NTLK Some comments...

From: Gruendel, Frank 3837 PPE-WT (Frank.Gruendel@de.heidelberg.com)
Date: Thu Jul 06 2000 - 06:29:33 CDT

Sorry if I sound like a wiseacre, that's not my intention...

>> This is normal. 100% for alcalines means 6 volts,
>> 100% for NiMH's means 4.8 volts.

>NiMH's capacity at full charged about 5.6~5.8V.

Capacity is measured in percent. "V" is the unit for voltage.
>Each cell can be charged from 1.4V to 1.45V.

Each cell *should* be charged from its specified discharge voltage to
to whatever voltage it has when it is fully charged.
The latter is *around* 1.4 volts, but can just as well be 1.35 or 1.48 or
whatever. The actual value depends on battery brand, battery age, ambient
temperature and some other things. This is why all good chargers do *not*
their decision of when to stop charging on the cell's voltage alone.
The discharge voltage is between 1.0 and 1.1 volts. If you'd start
once the voltage gets below the 1.4 volts you mentioned, you'd pretty much
all time. And in some cases never stop as some cells won't get above that
value even when fully charged.

Each cell *can* be charged from 0 volts to the voltage I just mentioned.
Provided you are lucky and it wasn't harmed due to excessive deep discharge.

>1.2V means not the voltage at 100% charged but NiMH's working voltage.

Correct. I thought that was what we were talking about. After all, they
working when your Newton is switched on and you just fired up an application
tells you their capacity?


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