XINJ 3.7V 4000mAh Li-Po Polymer Battery (14.8Wh) For Tablet, GPS, PDA – 3766125 Size

If your tablet or GPS device won't hold a charge like it used to, this replacement battery might be the fix.

It's a 3.7V, 4000mAh (14.8Wh) lithium polymer cell from XINJ.

The physical size is roughly 12.5cm x 6.6cm x 0.37cm—so it's a slim, flat pack.

Common in a bunch of tablets, e-readers, and portable devices.

Comes with a 15-month warranty, which is solid for a battery.

Just make sure the dimensions match your old one before you swap it.