ummmm... well i dont really know that much about splitter cables. iv never built one. but id say the best way to go about it is put maybe 2 packs together in parallel, treat it like a 4s lipo and build a splitter cable to suit so it has the 4s balance plug goin to the charger. but i hav no idea about the earth wires u might hav to put them goin to the same terminal. not sure if thatd work or not. hope this has helped.

now i hav a qn for u...

iv just recently gone from 1:18th to 1:10th and iv noticed that compared to micros/minis, the bigger electronics are a real kick in the pills for your wallet. im used to forking out $20 on ebay for an ok lipo but for 10ths its anything over 100. So... i was wondering. i have in the past bought 1500mah 20c 11.1v lipos for my 18ths and been happy with there performance and price. iv been thinking of wiring up 4 of these in series to make them 6000mah and 80c for my 10th. the dimensions of 4 packs together would fit perfectly. however i hav no experience wiring lipos in series and i know that precautions should be taken. should i charge the individual packs separately and then wire them in series on each charge? or somehow rewire the ballance wires and charge it like a single pack on 4c? cheers

oh and btw... i didnt go so over-the-top and bought an imax b5. it can charge 2s lol