USB output port 5V--2.1A, MAX2.4A, can be used as a power bank. USB output function will be enabled only if you cut off the power and insert the battery; power bank does not apply to Ni-MH batteries.
TrustFire TR020 4-Slot Li-ion Batteries 3.7V Rechargeable Battery Chargers USB
4 Slots 21750 21700 Battery Charger,SUNLYTOUR 4 Slots Ni-MH AA 18650 Battery Charger 21700 Charger for 20700 22700 22650 26650 26700 16340 (RCR123) Rechargeable Battery with PCB Protection Board
USB Rechargeable Charger Station for AA AAA NiMH NiCD Cells, Fast Charging with 4 6 8 Slots, For Smart LED Indicator, Heat Dissipation, Short Circuit(4 Slots)
4 PCS 18650 Battery Holder, KUOQIY 4 x 3.7V 18650 Battery Holder Case with Pin, with 2 PCS Plastic Battery Storage Box & Screwdrivers & Screws (4 Slots)
GTIWUNG 18650 Battery Case Holder with Lead Wire Bundle, 8 Pcs 1/2/3/4 x 3.7V Series DIY Battery Storage Boxes, 1/2/3/4 Slots Black Plastic Batteries Case with Pin + 5Pcs Cable Straps
GTIWUNG 18650 Battery Case Holder with Lead Wire Bundle, 6 Pcs 4 x 3.7 V DIY Battery Storage Boxes, 4 Slots Black Plastic Batteries Case with Pin + 6Pcs Cable Straps