The simplest and easiest LiFePO battery conversion for all Ryobi 48 volt lead-acid battery mowers

Discussion in 'Fred's House of Pancakes' started by Georgina Rudkus, May 1, 2026.

  1. Georgina Rudkus

    Georgina Rudkus Senior Member

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    That's a better price than I paid for the exact same battery. I thought the $359 that I paid was and still a good.

    Like buying stocks, I guess you can almost never buy at the lowest price.
     
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  2. bisco

    bisco cookie crumbler

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    thanks!
    according to the technical penguin at 44 minutes,
    I can use the original OP48RM charger. what do you think?
     
  3. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Not a good idea. It has a float feature that with continued use will damage t h e LiFePO4 battery.

    I watched that video, too. As nearly all I could find.

    A P3648 charger will display the battery's voltage and cut off when the battery's charge is full.

    If you do an eBay search, one could be had for about $65.

    The original charger is worth $150 plus used, Mine was the Delta Q charger. The newer version is worth nearly $300.

    Your original charge port and cable is worth $50. I accidentally destroyed mine. That turned out to be good, because it led me to develop a better direct charging cable and system.
     
    #23 Georgina Rudkus, May 24, 2026 at 6:52 PM
    Last edited: May 24, 2026 at 6:57 PM
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  4. bisco

    bisco cookie crumbler

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    perfect, thanks!

    battery ordered, I'll order the charger tomorrow.
     
  5. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Great. I have the easy to install complete set, if and when you want them.

    If you are on the East Coast, like me, the battery will be shipped by FedEx from New Jersey.

    You'll get it in 2-3 days.
     
    #25 Georgina Rudkus, May 24, 2026 at 8:27 PM
    Last edited: May 24, 2026 at 8:33 PM
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  6. bisco

    bisco cookie crumbler

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    thank you. did you do the transaxle fluid while the battery was out?
     
  7. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Yes, I changed it with 75-90 synthetic Super Tech from Walmart.

    It was easy.
     
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  8. bisco

    bisco cookie crumbler

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    thanks, I'll do the same.
     
  9. Georgina Rudkus

    Georgina Rudkus Senior Member

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    This charts explaining charge percentage voltages for LiFePO4 batteries.
     

    Attached Files:

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  10. bisco

    bisco cookie crumbler

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    I just realized I have the rm300e, I hope the eco worth will still fit. I've started dismantling the mower