Date: Sat, 25 Nov 2000 17:44:42 -0500
From: David VanHorn <[EMAIL PROTECTED]>
Subject: Re: home made rechargeable batteries
>Any 12 volt battery source would do.
Not quite. The L wants 15V ideally, so adding two cells to your lead-acid
pack will get you to 16V, which seems safe. I've tested that here, and I
see no reason to worry.
I've seen various schemes to temporarily "boost" the battery voltage, but
there's no reason not to feed it 16V. Many "12V" chargers can be "tweaked"
to 16V.
>My only worry in making it removable from the battery source (against
>soldering it) is the possibility of switching the terminals. This would
>surely fry the Libretto's charging circuit, if not the whole computer.
Look in the old archives. I tested this, cautiously, on my lab supply.
IIRC, reverse polarity wasn't a problem (no current flow) but I'd either
have to test again, or look it up. It's been a while.
Look in hobby shops. They sell a connector, under various names, which is
an Andeson Powerpole connector. Cheap, high quality, and easy to put on
cables.
All my 12V ham gear uses these (took about $50 worth of connectors, if that
tells you anything), and the L has a special cable that ends in a powerpole
as well. If it fits, it works. :) It's nice being able to interchange all
this stuff through the common connector interface.
Then again, why remove it? A 12V charger isn't going to put any more than
about 14V on the battery (excluding uncle earl's combination charger,
starter booster, and electric fencer) Power-Sonic makes a nice line of
inexpensive chargers that run dual-rate, and plug in like a wall wart.
--
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9
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