[TypeZer0]

i suggest running over to radioshack and grabbing copper braid, it's only a couple bucks. place the braid on top of the solder you wanan remove and take your hot iron and heat the top of the copper braid, the solder underneath will quickly melt and get sucked onto the braid. remove the iron and braid quickly so you don't heat the battery too much. as for the dual cell acting as a single cell, i've encountered this twice in a row on two of my dual cell cars. it seems as though i needed to "jump start" the second battery (it always seems to be the second battery i added on, dunno y) but all i did was charge it up once fully and run the car until the charge wears off completely and charge it again. the second or third time you charge it, the second cell should stop acting as a simple connection for your first battery to send energy through and start giving some juice for your car. either that or try to "jump start" the second battery with a quick (less than a minute) charge at 4.5 or 6 volts and try the procedure i jsut described above. it works for me and i've had no problems since