Er, sorry. Of course, what I *meant* to say was size the zener up to around
7.4 volts, *not* 6.9volts. This will allow the 12 volt battery to come up
high enough to get a full charge.  Your charging system will need to
provide enough  current to satisfy the total of both batterie's currents
added up.

TM

At 08:03 PM 5/6/01 -0700, Tom Messenger wrote:
>How to charge lead acid batteries
>
>A
>simplistic answer is to size the zener up to around 6.9 volts. And test.
>Maybe you'll get lucky... but due to the unequal capacities of the two
>batteries, you will have to charge the 6 volt battery longer than it
>'wants' to get the 12 volt battery charged.

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