EEMB Lithium Polymer Battery 3.7V 1400mAh 112945 Lipo Rechargeable Battery Pack with Wire JST Connector for Speaker and Wireless Device- Confirm Device & Connector Polarity Before Purchase

This battery dimension fits the headlamps I ordered where the battery just wasn't holding a charge as long. I am hoping with almost 50% more battery capacity, I won't have to do this for quite a while. I went ahead and installed the connector (already in there soldering) for when that time comes.

As noted in the product title, beware of the polarity. For some reason, there are two common wiring conventions. Since I've been using a lot of Adafruit boards lately, I needed it wired for "center negative." I tested it right after it arrived and quickly reversed the polarity. No soldering needed — just a male and female JST cable and some solderless connectors like Wagos. Moral of the story: always check polarity before plugging in a LiPo! Once rewired, it charged and worked perfectly with my dev boards.

CHECK POLARITY, CHECK THAT THE RED CABLE GOES TO THE POSITIVE ON WHATEVER YOU CONNECT IT, IF IT DOESN'T YOU CAN FRY YOUR ELECTRONIC OR BATTERY MAY CATCH FIRE will update after I charge and see how well it holds charge

I searched high and low for a higher capacity 1s LiPO that would fit the little battery compartment in this tracker ground station. This one fits perfectly. The connector has pos and minus switched (It's for UAVs which have the opposite polarity). It's easy to change it, do not push down on the metal locking tabs, pry up on the plastic locking tabs, pull the wires out, switch them, push them back in. Perfect.

I am using this battery in a portable Meshtastic ESP32 node. It works exactly as expected.

Fit and working. Like nothing happened

The battery is good, I used it to upgrade my solar lawn light from 500mah to the battery’s capacity so that I can use the light overnight. The battery size is perfect to be hosted in the original battery box.

Was good but couldn’t use it in the end as my bike light was just too shall should have checked the size properly. So didn’t really give it a good test. Decided to get a new bike light in the end that was on offer.

I needed a replacement for my portable cesk lamp and this fitted the bill, quick delivery too.

Lasts much longer than the original battery

I installed this battery in a GPS tracker to replace a similar spec unit. For several months, this battery performed as expected: After charging, I could run the tracker for 3-4 hours per day over 4 days before it dropped to 30% (at which point I recharged). Now, 5 monts on, the last few recharges have resulted in the tracker showing 100%, dropping to 20%, in less than 12 hours. The tracker was inactive over those 12 hours. I can only conclude the battery is near, or at, the end of its useful life. Past batteries have lasted at least twice as long with similar duty cycle.