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Hey Guys,
Well this past week I took my Impulse 31 out to the family cottage and suffered a small mishap. Despite running 3-4 times a day in the 100+ degree heat last week with no issues, my 2nd run there resulted in one of my new Dynamite 5100 6 cell packs splitting the shrink wrap over both the outer wrap and the inner covering the batteries. The batteries are usually pretty warm after a run (no temp gun to verify), but hadn't split any shrink before. The very next run (after ensuring there was no shaft binding) both of my 4500 packs also split both layers of shrink. Again, none of the batteries seemed much warmer than normal, though they were in the boat slightly longer due to the distance from my pit area to my running location.
Any idea what could have caused this? The boat was running with the M445 on it when the 5100 split and the 4500s split with the stock prop. I had cooling flow to the motor and ESC the whole time (neither were warm to the touch and the connectors weren't even warm compared to a normal run). The biggest difference in running at this location compared to others is that I had to do a bit more starting and stopping to clear weeds from the rudder and turn fins, but the prop never got fouled and the electronics all stayed cool. Runs were under 10 minutes (probably closer to the 5-6 minute range) and all batteries were checking out at about 7.24-7.28 volts on my Onyx 245 after the splits. None of the cells were shorted out (verified by an uncle who is an electrician and was puzzled by the splitting/battery heat but impressed with the boat nevertheless). Is this normal with certain packs or could it just be a bad batch? In a test run afterwords (with high grade electrical tape repairing the battery), the boat ran as normal and the heat stayed down using the stock prop. All packs were less than 2 weeks old.
I know most everyone here uses LiPOs, but if anyone can think back to the good ole NiMH days and help me out I'd appreciate it!
Well this past week I took my Impulse 31 out to the family cottage and suffered a small mishap. Despite running 3-4 times a day in the 100+ degree heat last week with no issues, my 2nd run there resulted in one of my new Dynamite 5100 6 cell packs splitting the shrink wrap over both the outer wrap and the inner covering the batteries. The batteries are usually pretty warm after a run (no temp gun to verify), but hadn't split any shrink before. The very next run (after ensuring there was no shaft binding) both of my 4500 packs also split both layers of shrink. Again, none of the batteries seemed much warmer than normal, though they were in the boat slightly longer due to the distance from my pit area to my running location.
Any idea what could have caused this? The boat was running with the M445 on it when the 5100 split and the 4500s split with the stock prop. I had cooling flow to the motor and ESC the whole time (neither were warm to the touch and the connectors weren't even warm compared to a normal run). The biggest difference in running at this location compared to others is that I had to do a bit more starting and stopping to clear weeds from the rudder and turn fins, but the prop never got fouled and the electronics all stayed cool. Runs were under 10 minutes (probably closer to the 5-6 minute range) and all batteries were checking out at about 7.24-7.28 volts on my Onyx 245 after the splits. None of the cells were shorted out (verified by an uncle who is an electrician and was puzzled by the splitting/battery heat but impressed with the boat nevertheless). Is this normal with certain packs or could it just be a bad batch? In a test run afterwords (with high grade electrical tape repairing the battery), the boat ran as normal and the heat stayed down using the stock prop. All packs were less than 2 weeks old.
I know most everyone here uses LiPOs, but if anyone can think back to the good ole NiMH days and help me out I'd appreciate it!
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