04-05-2021, 11:44 AM | #1 |
Newbie Join Date: Feb 2020 Location: Covelo, CA
Posts: 26
| killing batteries??
One of my scx10ii is killing batteries. I put a fresh all charged up battery in it and go to crawling. It acts normal until you get in a spot that requires some torque or like a bind. When it gets in a difficult spot is kills the battery boom just like that. What is making this happen? All the electronics are still stock that come in a rtr deadbolt. I just went back to a stock 35T motor. Any Ideas? I was thinking short somewhere or esc troubles, so I ordered a new esc but haven't installed it yet. I figured I would ask the experts before I start fixing the wrong thing. I'm sure one of you guys that have been crawling way longer than I have has the answer. Thank You for the help.
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04-05-2021, 11:49 AM | #2 |
I wanna be Dave Join Date: Jan 2016 Location: california under the rock im crawling on
Posts: 4,288
| Re: killing batteries??
what battery are you using it sounds like a nimh battery on a lipo setting
Last edited by ferp420; 04-05-2021 at 11:54 AM. |
04-05-2021, 12:05 PM | #3 |
Newbie Join Date: Feb 2020 Location: Covelo, CA
Posts: 26
| Re: killing batteries??
3s 7.4 Lipo's it will do it to 3 of the same batteries over and over again. When I put the same batteries in other crawlers ill get an hour or two out of them. |
04-05-2021, 02:03 PM | #4 |
Rock Stacker Join Date: Dec 2020 Location: London, Ontario
Posts: 61
| Re: killing batteries??
Does your ESC or motor get hot when you get it into one of these "Battery killing" situations? If you disconnect the mottor from the drivetrain does it feel like any binding is going on or does it spin smoothly? Are you lifted at all? (could have a really bad pinion angle.) |
04-05-2021, 02:06 PM | #5 |
Quarry Creeper Join Date: Oct 2010 Location: So. Cal
Posts: 345
| Re: killing batteries?? 3s lipo is 11.4v are you sure you are charging correctly? explain "killing" the battery. Like instant drain to low voltage cutoff?
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04-05-2021, 04:16 PM | #6 |
I wanna be Dave Join Date: Sep 2011 Location: Douglassville, PA
Posts: 4,225
| Re: killing batteries??
Sounds like voltage sag. Does it kick off LVC under heavy loads? I had a similar issue, turns out my batteries were shot. I'd be crawling and after a short while my truck would stop dead - way before it should have. When I got home, my charger showed I only used 20-40% or so of the battery. Stumped me for a while...one of the guys on here suggested volt sag, so I hooked up a voltage tester on while driving and boom - could see the volts drop under load which triggered the LVC. |
04-05-2021, 05:30 PM | #7 |
Newbie Join Date: Feb 2020 Location: Covelo, CA
Posts: 26
| Re: killing batteries??
So I messed up I meant 2s not 3s. my bad. But to answer AC 49 no the motor does not get hot ever. and it rolls just fine without the motor connected I tried that this afternoon. But that voltage sag is very interesting and I would like to know how you fixed that problem. But I don't think that's it because I can take out the battery and put it in another truck and it will run forever after charging it. I have not tried to take the battery out after it happens and put it in another truck without charging it I will have to try that. I just changed the esc Ill have to keep you guys updated on what happens.
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04-05-2021, 05:36 PM | #8 |
Newbie Join Date: Feb 2020 Location: Covelo, CA
Posts: 26
| Re: killing batteries?? |
04-05-2021, 05:42 PM | #9 | |
Newbie Join Date: Feb 2020 Location: Covelo, CA
Posts: 26
| Re: killing batteries?? Quote:
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04-05-2021, 07:08 PM | #10 |
Rock Stacker Join Date: Dec 2020 Location: London, Ontario
Posts: 61
| Re: killing batteries??
Yea it kinda sounds like voltage sag (Which means the battery resistance should be getting a bit high, if you can test it) but that is fixed with a new battery. If that same battery works in a different truck under the same conditions then perhaps it’s just your ESC which means you should have no issue now that you’ve replaced that. Sent from my iPhone using Tapatalk |
04-06-2021, 09:30 AM | #11 | |
Newbie Join Date: Feb 2020 Location: Covelo, CA
Posts: 26
| Re: killing batteries?? Quote:
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04-07-2021, 08:22 AM | #12 |
Quarry Creeper Join Date: Dec 2013 Location: The Garden State, North of I-80
Posts: 439
| Re: killing batteries??
Find a friend who has a charger that can measure Internal Resistance (IR) as your pack is being charged. Sounds like your battery is getting towards its end of life. If it has high IR readings then that's an indication. As to why that pack works in your other rigs, are the other rigs similar in gearing, size, usage, etc.? Those other rigs could be pulling less amps. |
04-07-2021, 09:39 AM | #13 | |
Newbie Join Date: Feb 2020 Location: Covelo, CA
Posts: 26
| Re: killing batteries?? Quote:
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