I use an Imax B6 charger, which has balance and main leads. I got mine for £15 with a PSU built in.

The PSU gave up after a few years (replaced from ebay for a few pounds) and the menu buttons have all fallen off.

But for £15 it does the job of charging! Option to charge up to 5A, but keep the amps low and it'll help look after your batteries.