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Thanks for the welcome! I haven't explored building a LiFePO4. I didn't know it was a thing. I was looking at about $150 for three premade 12V 15Ah that fit in . Other than the charger, would building a pack be similar cost?

Thanks for the additional info! I'll read up more on this. Looks interesting

I have a 36-volt Black & Decker mower (CM1936Z) that has a battery pack normally made up of three 12V 14Ah batteries. I replaced the SLA's about 4 years ago with 15Ah's. I understand 4 years is about average for SLA life expectancy. I'm ready to replace again as they are getting weak. This...

I'll try to do that. If the surge current is the issue with the LiFePO4 BMS, would Lithium Ion be a better choice?

No problem with the mower or blade. I do try to keep it sharp. It's just that the lead acid batteries are getting old again and I'm looking into better battery technology.

I'd forgotten the basic fact that any brushed DC motor will draw heavy current for a moment when it is stopped and full voltage is applied. Then, current quickly drops as the motor comes up to speed. In a number of ammeter tests last night, I got instantaneous 60 amps for a split second at...

Very well! Thank you everyone. I'll most likely stick with replacing the SLA's for now to go another 4 years, hopefully. I'll try to get a peak current using these batteries and then again with the new SLA's so I have a worst-case peak current draw for future consideration.

My clamp ammeter is AC only. I've got an AC/DC arriving tomorrow to take the peak current reading. Meanwhile, I see there are some 12V 15 Ah LiFePO4 batteries sold by THISS on Amazon that have a continuous/peak 30/60 amp discharge rate. They even say they are good for push lawn mowers in...