Kurtmeyer,
I install charging system to all my tanks and customer's, I designed it and make them myself. go to my website and check the price and details. it not only kill the pain of charging also it prevent your finger touch the paint job. the oil on your hand will etch the paint job. it will isolate the battery form dmd and mf, so no curret will goto dmd while charging. it is also plug and charge, no switch involved. but you have to marke what battery inside the tank somewhere, it is dangerious if you use nicd charger charge nimh.
but be patient after you order it because this is garage made and not always ready for shipping. also I will charge higher postage because I have to send them trackable for protection of myself.

please ignore this post if this sound like trying to sell. not really, those small things wont make me rich. delete this post if moderator find this unsuitable for this forum.