Procraft 20/4 Cordless battery 20V Li-ion, 4000mAh

The battery has an optimal capacity. From the 20-volt battery range, this battery has the most optimal capacity of 4 amp-hours, which lets you work for a long time without the weight of the battery itself significantly burdening lighter tools, yet still allows for a sufficiently long runtime for large tools like hammer drills and saws. An important feature of the 20-volt batteries is the integrated charge indicator. You don't have to connect the battery to a device every time to see if it's charged. Just press the button and the indicator light shows the current charge level, from 100% down to 25%. The batteries contain a charge/discharge control unit that monitors the voltage and current charge level. The use of high-capacity cells also means only 2 rows of batteries are needed, which significantly reduces heat and extends the runtime compared to batteries with 3 rows.