batteries."
"It helps me save a lot of money and avoid the trouble of running to the shop every time I need batteries."
"One strong factor is that these claim to be made in Japan, and Japanese-made batteries from Panasonic, Sony, Maxell and other major name brands have a good reputation. The biggest change I understand is the shelf life of the newest formulation is now rated at 10 years. I haven’t been able to see any downsides, and I do like saving money that would be wasted for fancy packaging and expensive advertising, so unless something drastically changes I believe these will now be my brand of choice."
Best AAAA Batteries
Energizer 6 NEW AAAA Batteries. Enter your model number to make sure this fits.
Reviews
Find Best Price at Amazon"If you need AAAA batteries look no further."
"Yup they are batteries and they are energizer."
"needed for a hearing aid device and can't find them anywhere."
"Didn't even know this size of batteries existed, and could not find these anywhere in Saudi so I ordered them online to ship to the US."
"AAAA are hard to find, Otherwise they are Energizer Batteries."
"I have to admit I was skeptical when I ordered these batteries because they were priced so reasonably, but have been pleasantly surprised."
"Couldn't find these at any store; was so glad to find them here at such a great price."
"Did not realize they would not be in the original Energizer packaging."
Best A Batteries
Features of EBL 839 battery charger: When your rechargeable batteries are out of power, you need a battery charger, and this EBL battery charger is a very good choice for you. Specification of EBL 839 battery charger: Input: 100-240V AC (Worldwide used voltage) Max: 150mA. Output: 4.2V DC 450mA. Compatible: 10440/14500/16340/18500/18650 li-ion battery. Battery charging rate: over 80%. No Load Power Consumption:1W MAX. Full Load power consumption:7W MAX. Size: 3.5*1.3*1.3 inch Weight: 2.5oz. Compatible with. : 10440/14500/16340/18500/18650 li-ion battery. Package: 2 Pack EBL rechargeable 18650 batteries. 1 Pack EBL 839 battery charger. 1 X user manual. Only charging for Lithium battery,do not charging for other type of batteries.
Reviews
Find Best Price at Amazon"Of course you could get $30+ batteries with better statistics but this company (EBL) is as good as it gets for a few bucks."
"The directions say to put the + end of the battery at the + end of the charger and leave it there until the charging light turns green. I put the battery back in the charger the other way around with the + terminal at the top and the charging light immediately went green."
"Battery charger indicator gave false reading not sure if it was fully charged."
"It charges batteries."
"Batteries seem to work good but the charger does not holed the batteries in place very well."
"2 EBL 18650 Rechargeable Batteries and a charger."
"Nice charger, easynto pack and has nice charge indicator."
"Additionally, the charger doesn't adequately charge battery before the indicator turns green indicating the battery is fully charged."
Best C Batteries
These Pro cell C Batteries are designed for use in flashlights, radios and tape recorders. Provide superior end-user value and savings on overallbattery cost.
Reviews
Find Best Price at Amazon"Same batteries as all the popular brands but at a fantastic price."
"Excellent product."
"I was hesitate to order batteries online, but went ahead with fingers crossed and I ordered the 24ct C batteries."
"Just as advertised - PROCELL C batteries are the best I've found and this price is great."
"Seem to be working good."
"I go through a lot of these on my out door sensor cameras, taking photos of the wild critters that come onto my property."
"Great deal if you have a commercial space with lots of led candles to draw in the patrons."
"Don't waste your time waiting for the batteries and refunds!"
Best D Batteries
The Rayovac Ultra Pro Alkaline D Batteries are the smart choice for your battery powered devices because they last as long as other leading brands, but cost less. For commercial applications.
Reviews
Find Best Price at Amazon"I was told by my audiologist that batteries have changed a lot in the last year or two and don't always hold their voltage as the old lead or mercury batteries did."
"I used to be a Duracell customer till I had to throw away my 4 cell Maglite due to battery's , tried Rayovac couldn't be more pleased, I highly recommend Rayovac."
"What can I say batteries with a nice case to hold them."
"They will ALL leak when discharged."
"Came in a nice case that holds the one's not being used."
"It's a 12-pack of D batteries, as advertised."
"Stored in a dry, dark, room temperature environment."
"I bought it in this box for obvious reasons."
Best 6V Batteries
Genuine Petsafe brand. 3-Pack (6 Batteries) Genuine PetSafe RFA-67/RFA-67D-11 Batteries.
Reviews
Find Best Price at Amazon"We have had the Petsafe containment system for some time now, and I get this 2-pack on a subscribe and save program every other month."
"I was happy to find replacements for the smart keys at an affordable price with same day delivery options."
"I've bought so many of these batteries on Amazon trying to find the best bang for my buck."
"I know you're frustrated you just chased your pooch around the neighborhood....but there is light at the end of the tunnel."
"Price for the pack was very good compared to the other products listed in amazon."
"Our babies can go out and run around our yard without fear or worry that they will get out of the yard."
"My suggestion: Pay the extra money and buy them direct from the company or at the big name pet stores where the stock should be fresh."
"Was excited to get these so quickly in the mail however the 1st battery lasted 2 days before it died."
Best 9V Batteries
Size: 9V. Industrial use.
Reviews
Find Best Price at Amazon"Procell batteries come in bulk packaging for easy use, distribution and access. These batteries have a 7 year shelf life, quoted from the Duracell website: "Procell batteries deliver outstanding performance with a 7-year freshness guarantee backed up with date coding." Before you buy, check out this product and see if its a better price... it is the same thing: DURACELL 9 Volt PROCELL Professional Alkaline Battery, Pack of 12."
"I have not load tested a full cycle yet but expect them to live up to Duracell's decent quality."
"That's all we need from our batteries. >>You should always date batteries when you install them.<<. Regarding their main competitor: we've had constant trouble with Energizer batteries leaking, and we've had to discard over $100 of electronic equipment caused by numerous leaking Energizer batteries."
"When you have a lot of smoke detectors all start chirping because of low batteries this is a great solution. I have replaced 2 more smoke detector batteries with this pack of 12."
"I shopped around and compared prices for 9V batteries at local stores and this one still came out cheaper battery per battery!"
"The packaging was pretty marginal, so the batteries were rattling around in the cardboard mailer."
"Want old school reliable 9 volt batteries then these are what you need."
"This battery I used lasted less than 30 minutes compared to 5 to 7 hours I get with the real Duracell batteries."
Best 3V Batteries
Our AmVolt size 2032 cr batteries provide reliable, long-lasting power for your devices. Unlike cheap imitations available in the market, our batteries are verified manufacturer quality and provide dependable service for up to two years, regardless the device they're used in. The AMVOLT CR2032 pack of lithium button coin batteries is designed to work with remotes, watches, key entry, computer motherboards, PDAs, calculators, door chines, electronic organizers, garage door openers, games, toys, MP3 players, voice recorders, LED lights, pet collars, pedometers, calorie counters, medical devices, and many more devices! With the AMVOLT pack of high-quality batteries that are leak-free and designed to service your devices for up to two years, you’ve got your convenience in check! This power pack is a perfect replacement for 2032 3 Volts Lithium Batteries: Panasonic CR2032 , Maxell CR2025 , Energizer E-CR2032BP ECR2032BP ECR2032 , Duracell DL2032 Duralock 2032 , Rayovac KECR2032 , Sony CR2032A CR-2032 , GP GPCR2032 , 5004LC , 5004LB , BR2032 , ST-T15 , LM2032 , L14 , EA2032C EA-2032C , L2032 , DJ2032 , KL2032 , SB-T51 , CR2032BH , and CR2032EC.
Reviews
Find Best Price at Amazon"A great buy for the price!"
"Easy to open and take just one or two out, leaving the rest on the card for storage."
"Got them, installed one and the gadget is working again."
"Furthermore, the AmVolt / Pennypinch Team, emailed me and follow-up, to ensure that my package arrived and all the batteries are in working condition."
"Lots of choices for batteries... but this one had an expiration date on it."
"I bought these batteries because of the price and the reviews but what I didn't know about was the customer service."
"UPDATE: I bought these in Nov 2017 and put one in my car key fob."
"Two stars because they are lower priced than the name brands, but these do NOT last as long as the name brand batteries."
Best 12V Batteries
Color: Black. Quality Assurance - Crafted Wtih A Rugged Construction, Our SLA Batteries Are Ultra Durable And Utilize Absorbed Glass Mat (AGM) Technology Which Provides A Wide Temperature Range.
Reviews
Find Best Price at Amazon"Great so far, got my Tailgater back in shape (able to use cordless for extended periods again)."
"I bought this for my security system."
"When I received this battery, I found that it fit into the battery compartment of the lawn mower perfectly. Installed it and it started the lawn mower right up.The lawn mower is now sitting in the garage with a battery maintainer on it for the winter."
"I thought I read reviews here that stated an adapter was included, but that was not the case, so it must have been a different product."
"I purchased this battery in April of 2016 to replace the original battery (which lasted 8 years) in a home alarm system and it lasted about 18 months."
"Ordered this batter 1 year and 16 days ago for my home security system."
"I purchased this to replace a home alarm battery that finally wore out after 7 years."
"Says 5 AH but could run a 700 mAmp (.7 A) load for only two hours."
Best 3.7V Batteries
Nominal discharge capacity : 2500mAh. Charge: 1.25A, 4.20V,CCCV 100mA cut-off, Discharge: 0.2C, 2.5V discharge cut-off. 2. Charging time: Standard charge : 180min / 100mA cut-off. Rapid charge: 60min (at 25 °C) / 100mA cut-off. 6. Enter your model number to make sure this fits.
Reviews
Find Best Price at Amazon"The charge rate for the initial charge was 0.5A. -Cell 1 charged 1697mAh. -Cell 2 charged 1714mAh. -Cell 3 charged 1701mAh. -Cell 4 charged 1724mAh. -Now before anyone raises the question of why 2500mAh was not charged in, allow me to make the point that these cells were not fully discharged to approx 3.2V prior to their initial charge. **UPDATE**. After running these in my RX2/3 for 2 cycles per pair, I am satisfied so far with their authenticity."
"These things hold a charge for quite some time."
"The batteries are also paked in pairs in nice little plastic (reusable) boxes."
"This is my second time ordering these."
"Have not had them long enough for a charge review, but they look original they weigh right."
"I was led to believe these are the best thing to get."
"I have bought a lot of these Samsung batteries."
"I also have two Panasonic batteries, and even though they're over a year old, they're still stronger than this set of (supposed) Samsungs."
Best Coin & Button Cell Batteries
The Energizer 2032 lithium coin battery offers dependable performance in household devices like heart-rate monitors, keyless entry, glucose monitors, games, toys and more. Do not disassemble, charge, crush or expose to fire or high temperatures. Zero mercury Energizer CR2032 batteries offer premium performance in a variety of devices.
Reviews
Find Best Price at Amazon"Good lithium batteries that are at a good price since you get 6 batteries in the package."
"Seems everything requires a 2032 battery these days, the ability to buy in bulk at a reasonable price vs searching the brick and mortar for a single over priced battery makes this purchase a great deal."
"I needed to change my Dreamcast Vmu batteries and they also work in my car's key fob so this 6 pack serves multiple purposes."
"I purchased these batteries for use in my dog bark collars and they have held up well."
"used for my snark guitar tuner , the snark wouldn't turn on with off brand batteries ,emailed company they said to try energizer or duracell ,, the tuner works perfect now!"
"The only cautionary tale I have is that you just can't let these sit around for a long time and expect them to work."
"I needed a new battery for my Apple Tv remote."
"Bought these for my Pokemon Go bracelet, work great!"