Re: [NTLK] e-Mate Hell UPDATE

From: speedy2 (speedy2_at_dag.net)
Date: Mon Feb 04 2002 - 21:51:21 EST


On Mon, 4 Feb 2002, Stephanie Maks wrote:

>
> The eMate monitors battery voltage. That is how it knows when the batteries
> are full. It does high current rapid charging until the batteries reach
> their maximum level, then the eMate goes into low current 'trickle-charging'
> mode.
>
> The thermistor is a safety cutoff feature. That is, if the batteries are on
> their way to meltdown, the eMate will stop the charging current rather than
> turn itself into a molten blob.

I'm not sure how the eMate / Newton handle charging, I think Stephanie is
correct in that the voltage is used as primary cut-off, but in many
battery charging systems, the *temperature* is used as the primary
cut-off. Well delta temperature.

Temperature is actually a very accurate indicator of when the batteries
are done charging, many cordless drills and laptop batteries include a
thermistor and the chargers sometimes use temperature first and voltage
second.

Just an FYI.

Thanks,
Speedy2.

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