Lithium chargers don’t “peak” they charge to preset voltage levels, a 7.4 volt pack charges to exactly 8.4 volts.
With it’s bilt in 2x2 mosfet H-bridge motor driver working stock electronics will handle a 7.4 volt LiPo packs without a problem however since the motor does draw quite a bit of current if you have excessive binding, for example if your pinion/spur gear alignment is too tight, a LiPo powered motor will draw a lot more current and then easily burn out the mosfets. Also I have run across two Micro-T’s now that had bad mosfets from the factory but still ran ok since the other parallel mosfet was working, in both cases the only indication was that even when the motor and drive train where working perfectly (no binding or excessive drag) the cars still would not wheelie, adding a LiPo to a Micro-T that already had one of two parallel mosfets out would likely make short work of the one remaining good mosfet on that side of the H-bridge.
Quote:
Originally Posted by Cheap_B100ard
ok, ran great for about 20 seconds (1/2 throttle w/ lipo = wot w/ stock nimh). then quit, then ran for about 10 more seconds, then nothing - no response from car, steering/throttle etc. i guess the esc is fried. calling losi
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To me this sounds like there was some sort of binding causing to motor to draw too much current, the first time it quit was the mosfets overheating and burning out one of the two forward P-channel mosfets after cooling for a second the second parallel forward P-channel mosfet recovered but when you started again it only took half as long to overheat and burn it out.
Either way getting Losi to replace the board or car is your best bet, if for some reason they won’t help you could try replacing the mosfets but unfortunately it’s not easy since the Micro-T circuit board uses lead free solder which melts at a higher temperature making it darn hard not to lift the pads.