Super Simple NiCd/NiMH Charger

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eric

Posted: Sun Aug 27, 2006 10:53 am Post subject: Super Simple NiCd/NiMH Charger

Site Admin Joined: 01 Jan 1970 Posts: 311

A few years ago the charging of Nickel Cadmium cells was a
fairly standard procedure. An AA sized NiCd cell used to have
a capacity of 500 or at most 600 mAh. You bought or built a
charger that was rated for that capacity and you could use it
to charge virtually all AA NiCd cells. The capacity of these popular
rechargeable cells has increased enormously, especially
since the advent of Nickel Metal Hydride cells. Nowadays AA
cells are available in any imaginable capacity up to 1800 mAh
(at the time of writing). This is of course a welcome development,
but it also introduces a few problems. When you
already have a charger for 600 mAh cells it is irritating to have
to buy a new charger when you buy some new 1800 mAh
cells. To avoid the need to purchase two or three expensive
chargers, we’ll describe a simple charging process that is suitable
for any NiCd or NiMH cell and which can be built in only
quarter of an hour.
For a safe charging process we choose a charging current of
1/10 the value of the cell capacity, C. Why? At this current the
cell can never be damaged, even if

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