Amazon.com: USB 14250 Lithium ion Rechargeable Battery, High Capacity 3.7V 300mAh 1/2 AA Size Rechargeable Can Replace 3.6 Volt LS14250 ER14250 CR14250 Batteries, Fast Charge with Type C Port Cable, 4-Pack :
Ni-MH 3A 7.2V 800mAh SM Plug Battery Pack-6 Pcs a Pack