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They definitely don't bog down in high grass anymore, that's for sure. Just turned 10" of overgrowth into absolute pulp. I assumed it was because SLA batteries are prone to voltage sag during load changes. More or less in line with your assessment, regardless.

I finally got mine done, fired up with no issues! So glad I waited and didn't monkey with a bypass. ZT480ex Batteries: https://www.amazon.com/dp/B09JNK13YH Charger: https://www.amazon.com/dp/B0BKZ2R94T Installation notes: Batteries. 1. These batteries are a little tall, so do yourself a favor...

That's really interesting, thanks for sharing. I think @Salmon noted there may also be a 300amp rated version of the Chin 48v floating around, or perhaps the last person simply got a more sensitive BMS. Either way, congrats on your success! :)

@kdubbya It might be helpful to list your mower model for future visitors to this thread. I think at least one other person used the same battery and ended up needing a pre-charge bypass. As an aside, I am still waiting for a free weekend to give my conversion a shot. Cautiously optimistic.

@Julie EVD Thanks so much for your update! I've gone ahead and picked up 4 myself, and will heed your advice regarding the plastic guides. Super stoked to get back doing the whole lawn in one go!

Very nice! Am I correct in saying it mounted right on the original tray, or did you have to modify it at all? Congrats and job well done! Edit: nevermind, on first read-through I missed your bullet point on the mounting, my apologies.

Do you happen to know the 'short circuit trip' rating on the Overkill BMS? I couldn't find it easily on their website, but I am the quintessential layperson. I'd be curious to know because that one seems to be unfazed by the issue. I was able to confirm the Overkill is able to reset itself...

I am pretty sure someone also tried a Chins 48v as a drop in, which comes with a 500a peak discharge rating with the same challenges. There's really no telling if that $2000 option would fare any better. I am leaning towards these myself, if I don't just cave and build my own...

I think that would depend on the responsiveness of the BMS, right? seems like it would depend on how long until current is reapplied, but I am just speculating based on observations in the thread. Who knows.. What it doesn't seem to have anything to do with, though, is the rating of the BMS...

I think the successful builds that do not require a precharge circuit inadvertantly employed a BMS with automatic reset after a short circuit is detected. My theory is If your BMS requires a dumb charger to reset itself after a short is detected, you will require a precharge bypass or similar...

Hey there, @RhinocerosBagel May I ask what batteries you ultimately went with, and can you expound a little on the blue/white wire thing? I am intrigued. My biggest apprehension with the upgrade is the inconsistency of the pre-charge bypass requirement. Some people seem to require it and others...