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I had the same prob as you and was very concerned that the batteries in the SE were just worthless and I'd have to figure out how to get new batts. That all changed when I started using an old peak charger that I had to charge them. Now my stock batts give me about 7-10 mins on my stock SE chassis and about 15-20 on my stock ZZ chassis. On my Micro_amps mosfet modded SE chassis I can get anywhere between 10-20 min. I am running the 34,000 NX motor with the red gears on that one. The runtimes variation depends at what amps I charge them at. .1 amps takes longer to charge but gives the most runtime whereas .5 amps only takes about 7 minutes to charge but I get the least runtime.
My advice to you right now would be to do as Kanegs suggested earlier and double, triple and at most quadruple charge your car with the stock setup and new triple As. If you have the opportunity to do one of the many charger mods listed in the forum, I'm sure you will get drastic results in terms of runtime.
I don't know of anyone that has successfully added another battery pack or cell, nor do I know of anyone that has done a Li-Poly on the SE. The chassis setup doesn't have that much space. (The only person I heard of was bdebde) If you did more cells without the mosfet mod, do it in parallel for runtime, since the pcb limits the volts that gets to the motor negating any effect a series connection would give.
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