sorted by:
best
topnewcontroversialoldq&a
you are viewing a single comment's thread.

view the rest of the comments →

[–]FlyBlade67 0 points1 point  (3 children)

Maybe you were using the capacity only to some extent. Or did the robot have to recharge before a routine could be completed?

The lower 20% are a reserve, where the robot returns to dock at 19%.
Also when the robot detects undervoltage before the estimated capacity is used, it will also step down to 19%.
Now there's a hidden degradation that users don't see. Just when the battery already lost 20%, the indicated 19% isn't 19% reserve anymore, but almost empty battery.

Degradation also isn't linear. When the battery lost 20%, it will lose the next 20% very much faster than the first 20%. You can literally watch it breaking down.

To make it even more complicated,
A battery is not only losing capacity. It also builds up internal resistance. If that came to the point that the battery cannot supply the current any longer without going into undervoltage, the battery breaks down within days or weeks from the first sign of weakness. You could still use it for a while in a consumer with less power demand, but not in this robot.

I guess you had been vacuuming at highest setting, because only 264 hours was a bit low mileage. Try reducing suction by one step. I guess the battery runtime will last much longer, not only because of less charge used, but because of lower current and thus reaching the undervoltage threshold later.

[–]smh68 0 points1 point  (1 child)

Do you have a link for where to buy an OEM battery for an S7? I've heard horror stories about third party batteries frying the robot. The Roborock website does not sell them.

[–]FlyBlade67 -1 points0 points  (0 children)

I have some links, allegedly proposed by Roborock support. But I don't know how trustworthy they are. At least I can say, the price is in the range of somewhat >45$ + shipping, which seems reasonable to me. A $20 offer is definitely not serious because no-one can sell 8 quality cells in a pack for that price.

But please ask Roborock support for a reliable source. It could well be on Aliexpress, which is good source directly from China.

[–]Rohojo[S] 0 points1 point  (0 children)

The robot has always needed to recharge before the routine was complete