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99.9% rubbing alcohol worked for me... after some rubbing :-)

I couldn't find isopropyl alcohol locally. You could get this one: http://www.amazon.co.uk/gp/product/B003D8QFR8 40-50w may not be enough, but I don't know. I use a butane soldering iron which is equivalent to about 120w, when on full, with a thick and broad flat tip. The flat tip should...

it may just refuse solder, like nickel-chrome or aluminium...

What kind of soldering iron do you use? You have to be using a strong one with a big tip (part of the reason is that soldering on the battery should be quick). It also good to have a drop of solder on the soldering iron tip, it greatly speeds up the transfer of the heat. And it would be useless...

A piece of 1.35 copper wire, taken from the household mains cable, something like 80p per meter in Wilko. I have been fighting rattling with soft pads between the battery and the frame, and battery and battery holder. After battery fell out, I use velcro strip too. I complained to bmsbattery...

Finished measuring battery capacity at 3-4 amp load, results are 10.2 Ah, 385 Wh. Not very precise, since I use hall sensor based current sensor. I didn't need any new cells, only had to fix connections... Will try to sleep before morning.

A photo of fixes, inspired by dave8h:

yes, that too. But the big blob joins broken tab, this is not very clear on my photo, but that is so. I am soldering all over by your method, will try to reassemble the battery now.

Some things on the battery look strange: How could that small peace break? Why is there solder on a cell?

I have disassembled the battery. I noticed that it smelled sort of burned, but I was not sure. I found some defects around 10-th cell (but not only), see my photos below: This is frustrating... This may have happened this way: some time ago on my way to work the battery fell off on the...

Many thanks to everybody for help! I wouldn't be able to do anything without your advice. I decided to try to fix the battery, and maybe buy a new one if I fail, or other cells go bad, or I need a new bms. I bought four of these: http://www.ebay.co.uk/itm/360939737464 . It will take some time...

would you recommend any particular prismatic cells, and where to get them? And BMS? I am looking for a 36V 10Ah battery.

Does there exist a serviceable version of a battery? By service I mean, that it is straightforward to replace bms or any of the cells... I will look in the direction of the small saddle bag batteries, but this would imply packing a bms and controller too...

This is what my cells look like. I don't think there's anything written on them except this one line:

I see. What will happen if I have 2600mAh and I replace bad cells with 3000mAh?

I am going to try to repair my battery. If it doesn't work, I will buy something decent. I tried to look up 18650 cells on ebay, and got confused. Do I need protected cells? Can I buy "UltraFire 18650 5600mAh" for 10 pounds and mix them with what I have?

Many thanks for the guidance :) Which cells is a good replacement option? And maybe it makes sense the container to something like this?

I ran a discharge test, drawing power from B-. I followed voltages on cells, and looks like 10th cell is lagging behind. Below are my measurements taken at several points in time: * 9 cells at 3.85, 10th at 3.65 * 9 cells at 3.80, 10th at 3.60 * 9 cells at 3.70, 10th at 3.50 * 9 cells at 3.67...

There is no leftover solder joining the connector pins... I'll try to check the cells. I sent a message to bmsbattery, from whom I bought everything, but they didn't reply yet.

Here they are: >0.3 MOhm >0.3 MOhm >0.3 MOhm >0.3 MOhm >0.3 MOhm >0.3 MOhm ~80 KOhm ~56 KOhm >0.3 MOhm >0.3 MOhm