cameron
RCTalk Basher
Hi guys
So i was driving my truggy on Saturday and it randomly cut out. I thought that i had burnt out the speed controller or something along these lines as there was no way the batteries were below the ESC safe voltage as if they were, then the speed controller reduces the power, allowing you to (i assume) bring the car back . Well i connected a pair of batteries that were flat to test it and it did exactly as expected, it had a flashing light and only allowed for a low amount of power at the wheels. So i assumed there must have been an issue with the batteries (the car runs off two 3s lipo's in series)
Well i remembered this issue just earlier and decided to have a look at the batteries. I tested the voltage of one of the batteries and it was around 12.2v showing it hadn't really been driven much, but the other one was 0v. I figured there may have been a broken connection in the cables so i tried moving them while testing and nothing. I then connected an alarm to the balance lead and it shows there is still plenty of charge left.
So i decided to cut the blue cover off and get to the circuit board to look for a break there. I tested across the positive and negative there and there was still 0v. I also tested the cables to see if they were broken but my multimeter gave a buzzing showing that there is no break in either the positive or negative cables. My question is what is going on? How can i have 0v at the +/- leads but proper voltage at the balance leads? Surely, if one of the connection between the batteries or circuit board were gone, then the alarm would go off when connected to the balance lead? In case it helps, the battery is a turnigy 5000mah 3s 25-35c non nano-tech.
Any help will be appreciated
Thanks
Edit: Also forgot to mention that there has not been any physical damage done to the lipo when it failed, nor does it show any signs of puffing at all. And i wasn't going fast when it broke, i was turning around, i went to accelerate full power and me and my mate heard an odd noise come from the car, followed by it cutting out
So i was driving my truggy on Saturday and it randomly cut out. I thought that i had burnt out the speed controller or something along these lines as there was no way the batteries were below the ESC safe voltage as if they were, then the speed controller reduces the power, allowing you to (i assume) bring the car back . Well i connected a pair of batteries that were flat to test it and it did exactly as expected, it had a flashing light and only allowed for a low amount of power at the wheels. So i assumed there must have been an issue with the batteries (the car runs off two 3s lipo's in series)
Well i remembered this issue just earlier and decided to have a look at the batteries. I tested the voltage of one of the batteries and it was around 12.2v showing it hadn't really been driven much, but the other one was 0v. I figured there may have been a broken connection in the cables so i tried moving them while testing and nothing. I then connected an alarm to the balance lead and it shows there is still plenty of charge left.
So i decided to cut the blue cover off and get to the circuit board to look for a break there. I tested across the positive and negative there and there was still 0v. I also tested the cables to see if they were broken but my multimeter gave a buzzing showing that there is no break in either the positive or negative cables. My question is what is going on? How can i have 0v at the +/- leads but proper voltage at the balance leads? Surely, if one of the connection between the batteries or circuit board were gone, then the alarm would go off when connected to the balance lead? In case it helps, the battery is a turnigy 5000mah 3s 25-35c non nano-tech.
Any help will be appreciated
Thanks
Edit: Also forgot to mention that there has not been any physical damage done to the lipo when it failed, nor does it show any signs of puffing at all. And i wasn't going fast when it broke, i was turning around, i went to accelerate full power and me and my mate heard an odd noise come from the car, followed by it cutting out
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