hi ,

cordless vacuum not charging ..charging led light not turn on..
check power adaptor ..voltage normal ..

dismantle battery pack ..found 1pc out of5pcs inr18650 2200 mah battery died ..measure got -voltage ..others got voltage..
take out the ng pc for put in 18650 battery charger ..it's not charging..

so may i replace with other capacity inr18650 battery?shope not found inr18650 2200 mah
how about others than inr? like icr ..

thanks..


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Better change in set. The other might be failing too. Unless you test it individually.

Others okay, but not balance since the original is 2200.

I've changed my Electrolux Ergorapido codless vacuum battery cells before. Change in set, use larger capacity. Had been working well till today (nearly 2 years now).

This post has been edited by haturaya: Nov 28 2022, 07:34 PM

Like haturaya said above, better to change as a set. But if cannot, then just change that one cell with something as close to, or slightly larger capacity, and see how it goes.

what happened to your battery cells ? cannot charge too ? or the current drain fast after fully charge ?

BTW...not charging battery can be culprit?

checked circuit board ..not seen any abnormal ..


i just use multimeter to check the voltage only ...
end found 1pc showing -0.25x volt..

changing a set to 2500mah can ? original inr18650 ..can change to icr18650?


i dont have battery welder to tap the connection ...
but i have flux to solder the metal plate to battery terminals ..is the method ok ?


thanks ...

can recommend higher capacity 18650 battery ?
some high price ..some low price ..

thanks ...

You can change the cells to higher capacity. You can solder the connections - clean, flux, and solder fast. I solder mine as I cannot justify using a welder once in a blue moon. Take note soldering will use more physical space.

The only thing you need to find out from the data sheet is what is the discharge current of your existing cell, ie what is the drain current, and than match that with the new cell.

You could also search Youtube for "revive 18650" or "reset CID", and see if you want to try that.

the battery pack look ...
the circuit board has 1 smd fuse which is 12A ..so high?

china 18650 should be very hard to find the datasheet ...

order same brand and capacity from taobao? local cannot find the same 18650 battery

thanks ...


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11A discharge current. Just find something more that that

.seller say suitable ...so order 1pc ..after connect if can charge then change another 4pc..

thanks ..


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Great! Please post back the result, would like to know as I have a lot of battery tools also

ok ok ...
waiting seller to post out ..

after replace 1pc of battery ...

measurement B- (black probe) to others B1,B2,B3,B4 (red probe) and getting measurement as in photo ...
why cannot get 15v ~18.5v ?

my used the wrong measurement points ?

could be others battery also no good or bms board faulty ?

thanks ....


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Can you measure from
(black) to (red)
B- to B1
B1 to B2
B2 to B3
B3 to B4
B4 to B+, or poke red at the battery itself

It should be 3.5 V to 4 V as you are measuring each battery individually. If any voltage is not within this range, check that individual battery. You may have to charge the battery individually to get them all to the same voltage, as a BMS could also be without a Balancing function

hi ...done measurement , result as below ...
(black) to (red)
B- to B1 = 3.56v
B1 to B2 = 3.04v
B2 to B3 = -12.28v
B3 to B4 = 2.99v
B4 to B+ = 3.03v

so based on individual battery measurement ...battery no.3 also faulty ?

thanks ....

update ....

open the 3Rd battery ..measure getting 0.01v ...
measure the rest of the battery individual ..getting voltage 2.9v~3.5v

so 2batterys no good ...need to place order battery to replace ...


thanks ...


update

the battery wont charging ...
wonder can mix the blue colour 18650 ,not sure wat capacity ..with the others original battery pack battery ?

thanks ..

This post has been edited by sgpdsmss: Dec 5 2022, 07:37 PM


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You can try, but I don't think you will get good results unless the blue battery came from a power tool battery pack. If it came from a computer battery pack, usually the discharge current is low, maybe about 3 A continuous only. So when the robot draws 8 A while working, that battery will fail. I hope I'm making sense, been a long day the brain power used up already

the blue battery i think come from solar led light..
i just want to connect, measure voltage , then see can charge by using cordless vacuum charger ..
if everything working then will purchase same type of battery to replace all ...

thanks ...

Okay in this case, try first so you know the result

connected blue battery ..getting voltage as below
(black) to (red)
B- to B1...3.56v
B1 to B2...2.97v
B2 to B3..4.0v
B3 to B4..2.89v
B4 to B+,...2.9v

after connected battery ..the bms board feeling warm ..isn't turing on ?

thanks ..


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When charging the BMS should be warm, as current is flowing. Only when all batteries are charged will the current drop to zero and then also the heat. I can see that the original batteries were discharged down to about 2.9 V but the new batteries you installed are at full charge. Just let it charge and see if all the battery voltages approach about 4 V. If yes, then you are okay

after connected all batterys to board ..it's start warm ..

tried to charge ..but it wont charged ..no led light up ..

could be bms board faulty ...