Robovac 11+ Battery Replacement

[Carmen Kalua]

Myrobot vacuum is beginning to have to recharge too often and needs a new battery i suspect. There is one available on line at 21 dollars and the alibaba wholesale price is 11 dollars. Perhaps you could stock these batteries and have them available for long time users.

It seems likely that most or all of the early units will be experiencing battery failure to the point of inoperability in the near future. It would behoove Wyze to get ahead of this and offer replacement batteries as an expendable part. A 2 year lifespan on a robovac is unacceptable.

This worked for me and arrived the fastest. I ordered it on Feb 20, it arrived on March 3. (11 days) to transit from China to Syracuse, NY with the standard shipping offer. Quite impressive. I placed a duplicate order in parallel from another seller on e-Bay for the same part, also shipping from China and it was a few dollars more, but it has not arrived yet. (22 days and counting). The promised delivery dates for both were mid-March to the end of April. But AliExpress seems to have their shipping process down and appears to be delivering product much quicker than promised.

If you flip the unit over and remove the main brush, you will see (4) small phillips head screws that hold the battery compartment on. Remove those, remove the cover, unplug the battery, and installation is the reverse of removal.

Robot wants me to replace brushes and filters, but I want a new battery since it now needs to recharge twice to complete the task that used to run on a single charge. So I reached out to Wyze support. No dice:

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.

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.

Replacing the battery is easy. Remove the roller brush cover and you will see 4 small Philips head screws holding a cover down. Remove these screws, lift the cover off, pull the battery out, and disconnect the plug from the vacuum. Installation is the reverse of removal.

Beware the uneducated, Eufy Robovac L70 batteries are protected from tampering (for good reason), but it is possible to replace the Lithium Cells in them! Which is good, as you cannot buy replacement battery packs....

Firstly, please be careful with lithium cells. If you do not know what you are doing, do not try this at home. If things go wrong you might destroy your expensive robot or burn down your house. Having said that, please try to repair all things instead of throwing them away.

So, I received an Eufy Robovac L70 from somebody because the battery was (almost) dead within one year. To the credit of Eufy/Anker, they received a completely new robot vacuum under warranty. To Eufy/Anker's discrete, they received a completely new robot vacuum instead of only a new battery. A new battery can be replaced in under 5 minutes, just loosen 5 screws and pull out the old battery and put in a new battery. So why it is not possible to buy one is a mystery to me and a big f*ck you to the environment.

As I said you cannot find a battery replacement for this vacuum robot anywhere. So, it was time to try to replace the cells of the battery pack. The battery pack contains 8x 18650 cells, with a total capacity of 5.2Ah.

After taking the battery out of the robot and removing the outer heatshrink layer, the 8 cells packed in paper shielding and a PCB covered in foam can be seen. I charged and then fully discharged the pack using an Imax B6AC charger, the remaining capacity was 500mAh instead of 5200mAh. That explained Eufy's unmotivated cleaning....

The connector from the battery pack contains four wires, Plus, minus and two other wires, probably an SMBus/I2C communication bus. So it is probably a smart battery pack containing an TI BQ series IC. Those are notorious for bricking the battery pack if you disconnect the cells from the main PCB. But by keeping the batteries connected at all times, I already fooled a BQ chip once. So let's begin.

Remove all the layers of insulation and foam from the battery. The PCB with a lot of test pads are uncovered. Sadly the parts on the PCB are on the unreachable side. The cells used by the manufacturer are grey INR18650M26 cells from LG. As I really like the Sony VTC5A cells and they have the same capacity, I will use those to replace the old cells.

Solder 30cm wires from the welded tabs (do not solder directly to battery because of the heat) to the convenient corresponding test points on the PCB. Do not forget to also solder a wire from the cell ending in V2+ and the cell ending in V3-, because the batteries are only connected through the PCB here.

Ha, U1 is indeed a BQ40z50 from TI, with a lot of build in protections and SHA1 authentication, so no screwing this up. The chemical Fuse F1 is blown by the BQ chip on the slightest sign of misuse, but it can still be fooled!

I build a new battery pack from the Sony VTC5A cells using my trustworthy Sunko 709A lithium battery spot welder and some nickel strip. Make sure the layout is exactly the same as the old cells and the tabs poke out at the right side. Use the isolation from the old cells or use new pieces and make sure you use paper/plastic isolation circles on the plus side of the lithium cells.

After you have the feeling that the pack is build sturdy enough to make sure no burning Eufy will drive through your home, equalize the old and the new pack to the same voltages. I soldered 1 ohm resistors to all tabs of the old pack and used some crocodile clip test leads to connect them to the new pack. After a few hours, the cells were all at the same voltage. Now the PCB can put on top of the new pack, the tabs cut to size and soldered to the PCB.

Before adding the foam on the PCB and the shrinkwrap, let's try if Eufy accepts the new battery. Reconnect the battery and put Eufy on the charging station, the battery will be charged. This will take longer than Eufy indicates, keep it charging for a few hours.

Found robot specialists, brought the battery, it arrived in a couple of days, took 30 seconds to install. I love simple so much. I love my eufy vacuum cleaner the most, Robot specialists made my life simple again. I absolutely love when something is easy and simple and in Australia.

I was so excited to finally track down a replacement battery for my Eufy 11S Robovac which sat lazy for over a year while I waited for the manufacturers official Australian supplier to have them in stock.

4 cells 37.44Wh Ecovacs ROBOVAC 35C excellent quality battery uses an intelligent control chip, which comes with higher performance and reliability, longer run-time and battery life. Built-in protection circuitry ensures its stability and safety, fast charge but slow power consumption.

4 cells 43.2Wh Ecovacs ROBOVAC 35C excellent quality battery uses an intelligent control chip, which comes with higher performance and reliability, longer run-time and battery life. Built-in protection circuitry ensures its stability and safety, fast charge but slow power consumption.

We specialize in providing high-quality batteries. The Ecovacs ROBOVAC 35C Battery has passed tests according to Security Standards to ensure battery's quality. The interface metal and solid insulators of the Ecovacs ROBOVAC 35C battery are made of Premium materials to ensure stable current input and durability. Round-sealed package ,faster delivery and thoughtful after-sales service will make you feel assured to purchase.

1-Year Warranty

We offer a 12-month warranty to replace the Ecovacs ROBOVAC 35C vacuum cleaner battery! In the meantime, if your battery fails due to quality problems, we will replace it with a new one for free.

100% Security Payment

We focus on the protection of personal privacy information, and we have taken all steps to ensure that your shopping experience is safe and secure, buy Ecovacs ROBOVAC 35C replacement battery with confidence!

The sellers advertising replacement batteries love to use the word 'original' in the title, but in my mind that is a different thing to the word 'genuine'. I am resigned to likely resorting to an aftermarket one but would like to actually get 5200 mAh, decent brand balanced cells, and a charge controller that doesn't catch fire.

This is interesting. My situation was that initially my unit was stopping and returning to the dock half way through the clean-up for a nap, before resuming and completing the cleaning. Then it progressed to just dying mid clean. This is what prompted me to purchase the new battery, I had assumed the two things were related.

However... with the new battery it is still dying after about 20 minutes of cleaning. Docking it causes it to boot up, at which point there is still capacity in the battery and it can be instructed to clean again. I believe there is some sort of resettable fuse blowing.

Consumers should immediately stop using the recalled vacuum/battery and visit the Anker website to determine if you have an affected battery. If you have an affected battery, contact Anker Innovations Ltd. for a free replacement. ks.

Health Canada would like to remind consumers to report any health or safety incidents related to the use of this product or any other consumer product or cosmetic by filling out the Consumer Product Incident Report Form.

3a8082e126