This product would be ideal for portable electronics, such as e-readers or portable gaming devices, due to its small size and high capacity, allowing for extended battery life.
802540 3.7v 680mah 600mah 1PCS
Sony Walkman NWZ A/S MP3 Player Battery - 3.7V 900mAh LIS1374HNPA 383450
5 pcs 3.7V 680mAh 1S LiPo Battery Set with Molex Plug & Charger for RC Toys
SONY AA/LR6/14500 VR2 Tabbed Li-Ion Rechargeable Battery: Sonicare - 3.7V 680mAh
Big Foot Heat Lipo Battery for AEP 680mAh 7.4v 20c
Eophmi USB Battery Pack for Led Lights,1pcs 3X1.5V AA Battery Case,Batteries Case Box with USB Port for 4.5V Led Lights, String Light, Fairy Light, DIY Decorations