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Cordless Drills Self-discharge & Voltage​

Edit:ShenZhen Dingkangda Technoloy Co., Ltd      Date:Apr 25, 2016

Cordless Drills Self-discharge & Voltage

All rechargeable power tools batteries slowly lose their charge when not in use, but some power tool batteries lose their charge much faster than others. 

For some users, tools batteries with fast self-discharge rates aren't a problem, especially if their cordless tool's see little or no storage. Power tools batteries with a slower self-discharge rate become more important for power tool users who plan to user their cordless tools only occasionally. 

Cordless power tool batteries voltage

Voltage determines how much power a battery can deliver at a given time. Simply, cordless tools with higher voltage are more powerful. 

Rechargeable power tool batteries are usually a cluster of individual cells. The combined voltage of the cells determines the battery's overall voltage; however, different types of batteries (NiCD, NiMH, Li-Ion) have different individual battery cell voltage capacities.

For example, the battery for an 18v cordless drill with a lithium battery would consist of around 5 individual Li-Ion battery cells, because Li-Ion batteries can typically deliver 3.6v-4.2v per cell. Individual cell voltage for NiCd and NiMH batteries are about 1.2v and 1.4-1.6v, respectively. 

Very roughly, and with some overlap, the scale for matching tool voltage to workload is like this:

Light Work:    7v-15v

Medium Work:   12v-18v

Heavy Work:    18v-36v