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Sorry for the delayed answer. I wired a series circuit from the battery side of the main contactor to a single pole switch - from other side to the switch to a 200 ohm 50W resistor and from the other side of the resistor back to the LOAD side of the contactor. Flipping the switch allows the...

Which model mower?

I was figuring 2-3 years. Others have reported longer. Either way - great deal! Even figuring LiFePo replacement you will come out way ahead on that deal compared to anything new.

IIRC from a circuit diagram of the mower - the motor controllers are energized when the main contactor is energized by the "ignition" switch. There is a separate low current control circuit to each controller for traction and mower controllers. On my 54", a precharge resistor circuit energized...

Ouch. I sure hope it isn't the higher voltage as I just converted my 54" Ryobi ZT.

OK - so thanks to those on this thread I have my Ryobi 54" ZT mower up and running on 4 Chins 100Ah LiFePo batteries. The biggest challenge was figuring out that I needed a precharge resistor to keep the battery's BMS from cutting out on the initial surge when the key was turned on. Solved that...

Thanks for the info and encouragement. This mower has a bunch of motors (2 drive and 3 blade). They are all brushless variable speed so no "direct connection" between batteries and motors. The blades are definitely soft start. I assume the drive motors are also. Each motor has its own...

Hi Guys I am deep down a bad rabbit hole trying to convert my 54" Ryobi Mower from SLA to LiFePo. I got the new batteries (Chins 100Ah 12V) Charged them individually, and installed them in the mower. I can confirm the series voltage is about 54V. I turn the key on, get on click out of the...

Thanks - new to all this stuff

OK - almost embarrassed to ask this. I just bought 4 Chins 12V LifePo 100AH batteries. Eventually they will be in series configuration but first I am trying to fully charge each one individually to 100%. Chins says they are shipped mostly discharged. I have a Dakota Lithium charger rated for...

Those ExpertPower batteries look pretty expensive. Is there a reason you like them over some cheaper brands like Chins or AmpereTime? Warranty does look good, I realize. Any other reasons?

About to start the same conversion myself using the same prepackaged batteries (Chins). I am no expert. I plan to individually charge each battery fully with a 12V (nominal) Lifepo charger. Note sure if I am going to bother with the parallel balance. I believe I will be able to use the...

I assume you added 4 x 12V Ampere Times? I am about to do the same thing on my Ryobi 54". Waiting for the parts to arrive. Is your conversion running OK? Any further comments/issues?