Ryobi Mosfet Burned. Worth Replacing?

Batteries, Chargers, and Battery Management Systems.
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Sunder   100 MW

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Ryobi Mosfet Burned. Worth Replacing?

Post by Sunder » Mar 10 2018 12:51am

Hi All,

Finally took apart a broken Ryobi One+ battery. It burned out while I was using a circular saw to cut through some treated pine (Length ways - 4m long).

The only "Obvious" damage, is this burned Mosfet
20180310_163956.jpg
Does anyone thing it's worth the effort to replace? Or is it likely to have taken out another part with it as it went?

The other alternative is for me to fit an unprotected high C-Rate Hobbyking lipo in the casing, and just take it out every few months to rebalance it.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: Still on grid, but with LTO batteries and 3kw LF inverter...

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

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amberwolf   100 GW

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Re: Ryobi Mosfet Burned. Worth Replacing?

Post by amberwolf » Mar 10 2018 3:09am

Shouldn't hurt to try, though there's always the chance the gate drive circuit was taken out as the FET blew (common enough failure mode).

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Sunder   100 MW

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Posts: 2646
Joined: Sep 06 2011 11:24pm
Location: Sydney, Australia

Re: Ryobi Mosfet Burned. Worth Replacing?

Post by Sunder » Mar 12 2018 2:22am

I guess it wouldn't hurt to try, except that if it's less than a 50/50 chance I'll get a working battery out of it (2 years old and sagging at that), then I don't want to invest the time, I'd rather buy a fresh one.

I never found a decent HK LiPo that would fit (all 1300mAh or smaller - 2200mAhs were less than 5mm too big on one axis).

Inside the Ryobi original battery, there's a frame that holds 5S2P 18650s. I'm tempted to fit 10S1P of LTO 18650s into it. Will only get 1300mAh into it, but it would be great for small jobs that need a lot of power and rapid charging. I can get a 15A charger, and have it recharged in 5 minutes or so. 24v @ 19.5A continuous.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: Still on grid, but with LTO batteries and 3kw LF inverter...

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

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