It's also a bit because back when NiCd were standard many tools had 'C' sized cells so the power/capacity *was* directly related to the voltage. So, for example, a 12v tool had 8 x C cells and an 18v one had 12 x C cells.
Get someone to explain the concept of gearing to you one day...
The same applies now - most LiIon packs are made up from a common cell size, so more volts means higher energy density, and hence longer run time or higher performance.
replying to CM, Brian wrote: I now have the same problem (lost charger). The pictures of the original psu for the KC9036 show the output as 5VAC. I can't see one available anywhere. Will a 5VDC charger work?
unlikely. Typically to replace a 5v ac supply you'd need 7v dc.
NT
Can I assume that there is a rectifier circuit in the screwdriver and that the dc (7v) charger will work ?
pretty much. Can't guarantee it will though.
Thanks, I'll have a give it a go!
center pin positive and outer negative. I used a multi-selection charger as the original one has failed.
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