If, as I suspect, the charger is the default Sanyo 4 battery charger like this one
] it can only charge 2 or 4 batteries at a time. You can mix 2AA and 2AAA but it won't charge 1 battery at-a-time according to the instructions that come with it.
Thx! It's a hassle finding chargers that let you do one at a time.
Best SD Deals...
LG 42LK450 42" LCD HDTV 1080p - $188 (Best at time - $699)
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GameStop computer error - 15 minutes of my time to purchase and then immediately "trade-in/sell back" 6 "sale" games in one visit - Netted an $85 gift card w/ no out of pocket cost.