Robot Vacuum Battery Replacement

Grasping at straws here:

After about 2 years, the battery no longer keeps a charge on one of my vacs (I have 4). Originally, the vac just stopped in the middle of the room without warning. I’ve tried the resetting, removing, etc., but the darn thing would no longer do 1 room (about 100 Sq). So recently, I started the vac at 100%, watched my phone and the mapping.

The first image is the vac at 61% (started at 100%) after 52 ft. The second image is 2 minutes later, but now the vac is at 53% and only done 95 ft.

Total clean time: 5 minutes
Total area cleaned: 95 ft straight

2 questions:

  1. Is there or will there be a replacement battery? I’ve already taken it to a battery place and they are like, um no.
  2. Does the vac have a built in overcharge protection? Based on my experience…no.

Thanks!


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Broke is broke, so if you feel confident in disassembling the vac, you might be able to find a number on the battery.

It should have at least the most basic li-ion charging circuit, that includes overcharge protection. If mine starts acting up I plan to install in-line volt/current monitoring to see what it actually does.

What makes you think not?

2 years of daily (you didn’t say) use and using a large part of the battery capacity each time would be hard on most batteries. Not to mention the high power and heat generated in operation.

The battery is an easy to remove module. I know the manufacture base for this, I’ll send what I find to you.

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Model: WRV200S
Firmware: 1.6.306
Plugin Ver: 2.36.1
Wyze App Ver: v2.38.0 (153)

Here you go! Rosie’s Battery for Vacuum replacement. Hope this helps.
When you find one please post it online for others to read. Thanks! Capt. Rob



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A quick search for INR18650 MH1-4S1P-SC shows AliExpress has a replacement battery. It fits the Xiaomi vac which is the company that makes the Wyze robot vac.
Unfortunately they seem to be the only place to buy one.

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Model: WRV200S
Firmware: 1.6.306
Plugin Ver: 2.36.1
Wyze App Ver: v2.38.0 (153)

Original Battery Inr18650 Ma1-4s1p-sc For Xiaomi Mijia Mi Robot

Yes! The batteries


are inside a plastic box that may be removed and inserted into the Wyze-Vac battery box.

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Thanks for the photos.

“To begin with this (Wyze) vacuum is actually a Xiaomi vacuum-mop P (without the mop attachment or water container but the hardware support is still there) aka a Viomi V3”

Is the information I had found . I searched AliExpress for “Viomi V3 battery” and there are a lot of options, some ship from within the US so that’s nice.

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Thank you!!

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Max size is going to be around 3500mAh (3.5Ah). So you can avoid the ones over-representing their capacity. (Link below for source of legit 18650’s)

Look closely, I noticed some look very similar, but appear to be 4 cells (twice as wide) so it won’t fit, those were also listed as Viomi v3 compatible. The ones that say ‘vacuum-mop P’ are a better match.

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What about the Streamlight 6500 mAh cells on Wish? :sunglasses:

18650batterystore.com is my go to for 18650 cells. I prefer Molicel and Samsung.

After researching counterfeit batteries, I read that weight is a good indicator of battery quality.

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Has anyone actually tried a battery replacement yet?

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I got my robot vacuum as an early adopter. It is used quite often. No sign the battery is less able to hold a charge so no help from me.

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Good gosh, this is happening to mine now too in the past week. I can watch the battery indicator on the app drop a point every 5-6 seconds on medium (standard) suction. Will be sourcing a replacement battery from Ali…

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Let us know if it works. Thx