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.

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  1. bisco

    bisco cookie crumbler

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    he starts the mods at 5:50
     
    #41 bisco, May 25, 2026 at 5:49 PM
  2. Georgina Rudkus

    Georgina Rudkus Senior Member

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    I now remember seeing that video.

    I would still get rid of the charging lock out and the charging receptacle and simply use the P3648 charger.
     
    #42 Georgina Rudkus, May 25, 2026 at 5:51 PM
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  3. bisco

    bisco cookie crumbler

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    the dc house and eco worthy are exactly the same size. must be the same mfg, or they are made to the same spec.
    dc house is listed as a bit longer because of the brackets he cuts off. one less thing to do with the eco worthy.
     
    #43 bisco, May 25, 2026 at 5:55 PM
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  4. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Exactly
     
    #44 Georgina Rudkus, May 25, 2026 at 5:57 PM
  5. bisco

    bisco cookie crumbler

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    I just saw your earlier post on the company and size :cool:

    he uses reducing studs from M8 to M6 because of the eyelet size, an elegant solution
     
    #45 bisco, May 25, 2026 at 6:01 PM
  6. ChapmanF

    ChapmanF Senior Member

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    The only difference seems to be the ?start=354 at the end of bisco's link.

    Shouldn't that just be ?t=354

    If I remember right, youtube will also accept the slightly more human-readable form ?t=5m54s
     
    #46 ChapmanF, May 25, 2026 at 6:08 PM
  7. Georgina Rudkus

    Georgina Rudkus Senior Member

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    The better solution is to enlarge the hole to 8mm with a round file. The soft copper lug is easy to enlarge,

    More connections mean more chances to fail due to heating form increased resistance.

    The adapter might bottom out and also cause a loose connection.
     
    #47 Georgina Rudkus, May 25, 2026 at 7:10 PM
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  8. bisco

    bisco cookie crumbler

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    All cleaned up and modded, awaiting battery tomorrow IMG_0584.jpeg
     
    #48 bisco, May 27, 2026 at 3:22 PM
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  9. Georgina Rudkus

    Georgina Rudkus Senior Member

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    When I got to that point, I taped a sandwich bag over the blue and white connectors and hosed off all the dirt.

    You will be fine as long as you wait a couple of days for everything to dry out.
     
    #49 Georgina Rudkus, May 27, 2026 at 4:34 PM
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  10. bisco

    bisco cookie crumbler

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    I actually already vacuumed everything out, so 'ill hose off the dirt with that protection, thank you.
     
    #50 bisco, May 27, 2026 at 5:22 PM
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  11. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Also put the little white connector for the controller charger lock out in the bag.
     
    #51 Georgina Rudkus, May 27, 2026 at 5:31 PM
  12. bisco

    bisco cookie crumbler

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    should I leave the battery fully charged from week to week, and what about overwintering? it is in an unheated barn, and we can get some sub zero temps which will bring the temp down into the teens at times.
     
    #52 bisco, May 27, 2026 at 5:49 PM
  13. Georgina Rudkus

    Georgina Rudkus Senior Member

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    The battery comes with a guide.

    I charge it up to 100% and use the mower until the charge goes down to 50% before recharging. You can safely go down to also low as 30%.

    Over the winter long term storage should be at about 70%.

    You should keep the battery above freezing over the winter. If you put the mower in a barn with lower temperatures, I run an extension cord out there with a small safe space heater like one of those oil filled radiator types.
     
    #53 Georgina Rudkus, May 27, 2026 at 6:05 PM
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  14. bisco

    bisco cookie crumbler

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    thank you. the barn is too big for that, maybe I can put a cover over it with a small thermostatically controlled resistance heater under the deck.
    hard to believe most people buying tractors with lithium standard thinks about these things
     
    #54 bisco, May 27, 2026 at 8:54 PM
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  15. Trollbait

    Trollbait It's a D&D thing

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    How cold does it get in your barn? Some sources are saying LFP can handle down to 14F for storage; others -4F. At those points I'm guessing is when physical freezing of the electrolyte is an issue. Above that, and the risk is more from charging and using the battery in the cold.

    If you really do need heating during storage, look into heating mats for starter batteries. You'll want to install it while doing the conversion. More work, yeah, but it means no messing with covers and space heaters; just plug it in.
     
    #55 Trollbait, May 28, 2026 at 10:55 AM
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  16. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Good idea.

    Easier is a $35 300 watt thermosttatically magnetic oil pan heater sold on Amazon.

    The battery's case is steel, the the magnet will stick on it fine.

    It would be easy to place and remove without tools through the plastic access panel under the seat.
     
    #56 Georgina Rudkus, May 28, 2026 at 11:03 AM
    Last edited: May 28, 2026 at 12:03 PM
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  17. bisco

    bisco cookie crumbler

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    generally, it doesn't go below freezing. I'm not around to check it, but a prolonged spell of single digits could drop it pretty fast. it's only studs and plywood.
    I'll look at mats, thank you!
     
    #57 bisco, May 28, 2026 at 1:39 PM
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