Gentlemen, I have a quick question regarding the little cheap solar garden lights. I have one that came with a AA nimh 150mah battery. I measured the charging circuit current output to be only 20ma. What would happen if I put a 600mah battery (same size, same voltage, same chemistry-nimh) in place of the 150mah one? Or maybe my question I should be asking is how to increase the charging circuit output to match the 600mah battery?