These are rechargeable EH brand LiMn (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. They can be charged with any Li-Ion battery charger with an output of 4.2V. These are flat top batteries. They are 3.7V batteries that are rated for 1100mAh. Battery cover may vary but the batteries are always high quality and accurately rated. Price is for one (1) battery.