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This is a single unit of 3.7V-2.2ah (2200mAh) Lithium Ion Battery with inbuilt Battery Management System (BMS) which provides it multiple protections as well as ensures enhanced battery performance & life. This type of battery is suitable as a retrofit or replacement for traditional 4V lead acid type batteries used for powering 4V Solar Lanterns, Kits, LED Lanterns and for experiements & science projects. One may use it like any other battery but with the advantage of having a lithium type battery which is portable, durable, easier to install & handle as well as more efficient. It can be charged via 6V solar panels of 5W & above with a suitable charge controller in between. By purchasing charge controller or regulators, one can use it for off grid purposes while trekking, camping or otherwise. If used efficiently & properly, it will deliver upto 1000 cycles during its lifetime. We recommend Solar Universe India Solar Panels & Charge Controllers for best performance of this battery.