Bosch PSR 2.4V screwdriver cells?

Question

Hi all,

I've just come across my old Bosch electric screwdriver and I remember it being pretty good and torquy. It also has a neat auto locking mechanism if you prefer to use it as an ordinary screwdriver.

Because the supplied charger didn't seem to do anything when (supposedly) left on charge for a while, I've stripped the screwdriver down and have the cells out and on my fancy new charger.

I believe they are Nicads but the (2) cells themselves are in an unmarked cardboard tube, I can't see any mention of the chemistry on the driver itself or anything on the net (the closest was a discussion here a while back ) so I wondered if anyone happened to know please?

I've got them on a gentle(500mA) x3 'cycle' as NiMh's so I'll see how they fare and I don't think the charge profile is that much different from NiMh's in any case ((Negative) Delta V full charge detection) but I understand it's safer to assume NiMh even if they are Nicads when charging.

Cheers, T i m

tabbypurr · Accepted Answer

They're bound to be NiCd. By the time NiMH and lithium came along no-one was still buying 2.4v screwdrivers. NT

T i m · Answer

That was my thought as well.

Were NiMh and Lithium that closely spaced? I thought there was quite a gap where things were gradually going from Nicad to NiMh (with the cheaper tools still coming in NiCad) and then a slow appearance of Lithium with most the mainstream stuff still coming in NiMh (and still with low voltage screwdrivers (in particular))?

Cheers, T i m

Bill Wright · Answer

If they are heavy they are nicads. Bill

T i m · Answer

That's a novel solution Bill. ;-) When I get them off the cycle / charge I'll compare them with my other (known chemistry) cells. Cheers, T i m

tabbypurr · Answer

Laptops were NiMH in the early 90s, power tools stayed NiCd only until more recently, even after most other things had gone NiMH. NT

T i m · Answer

Yeah, that sounds about right. Laptops and phones seemed to lead the way and it was possibly their use that brought the price down for other uses. Cheers, T i m

Bosch PSR 2.4V screwdriver cells?

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