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It depends on how fast you want to charge and that depends as well on how much you take out of the batteries as the less you take out the quicker they charge and the longer they last. At 1C on a 5000mah 6S you will need 150W per battery (5A X 25V plus some headroom). The ichargers are good. Big 12V batteries are available for free through the forum and can be useful to give lots of amps cheaply. They can be recharged with cheap psus and your lipo charger. I do the bulk of my charging at home and finish off at the field. I charge at 2C and each battery takes 30mins max or 15mins if precharged to 4V a cell. Look at posts on parallel charging if you want to charge all your batteries before going to the field. I use 3S 2200mah batteries and field charging is ok, but 5000mah 6S needs 4 times as much and batteries get a bit impractical.
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