A good quality Unitek 22500 flat top battery.
UNITEK 14430 4/5AA Li-Ion Flat Top Rechargeable Battery - 3.7V 750mAh
XTAR VC4 PLUS Battery Charger,included QC3.0 adapter charge Liion and Ni-MH battery at the same time 3A Fast Charger, 4 Bay Rechargeable Battery Charger (VC4 PLUS+ UK Adapter)
18650 Battery Charger 8 slot XTAR VC8 PLUS 3A Fast 21700 battery charger for 3.6V Liion and 1.2V AA C Batteries with UK plug in adapter
Huina CY1501 Scania 770 LiIon Battery 7.4v 1200mAh
Huina 1593 & 1575 1200mAh 7.4v LiIon Battery
Lenovo Internal, 3c, 50Wh, LiIon, SMP, FRU02DL009
