Finally taking the LiPo leap.

[notnodak]

I haven't run for a few months and when we out the other day my battereis sucked A$$. runtime was crap and power was barely there. They had frozen a few times and over heated manytimes. I run a 3905 E-Maxx with a Fiego 9xl/MM esc and generic UBEC 6v. I borrowed my friends single 2 cell 4000mah Li-Po and wow, it had just as much power as my 14cell Tenergy 3800 on their best day. I'm convinced that running two 2cell LiPo's would make my system run cooler and overall much much better(to it's potential). I was sold right then and there.
I'm ordering 4 Turnigy 5000mAh 2S 20C Lipo packs but I need help on the charger and what adapters I need to charge two or all four packs at once. I was looking at getting two of these chargers http://www.hobbycity.com/hobbycity/s...idproduct=2055 or just one of these two choices http://www.hobbycity.com/hobbycity/s...idproduct=5548 http://www.hobbycity.com/hobbycity/s...idproduct=5606 with these adapters http://www.hobbycity.com/hobbycity/s...idproduct=7444. I also plan on getting a new 4x4 slash and running 3-cell but want the charger to do both types well.

Any input would help