Wouldn’t you be tempted by a battery charger, adaptable to all sources (110V, 220V, 12V car plug), ready to receive simultaneously two battery types, and virtually any kind of photo battery?
Delkin Dual Universal Battery Charger does it all. Furthermore, it was designed to receive interface plates for different battery types that, instead of shooting for the maximum compatibility (leading to impossibly complex thingies), shoot for the simpler and cheaper solution.
$54.99 for the charger and $4.99 for eachindividual interface plate. Gee!