[Caevlist] RYOBI Electric Riding Lawn Mower RM48e battery replacement/upgrade

[Otmar]

A friend used low cost Power Queen 100 AH LiFe batteries. They lack low temp charging protection but otherwise seem good. 
Not sure if the list allows images…

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-Otmar, on mobile device.

> On Jun 13, 2022, at 11:15 AM, pmccabe at alyrica.net wrote:
> 
> RYOBI Electric Riding Lawn Mower RM48e battery replacement/upgrade
> 
> Has anyone replaced their  RYOBI 75Ah (LPC12-75) or 100Ah (LPC12-100) batteries with LiFePO4 equivalents?  Hoping someone could recommend a specific make/retailer etc.
> 
> I’m currently away from the tractor so I’m gaming my options.  One reasonable situation with my batteries (75Ah with 80 hard hours) is one or more of the four is bad and needs replacement.  In this situation I was considering the advisability of a mixed pack!  I know default answer is bad idea.  But cheapness is the mother of potentially functional solutions.  If only one of the SLA batteries is bad I replace it with a LiFePO4 which will have an internal BMS and is charged at 14.2 to 14.6V (assuming the Ryobi charger is near that range, again I’m 3000 mile from it).  I figure a potential worst case is any pack imbalance is bad for the SLA batteries and less so for the LiFePO4 (maybe? Advise!)…you can see I’m bargaining against buying 4 LiFePO4s!  A downside of this is one would probably want to frequently check the capacity of the remaining SLA batteries…which is kind of a nuisance with this mower.  I may be making a good argument for bitting the bullet and replacing all of the damn SLAs. Four new LiFePO4 batteries would make for a great pack if an expensive one.
> 
> So any recommendations on good LiFePO4?  Thanks.
> 
> Patrick McCabe
> 
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