Its talking about charging more than one pack at once- meaning its better to charge 2 packs wired in series (say, 2x 2s 5000mah = 4s 5000mah) rather than wired in parallel to the charger (say, 2x 2s 5000mah = 2s 10,000mah). This is because both packs wont have exactly the same amount of juice left in them, so trying to charge them up in parallel will result in an over or under charge.
If the charger is rated for 6s and has a decent power output in the 100watts+ region, then that will be fine; just bear in mind most of the ones on hobbycity/hobbyking require a seperate powersupply.
I snagged that turnigy 8150 charger from hobbycity and am pleased to say it is everything I hoped for. Charges up to 8s lipo, and stays cool doing it. I can charge a 6s 5000mAh zippy lipo at 5 amps with no problems. Highly recommended... my 2 cents.
hi all .thanks for your advice guys, lipos are new to me so id be lost without you're advice so thanks all . just one more thing this running 2 packs in parallel, is traxxasbasher right if i had 2 20c 5s 5000mah packs parallel id have 10,000mah but still 20c? i dont get it why not? twice the mah surley 20c x2???? thanks guys this is the only thing im not sure of now and nearly ready to order batts and charger yay bye...