Even the Battery Storage & Maintenance wiki article recommends keeping Yarbo plugged in and on the charging station between jobs.
I don’t know how restricting the charge to 80% would play with Yarbo’s BMS and balancing. Or if that would somehow impact the warranty. We simply don’t have any information other than what Yarbo provides. I guess time will tell.
It would really depend on snowfall in your area how long Yarbo would sit at 100% SOC in the winter. If you get snow every day, you will likely run every day. Get snow once or twice a month you’ll run a lot less.
Do your Husqvarna and Lubas charge to 100% and wait to mow again?
Unfortunately, modern devices all state ‘100%’ when they are finished charging. But what we don’t know is what is happening behind the scenes. So “100%” on a robot’s display isn’t necessarily truly 100% I don’t know what Husq or Mammotion are doing with their BMS strategy.
Li-Ion batteries don’t like being at a true 100% SOC for extended periods of time. It’s even worse if they are also at a high temperature. Not good for longevity.
For cell balancing, you need to periodically get to 100% SOC and let it sit there for the cell balancing to take place, but it doesn’t need to happen on a daily basis. For ideal battery longevity, a Li-Ion battery should be maintained between around 20% and 80%. So not too low, and not too high. Occasionally dropping below 20 or above 80 is ok. But shouldn’t be every day for the health of the battery. And like I said earlier, heat just makes things worse.
Sometimes just accepting the risk that you could stress or damage the equipment connects the feedback loop that kicks your feelss that little bit higher.
According to work plan history, Yarbo finished mowing the back yard at 22:40. This morning at 09:30 battery showed 80% and app says it’s charging. Current air temp is 71 and it got down to 60 overnight.
It would seem that Yarbo docked and charged (likely to 100%. I was asleep and didn’t see it) and then stopped charging and has now worked off about 20% of the charge setting idle.
Does that seem right?
I ended charge and started charge and SOC is now 82%
Yeah, I noticed that last year too. It depends on what the actual state of charge is and not the fake 100% it tells you. It drops pretty quickly down to the actual SOC when it’s working. Once you see it level off, that’s where it generally was. At least that’s been my observation.
I have also already started to experience a diminished battery capacity. In short, my Yarbo’s BMS needs to be reset.
I have deliberately been watching and observing the behavior to see what happens, and as of right now, my battery’s capacity is down just over 10%.
I’m still curious about it, so I’ll continue to monitor. As long as Yarbo is still able to complete its workplans in a timely fashion, it’s not (yet) disrupting my life to keep observing.
Agreed. Proper lithium battery charging is very well understood these days.
That said, I am currently operating under the assumption that this is a newly introduced bug, because no one reported any loss of capacity during the summer months.
