Cheap IMR 18350, LiMn 800mAh Battery – $3.41 USA
IMR 18350 Flat Top
Check out this daily deal for a cheap flat top IMR 18350 battery. Pick them up for only $3.41 each, valid all day today 3/3/14.
These are rechargeable EH brand LiMn2O4 (commonly referred to as Lithium Manganese or LiMn) batteries. They are safer chemically than Li-Ion batteries and do not need a protection circuit.
These cells can handle high amperage and are safe in series or in parallel