3.7V 100mAh 401230 Lipo battery Rechargeable Lithium Polymer ion Battery Pack with PH2.0mm JST Connector

Perfect replacement battery

Wish I read the other reviews about polarity.. like others have said, the polarity is wrong for the JST connector. I just burned up two adafruit devices due to this crap -- the point of the JST connector being it can only fit in one way to avoid polarity issues. You can't mess with that with lithium batteries -- they will catch fire!

i got two of these, one each for two halves of a split keyboard. they fit perfectly, and work great. like other reviewers, the batteries i got were in the wrong polarity for my equipment. while it was easy to switch the wires around, it could have been disastrous if i wasn't being careful. please double check the polarity before you plug these in.also, the wires were kind of short, but i was able to work around it, no big deal.

Replaced a similar battery and worked great! I'm about three weeks into using it.

Order two of the same battery size. What was received are similarly marked batteries, but are different sizes. One of these batteries will not work for my project, as the width of the battery compartment is limited.

They SOMEHOW managed to reverse the polarity going into the JST connector which completely defeats the purpose of using one. Almost caused a fire which could've burnt down my house. Requesting a refund, the producer of this is extremely unintelligent to think its a good idea to sell something like this.

This battery is good replacement it works wonderfully and easy to replace

All of the batteries I purchased are wired incorrectly and shorted out my lithium ion chargers!! Do NOT buy these. Returned as soon as I realized what was wrong.