[ATTACH type=full" alt="DSC_0135_03.JPG]45083[/ATTACH]

 

this is a old ide cable but same thing black top - and bottom red pos + to the charger.

No, that's not right. The 5v needs to connect across only the weak cell block, not all the way from 0v.

 

Two consecutive contacts in the bms connector, or direct to the two sides of the cell block.

 

Putting 11 cells across if will likely cause destruction or fire in the 5V charger.

 

Playing with batteries is dangerous. If unsure, stop until sure.

No, that's not right. The 5v needs to connect across only the weak cell block, not all the way from 0v.

 

Two consecutive contacts in the bms connector, or direct to the two sides of the cell block.

 

Putting 11 cells across if will likely cause destruction or fire in the 5V charger.

 

Playing with batteries is dangerous. If unsure, stop until sure.

each cell bank is 4.2v so a 5v 500ma charger is all that is needed down the balance cable unplugged to that cell bank.

 

guy does the same thing in this vid to a single cell as out of balance.

https://www.youtube.com/watch?v=DP1-VBNJmsg:589

The phone charge is 5v you can only charge 1s not 11s, SW the charger will blow.

The best option as the OP can't solder or doesn't have the know how is to simply cut the jack plug off, bare the wires and confirm correct polarity and then attach the wires only to #11 cell group directly via some strong magnets and if need be a washer (of about 12mm) as well under each magnet to hold the wire end flat.

 

Personally I think the OP should let someone who knows what they are doing to do the job, the cell group needs close monitoring and checking with a meter to ensure over charge doesn't occur.

Edited December 22, 20214 yr by Nealh

each cell bank is 4.2v so a 5v 500ma charger is all that is needed down the balance cable unplugged to that cell bank.

 

guy does the same thing in this vid to a single cell as out of balance.

https://www.youtube.com/watch?v=DP1-VBNJmsg:589

Forget videos, just think about the battery structure. The black wire in the bms connector is at one end of the whole battery, not one end of the weak cell block. Both ends of the dodgy cell block are red wires in the bms connector, and they are beside each other.

 

This battery contains about the same energy as a cup of petrol. Equivalent level of care is needed or the house could burn down.

The Black wire is B- or 0v when it is used, every other sense port along the JST is a 1s and is accumulative in voltage if the Gnd is left in the B-. Try it for your self using a meter you will see you don't just get up to 4.2v. For single cell charging via the JST one has to place the 5v output wire in to the correlating sense port (in this case #11) and then the Gnd wire goes in to the sense port #10 so the charger only see's 1s /5v or less.

seen this guy on ebay and 100% feedback and will arrange pick up. imo it will be cheaper than what jimmy charges

 

https://www.ebay.co.uk/itm/Ebike-Battery-Diagnostic-Service-/144120491857?var=0&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338268676&toolid=10044&customid=CjwKCAiAtouOBhA6EiwA2nLKH9xUnR_BNJShkRk0eqILHgRcj_SCMWcyyfJawl5WOXlIXYfopkrNNBoCgPoQAvD_BwE#viTabs_0

 

cant do bosch batts tho

The issue is getting hold of six genuine 35e's.

Nearly all good reputable sellers have no stock.

The issue is getting hold of six genuine 35e's.

Nearly all good reputable sellers have no stock.

i know thought had a bright idea to go get some 18650 power banks from b and m and not one left and every sort of power bank was gone and nothing to buy

 

https://ebikebatteries.co.uk/product-category/li-on-lifepo4-cells/samsung/

How much ?

Shortage of cells and jimmy is certainly getting a good price for them at that rate.

How much ?

Shortage of cells and jimmy is certainly getting a good price for them at that rate.

when i got some 3400mah Panasonic cells years ago they was £4.50 each buy 2 and got a free torch lol.

 

where do you check for cells? as so many fake ones out there these days but only need 4 atm.

I now only use Fogstar who sell only genuine sourced cells, but like most sellers supplies are scarce.

So I would buy something like this, use a scissors to cut off the end nub that would charge whatever it’s designed for, and a negative and positive wire should pop out of it?

 

Are they color coded so I know which is which?

So I would buy something like this, use a scissors to cut off the end nub that would charge whatever it’s designed for, and a negative and positive wire should pop out of it?

 

Are they color coded so I know which is which?

the best advice i can give you is send it to someone that knows what they are doing, as even if you raise the voltage of that cell bank the bms stopped charging it for a reason.

 

what has the seller said about this ? as you cant keep using the batt in this state as will just get worse if you keep using it.

 

given the size of the batt and you have no tools or any idea what to do this repair attempt is not for you as you short that thing and could end in a 12ft high fire ball.

This is where the seller bought it

https://www.aliexpress.com/item/4000093945365.html

and he said it is in warranty for 3 months more so has sent them photos of multimeter readings to see if they will replace the battery.

 

Where should I look for someone who can repair it for me? I'm in Ireland,(the 2 links provided already are UK based services).

I googled "battery repair" near my town and shot out a few emails but no joy.

Called the local independent bike repair man who doesn't do battery repairs and said he doesn't think I will find anyone that will do it for me.

What about an auto electrician

There's also guys in the radio controlled fraternity that know this type of technology

This is where the seller bought it

https://www.aliexpress.com/item/4000093945365.html

and he said it is in warranty for 3 months more so has sent them photos of multimeter readings to see if they will replace the battery.

 

Where should I look for someone who can repair it for me? I'm in Ireland,(the 2 links provided already are UK based services).

I googled "battery repair" near my town and shot out a few emails but no joy.

Called the local independent bike repair man who doesn't do battery repairs and said he doesn't think I will find anyone that will do it for me.

if he sys it is still in warranty id not touch it anymore and see what he comes back with to fixing the problem.

Any old phone charger that is 5v will suffice, look carefully at the two wires the 5v/+ wire should have a stripe colour on one of them. But what one should do bare the ends put the probes on them and check for polarity, checking for polarity is one of the very basics with owning a meter. If one doesn't know then one should be asking themselves questions.

This is where the seller bought it

https://www.aliexpress.com/item/4000093945365.html

and he said it is in warranty for 3 months more so has sent them photos of multimeter readings to see if they will replace the battery.

 

Where should I look for someone who can repair it for me? I'm in Ireland,(the 2 links provided already are UK based services).

I googled "battery repair" near my town and shot out a few emails but no joy.

Called the local independent bike repair man who doesn't do battery repairs and said he doesn't think I will find anyone that will do it for me.

While you work out what to do next, check the cell voltage each day, and see if is stable or going down. Might give another clue about what is going on.

While you work out what to do next, check the cell voltage each day, and see if is stable or going down. Might give another clue about what is going on.

 

If mine I would charge balance and leave it to sit to see what occurs as you have said Matthew, if the voltage changes I would then do it again but this time with the BMS sense wires disconnected to rule out an open/faulty bleed resistor.

If the result ended up the same still then one would have to say the cell group is at fault and are either self discharging or just weak with high internal resistance.

Any old phone charger that is 5v will suffice, look carefully at the two wires the 5v/+ wire should have a stripe colour on one of them. But what one should do bare the ends put the probes on them and check for polarity, checking for polarity is one of the very basics with owning a meter. If one doesn't know then one should be asking themselves questions.

 

I didn't know but do now after a quick google

So I should;

1 - Pop into a phone repair store, buy an old charger and strip it

2 - Rip the JST off to expose it (this I am worried about as it's stuck to the component behind it - photo attached in next post again)

3 - Insert the negative wire into the 10th slot of the JST and the positive wire into the 11th slot, to charge the weak 11th series

4 - Test this series with a multimeter as it charges, and also touch it to ensure it's not overheating.

5 - Stop charging when series it reaches 4.16V.

 

 

you cant keep using the batt in this state as will just get worse if you keep using it.

 

Is this true? How bad is it to keep using it? I've been doing about 8km per day on it, making sure it doesn't reach shut down level.

JST seems glued to the green box behind it

JST seems glued to the green box behind it

If it is glue then try applying heat from a hair drier or heat gun to see if the glue is loosened/softened and then gently pry apart.

The White JST's are a very tight snug fit they aren't glued or stuck in, they are a two piece connector the female part is soldered direct to the PCB and the male part with the multi wires simply pushes in. Pry/lever it out gently a bit at a time from each side to remove using the wood or plastic tool, the joint is clear to see where to separate .

Personally if one is baring any wires then they need soldering or a pin from a pin strip added to each end to insert in to the hole. Bare thin wires are too flexible and will bend trying to insert the bared end, likely a fine strand will short against the adjacent one.

Without soldering I would use the magnet/washer method direct on the cell group, then the wires can't short as they are on opposite sides of the battery.

 

You have been warned.

Thanks!

 

I found an old charger that has an output of 4.5-9.6V and 300-600ma, I assume this is no use and I need exactly 5v 500ma?

 

Can anyone link a video showing the magnet/washer method?

 

or solder each wire to a flat washer and use a magnet to attach said washers directly to the cell group to enable a slow charge.

 

So this can be done without soldering? I imagine I will have to buy a magnet like [mention=12956]wheeliepete[/mention] suggested?