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[BrianG]

If on a budget, a simple constant-current circuit designed to cut out at 4.2v/cell should be fairly simple to make given the adequate supply voltage (probably rectify straight AC) and you are charging at lowish amps (~3A max). It won't be the most efficient, nor will it get the pack up to full capacity (not doing the CV phase), nor will it be done in an hour, but function always trumps form when on a budget.

Mike, what did the cycle shop say? Were they impressed? Or were they close-minded about the electric aspect? Just curious...