BillDeLong
Forum Newbie
- Joined
- Jul 20, 2020
- Threads
- 1
- Messages
- 9
I just want to share my experience with a successful conversion I did to my Ryobi RM300e to Lithium.
My mower is about 18 months old when the stock battery started losing capacity and would no longer mow our 1/3 acre lot on a single charge.
I found the following video extremely useful to do the conversion where the most important tip provided is at 20min into the video where he explains that you need to splice the yellow and red wires for the charger/relay bypass:
I discovered that there were 2 major concerns in that video that need to be addressed:
1) He states that it is necessary to replace the stock battery gauge where it's not compatible with lithium batteries and I have found that it works perfectly fine with the lithium battery I purchased
2) He uses a battery that is overkill and stupid expensive. I used the following article to come up with my own calculation for the proper size battery that I need:
Stock lead acid battery = 50Ah rated for 50% = 25Ah usable capacity
Ryobi states stock battery can mow 1 acre but my yard is only 1/3 acre so I figured I would have plenty of wiggle room with the following 20Ah battery that is designed for electric bikes:
I simply used the included velcro straps to attach the battery to the rear chassis bar and charge/store the battery indoors to significantly extend the life of the battery which is stated as a 10 year battery lifespan!
The battery comes with a charger and 10AWG wiring which was fairly easy to splice solder to the included 8AWG harness that came with the mower. I have confirmed that the 10AWG wiring does not get hot, nor does the battery and the mower is far more powerful than it ever was on the lead acid battery. The battery gauge on the mower shows 2 bars left on the gauge after mowing my full 1/3 acre and the battery meter on the battery itself reads 25% charge remaining.
I couldn't be happier with the conversion and will be happy to post pics if anyone is interested in the doing the same conversion and wants to see my setup which isn't far from the video I posted above.
My mower is about 18 months old when the stock battery started losing capacity and would no longer mow our 1/3 acre lot on a single charge.
I found the following video extremely useful to do the conversion where the most important tip provided is at 20min into the video where he explains that you need to splice the yellow and red wires for the charger/relay bypass:
I discovered that there were 2 major concerns in that video that need to be addressed:
1) He states that it is necessary to replace the stock battery gauge where it's not compatible with lithium batteries and I have found that it works perfectly fine with the lithium battery I purchased
2) He uses a battery that is overkill and stupid expensive. I used the following article to come up with my own calculation for the proper size battery that I need:
Lithium Batteries Deep Cycle
www.blueheronbattery.com
Stock lead acid battery = 50Ah rated for 50% = 25Ah usable capacity
Ryobi states stock battery can mow 1 acre but my yard is only 1/3 acre so I figured I would have plenty of wiggle room with the following 20Ah battery that is designed for electric bikes:
I simply used the included velcro straps to attach the battery to the rear chassis bar and charge/store the battery indoors to significantly extend the life of the battery which is stated as a 10 year battery lifespan!
The battery comes with a charger and 10AWG wiring which was fairly easy to splice solder to the included 8AWG harness that came with the mower. I have confirmed that the 10AWG wiring does not get hot, nor does the battery and the mower is far more powerful than it ever was on the lead acid battery. The battery gauge on the mower shows 2 bars left on the gauge after mowing my full 1/3 acre and the battery meter on the battery itself reads 25% charge remaining.
I couldn't be happier with the conversion and will be happy to post pics if anyone is interested in the doing the same conversion and wants to see my setup which isn't far from the video I posted above.
Last edited: