You can find them on ebay by searching for "Accucel 6 adaptor" but I made my own by going to the thrift store with the battery connector in hand from the Accucel 6 and compared it to the box of misc chargers in the electronics box. I had to solder a connector from one to the other but it works great. Just make sure you match up the mah and Amps.
- a parallel charge adapter would be 3S @ 4.4A for a 1C charge rate.
- a series charge adaptor would be 6S @ 2.2A for a 1C rate.
so which one is your adaper? if you don't know, wire up the adapter and start a charge set for 3S. If it complains about "over voltage" and stops, it's a series adapter -- change your setting to 6S and drop the voltage.