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Thanks for the lead on the alternate charge port part number. I guess there is no way to know for sure if it is compatible with the 48ZTR until someone tries it. Does it also have two mechanical variants like the original part (from ordering instructions somewhere, Ryobi asks for a picture of...

Here you go, Kavalliero. This image shows how I modified the charge relay. I "borrowed" the 1-pin connector and blue wire from the charge port and soldered the end of the wire to a 10k resistor. Then I coaxed the red pin out of the 3-pin connector shell by pressing a thin tweezer against the...

Thanks, Kavalliero. I hope by sharing my experience I can save someone else the frustration. I've decided that I am content with not having any sort of charging interlock (leave the charger on the seat), and the temp sensor for the battery is moot now since the new batteries have built-in BMS...

I found my way to this forum while searching for Ryobi SLA battery replacement. After much reading, I decided to jump in with both feet and order some off-the-shelf LiFePO4 batteries on Amazon. Thanks to AMDPower for starting this exchange of information and help, and to the many others who have...