Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Please see our full disclaimer below.
I bought these batteries for my UP Move fitness tracker. I tried 3 batteries from one pack and 1 from the other and they either didn't work at all or they didn't power the tracker enough to sync with my phone. There was something printed on the back of the package on each individual battery that was marked out with a black Sharpie. (see picture) Returned.
Get what you pay for here. We got these to power a small temperature sensor for our thermostat but they last only a few days each, some less than 24-hours. (Previous batteries typically lasted months). Maybe they would work in less taxing applications, who knows.
Replaced the battery in my key fob about 5 months ago. Started having intermittent issues with the key about a month later. The car frequently said the key wasn't there. It wouldn't open or close the locks unless I took it out of my purse and held it near the door. At other times, I couldn't start the car. Sometimes, it would tell me the key wasn't in the car when I turned the engine off. It wasn't consistent and it started to happen more and more. The good thing is that I never got stuck.
Finally, I called the dealership and made an appointment. Had to drive 50min each way and sat there for about 90 minutes. My service person told me that the tech's response when he opened the fob is that, "It's the wrong battery." They put in their OEM battery. Tested it over and over again and couldn't find anything wrong. Paperwork said that the battery isn't "strong" enough. It says it's 3V, but it tested at 2.8.
Updated 1/8/2018: I purchased this item 9 months ago for my Pokemon Go Plus. The battery that originally came inside the watch was a random Japanese brand that died within 2 weeks, so I purchased this pack as I thought if I had to replace the batteries every couple weeks I don't want to spend a ton. Well... I used literally ONE battery from this pack since I purchased it. ONE. That single battery has lasted 9 months now despite using my Pokemon Go Plus for anywhere from two to four hours DAILY. That first battery is still in my Pokemon Go Plus right now and it's still going strong. I'm super happy with this purchase and I totally underestimated the quality of these batteries. If you're buying this for Pokemon Go you're going to have WAY more batteries than you need so prepare to share!
They work fine for some applications like my luggage scale. I had trouble when using with my Toyota Avalon Automatic Key. I kept getting the message that the "Battery Key Needs Replacing" on my in dash message board. When I replaced it a second time I got the same message. It did work but I can't have that kind of problem. The trunk for example did not recognize me as being near the vehicle. But when I punched the button on the Automatic Key it worked! I finally replaced it with an "EverReady" and did not have that problem so far. I am guessing that the Keyco Batteries are not charged at a high enough level or they just lose their charge more quickly.
Although delivery of these batteries was very quick, as advertised, the batteries themselves are absolutely worthless. I automatically test every battery i use/install in any of my devices (i have a long history in electronics), three of this group of 10 did test at about 3.25V when removed from the package; the other 7 tested at ZERO V! When i placed each of the three batteries that tested to specification into my Craftsman garage door opener remote and tried to open my garage, they simple did not work! I immediately tested each of the three that showed proper voltage when removed from their original package, they then showed ZERO V, also. This means that these batteries are so weak/defective that they cannot tolerate any load being placed on them. So, ten failures out of ten! Shame on the seller to ship such products!
I was looking for batteries to fit our Apple TV Remote and our Hamilton Beach Food Scale. I have ALWAYS had great results with Japanese battery companies. When I saw KEYCO by Fast Batts at a great price, I immediately clicked on it! I love the blister packaging. You can seperate each battery from the strip along the serrations without tools. You can pop each cell out the pre cut slit or by peeling off the blister without injury! :-) Fast Batts is Clicking Away & Weighs Up with Fast Shipping! :-) In Stock!
The absolute worse batteries ever. I bought these for the keyless entry to my car and I have to put a new one of these batteries in my primary and secondary key every 2 weeks!!! These batteries should last at least a year+!! DO NOT BUY THESE BATTERIES!!!