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.
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
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- Power Tools Batteries Capacity (run Time)
- Deep Discharge Of Power Tools Battery
- Memory Effect Of Power Tool Batteries
- Nickle Cadmium (NiCd)
- Nickle Metal Hydride (NiMH)
- Lithium Ion (Li-Ion)
- Power Tool Battery Shapes
- Power Tool Battery Chargers
- A Look At Cell Formats
- Battery Cell Formats