In article ,
Jim Yanik wrote:
the cheaper cordless tools(like Ryobi) use a plain transformer
charger,not some regulated "smart" charger. And you CAN overcharge your
packs with them.

Very much so if they say something like a four hour charge. At worst, some
have only a series resistor to set the current - even although they
provide a pretty LED to 'show' it's charging. The series resistor idea
isn't quite as bad for a lower charge rate like say overnight - but can
still cause damage through gross overcharging. However, as the cost of
'smart' electronics comes down, some cheap ones are providing it. If only
to cut down on warranty claims.

Some folks use a simple timer to shut off the charger after 8 or 16
hrs,whatever's called for by the particular tool.

the better tools use a one-hour or shorter fast charger.
They also have a temp sensor in the pack,or use an IC to monitor battery
voltage to determine when to stop charging.

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Dave Plowman London SW
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