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Charge a 6V battery with a 12V charger?
I'm going to buy a small (around 4Ahr) 6V sealed gel battery to power my Pentax K100D when I'm away from AC mains. Those 4 AAs just don't hold enough juice to drive many long exposures. I've read in a camera forum that a fully charged battery (7.2V) with series protection diode (-0.7V) will deliver the 6.5V the Pentax loves.
Now, how to charge it? I am planning to get a 6V charger, but before I spend the $s, I wonder if I can use the el-cheapo 12V charger (240V mains input) that I use to charge my 12V batteries? Could I do something as simple as run the output through a voltage regulator - say a +8V, 1amp regulator? Fit a reasonable size heatsink? Reckon it would work? Or will I just make a mess of the charger?
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