Intermittent Acceleration - ESC Issue?

Esk8 Electronics Guides, Support, & General Questions
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About five months ago, I bought a used DIY electric skateboard. The setup includes an MBoards dual motor ESC, two Flipsky motors (not sure on the exact model, but I believe they’re fairly standard), and a 10S2P MBoards battery.

It had been running smoothly on daily rides until last week, when I suddenly lost all throttle response while accelerating—though braking still worked. I had to push it home. After charging the battery and opening it up, I began testing things. Now, acceleration works only intermittently, while braking continues to function reliably. This issue persists whether one or both motors are connected. When acceleration does work, it only lasts about 10 seconds before cutting out completely. Restarting the board or reconnecting the controller doesn’t restore throttle. Interestingly, if I leave the board off for a few hours, acceleration sometimes returns—temporarily.

It seems like an ESC issue, but I’m not sure how to properly diagnose it or where to begin troubleshooting.

Any guidance or suggestions would be greatly appreciated!

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What remote are you using?

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My bet is bad battery. Sags immediately and motors stop. Explains why regen is still working, probably cell under voltage on a pack with a discharge bms

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My first guess would either be that this is low voltage cutoff, or a loose wire somewhere.

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I think the 10s Mboards dual ESC, is just an EbaY Lingyi.

They use potentiometer in the remote, which of course wear out.

I fixed mine, which developed super Jerky acceleration (brakes were fine) with a squirt of Caig DeOxit F5 fader lube.

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Whatever this is

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Is there any way to test if this is the case?

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Id check the voltage of your battery at the connector using a multimeter

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I’ve checked all the connections that I can. The way the ESC is built, I can’t see the actual connecting point from the motor wires.

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The only wire point I see any issues is one of the green motor wires has worn through the rubber coating, but I taped over it so its not touching anything.

Are there any connections that are commonly loose?

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Okay thanks, I’ll go test it tomorrow.

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That is an ebay Lingyi ESC.

There is a belt drive, and a hub motor version.

Pre Tariff bullshit, they were about 62$.

The yellow connector is an Amass XT60.

Separate it to carefully check battery voltage, but there are open solder joints one can probe too, under the green fishpaper.

A chafed phase wire that shorted out can/will render it worthless.

Sniff test. Burnt electronics have distinct smell.

There are better 10s escs.

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Tested the battery yesterday. Attached is the voltage from the multimeter.

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IMG_57413024×4032 2.83 MB

I think this means it is fine. It definitely holds a charge. I’m thinking the ESC is just shot.

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Well good to know now i guess lol. Thanks for the reply.

Is there any risk of ruining another ESC in using the same battery on a new one?

I’ve got a flipsky esc that I was planning on using for another build but is it worth it to plug it all in just to verify that it is an ESC issue? I’m only concerned that something may happen with the new esc.

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better to test it under load, if you haven’t already

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Update!

I have tested the battery with a brand new ESC and a brand new motor. Same issue happens. I believe this narrows the problem down to the battery. I unfortunately don’t have an extra battery. I’ve been considering purchasing a 12s4p to go with my new Flipsky 7070 motors and Flipsky dual FVESC 6.7. Anyone have any recommendations on where to get cheap batteries??

Also, would it be worth getting a new 10s2p battery? I was planning on converting an MBS mountain board into an eboard with the new flipsky things and a 12s4p, but if I get another 10s battery I should be able to hook up my original board and have 2.

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Have you tried swapping remotes and receivers yet?

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Yes! I got a new remote/receiver when I got my new ESC and the same issue happened. I’ve swapped out literally everything except the battery so I’m pretty convinced thats what the issue is.