I’ve got a pack of ZNTER 1.5V 1250mAh USB rechargeable AA Li-Po batteries a few weeks ago from Banggood. I wanted rechargeable batteries to put on devices that need 1.5 volts (instead of the 1.2 volts that regular NiCd rechargeable batteries). The batteries charge at mediocre speed and on each battery, there is a little red led that goes dark when charging is done:

ZNTER 1.5V 1250mAh USB Rechargeable AA Li-Po Battery charging with YZXstudio ZY1270 Colour TFT Dual USB Power Monitor

Unfortunately, they don’t come up with USB cable or a charger, so you have to use what you’ve already had from other devices (or charge from your own PC). I’ve used a Tronsmart W2PTU wall charger to test it in the above picture (doesn’t show). It was charging at around 1.3W. I am still worried what will happen when a battery discharge completely. I am expecting to see a sudden voltage drop from 1.5V to zero. Time will tell.

UPDATE 2-Jul-2017: When the protection circuit kicks in, the battery appears dead and if it’s connected in series, the device they power stops working if it can’t handle 1.5V less than the nominal. So if a 4-battery device can’t operate with 3×1.5V=4.5V, it stops working.

You can grab them from Banggood:

• ZNTER 1.5v 1250mAh USB Rechargeable AA Li-Po Battery 2pcs (affiliate link)
• ZY1270 Bluetooth Colour TFT USB Power Tester Capacity Table YZXstudio QC2.0 QC3.0 (affiliate link)

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