Dude the Orion 3800Mah is $114 from tower. I just bought a 6500HV 30C From maxamps for $107 shipped to my door. I know the 3800Mah is a hard case and the MaxAmps I ordered isn't (my choice, still could have gotten a hard case which is $149) The Orion 5000Mah 20C HC is $129, I'd pay the extra $20 for another 1500mah any day. I'm sure you can always find "deals" but these are price I pulled from Tower Hobbies(Orion) and Maxamps(Duh maxamps)

I feel that the performance of the maxamps batteries are great, I hate when people post false information on here to someone looking for help. EDIT: I'm not one to start a "POST WAR" and I don't want to. I know I'm coming off a bit rude, but it's not my intention, I just want to provide accurate info...unbias info.

I have a Slash, and I would recommend ANY BRAND 2S 7.4V Lipo for your boys. Lipos are IMO much easier to charge. There's no guess work about what amperage to charge at. For a 6000mah your charge at 6amps, 3800mah-3.8amps, 6500mah-6.5amps.... get the picture? The charger will take care of the rest.

As for Lipos on the Slash, I ran my 6000Mah MaxAmps Lipo (haven't use the the 6500 yet) and after about 20min of crazy driving I only used 2130MAH out of the battery.

Jay