3.7V 5200mAh Rechargeable Batteries Lithium ion Battery with PH2.0/2P Connector for DIY Electronics Products, Toys, Lighting, Bluetooth Equipment...

Bought and tested 3 of these 5200mAh batteries...tested using a ZKE EBC-A10H tester...ran 3 charge / discharge cycles...1 averaged 3800mAh...2nd...4200mAh...and the 3rd met specs...at 5400mAh...Kept the good one, and returned the other 2, since they were around 25% below listed capacity

I love using these lipo batteries for small electronics projects. This is perfectly rated for connecting to a raspberry pi or esp32 board and being able to utilize battery for powering them. I use batteries commonly during development as well as when I get my final iteration done. It's just super easy to handle and then you can go and re-charge the batteries when need be. This battery is 5200mAh which will last quite a long time. Let's take the pi pico W which on average will consume approximate 50mA with the wifi turned on, 5200/50 = 104, so 104 hours or roughly 4 days (yes, I'm taking 1/3 out). If you allow the pi to go to stand by you'll increase this by a large margin, if you push it then it'll be less. Either way, that's pretty outstanding battery life for what you could turn into a nice small rechargeable device. Next up on my list for my pico is to actually add in a usb-c charger for the battery so that I can have the ultimate little portable gadget.

This battery pack has a really high capacity and a standard type connector that is also used in a wide number of devices- in my case a small RC car I've been playing with and looking to upgrade with a better battery. Installing this is just as easy as popping out the old cable/battery pack, sticking this in, and getting on with your day. All told it took me less than a minute, and the upgrade was a HUGE improvement compared to the single 3.7V battery pack I replaced with this. Saying I can get over twice the play time is no exaggeration, since the old battery wasn't really holding a charge well anymore anyway. This is easy to install, widely compatible in all sorts of devices, and gives a really solid charge. In use running it this never got hot, it lasted long, and it is quite sturdy. Whatever you happen to need this kind of pack for, this one is a great choice to consider. I was very happy and I give it a full 5-stars!