![]() Fact is 390 motors can get hot enough to melt the surrounding hull material on some tanks when voltage and high loads to them goes much past 8.4 for prolonged periods. For the sake of this topic/thread it is irrelevant if it is polystyrene or ABS. But it never hurt to be careful.“Plastic” is a general term I use to describe the hull material. But I will not call that a "high voltage battery". One of the test I plan is to use a 3S Lithium battery (11.1 volt nominal) with a Mabuchi RS-380PH-3270 motor which is rated for up to 15 volts DC. ![]() ABS has very good strength as slightly elevated temperature. HL uses ABS plastic to mold the frame/hull of their RC tanks. But good to know the information you provide about the motor fan material though. Many documented case of the radiant motor heat caused by high voltage battery use melting the surrounding plastic parts of the tanks hull. Thank you.By plastic I meant the hull “plastic” not plastic in the motors. " The only sure way to get a good motor is to test each and every motor purchased before use." I expect low end DC motor to use similar plastic for the fan and closure. But it cannot use low melting temperature plastic, Today, we have microwave tolerant plastic which are quiet cheap and has good temperature capacity. I do not expect cheap DC motor to use high temperature thermoplastic like nylon or polycarbonate. No major difference in the temperature results. I repeated the test on the Leopard with metal track. I did the test on a M26 Pershing 3838 with plastic track first. An one hour test did not draw them down much. The packs are 5 Ah and 6 Ah respectively. Unlike the NiMH, the LiIo does not drop in voltage very fast. Either one meet the RC tank motor need with plenty to spare. Another pack uses Orbtronic cells which are 10A continuous and 15A peak. ![]() ![]() I have one EBL pack with 4A continuous and 8A peak. For most of the test this time, the battery pack was between 7.9-8.0 volts which happened to be at that value. I use a SkyRC iMAX B6 Mini charget which cuts off charging any Lithium battery at 8.2 volts, not 8.4 for longer battery life. I prefer Lithium Ion battery for their high energy density and longer constant voltage period. ![]()
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