Gomadic High Capacity Rechargeable External Battery Pack suitable for the Olympus Tough TG-4
Amazon.com: MaxLLTo USB Cable for Olympus Tough TG-4 TG-860 TG-870, Extra Long 5ft USB 2in1 Data SYNC-Charge Charging Cable Cord for Olympus Tough TG 4 TG 860 TG 870 Waterproof Underwater Camera :
Amazon.com: USB DC Battery Charger + Data Sync Cable Cord for Olympus Camera SH-1 SH-2 FE-5030 TG-4 SP-100EE : Electronics
BM 2 LI-92B, LI-90B Batteries and Charger for Olympus Tough TG-6, TG-5 – Big Mike's Electronics
Amazon.com: MaxLLTo USB Cable for Olympus Tough TG-4 TG-860 TG-870, Extra Long 5ft USB 2in1 Data SYNC-Charge Charging Cable Cord for Olympus Tough TG 4 TG 860 TG 870 Waterproof Underwater Camera :
Amazon.com: Multi Battery USB Charger for Ricoh DB-110 Olympus LI-90B, Compatible with Ricoh GR III GR IIIx GR3x WG-6 and Olympus Tough TG-6 TG-5 TG-4 TG-3 TG-2 TG-1 Stylus X-Z2 iHS SP-100 :