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You can, but it requires a circuit called a "Boost Converter" to raise the voltage of the battery you are charging off of. To charge, batteries always need a slightly higher voltage that what they are rated to produce. Example: If a battery is rated at 12V, it will require ~14V to charge. Check Wiki for "Boost Converter" and "Joule Thief" (a simple DIY boost circuit).
Posted:Sep 23, 2010
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