A pair of good quality, GTF 16650 flat top batteries. Built-in protection circuit (PCM) prevents over charging/discharging.
2pcs Protected LiitoKala 26650 Lii-51S Li-Ion Flat Top Battery - 3.7V
GTF AA/LR6/14500 Tabbed Li-Ion Rechargeable Battery - 3.7V 800mAh
Protected 21700 Battery Charger XTAR New X2 Charger 2-Bay 18650 Charger with AC and USB input LCD Screen for 3.6V/3.7V 14500-26650 Li-ion Batteries 1.2V Ni-MH and Ni-CD Rechargeable Battery
AA AA0725 4A Intelligent Car Battery Charger - LCD,8 Stage, Recover Dead Battery,Up To 4.0 DC Current, Memory/Autostart,Fully Protected From Sparks, Overheating, Reverse Polarity,Short Circuits,Black
TFUFR 18650 Battery Charger 4 Slots, USB Rechargeable Battery Charge for 3.7V Li-ion TR IMR 10440 14500 16650 18650 16340(RCR123) Batteries With LED Display (No Battery)
Spartan Power Battery ON/Off Disconnect Switch 300A - Ignition Protected, Heavy Duty Cutoff Switch for RV, Marine, and Automotive Battery - 12V to 48V - Red