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Thanks again - found the 10 components and they all read in increments of 3.6 (making up 36v) so Looks like I need to just splice the charging leads into output cables and foret about BMS And get saving for new battery ! Thanks again for help - you have taught me loads and given an extra...

Also correct voltages on all 10 balance leads (up to 36v now that battery is somewhat depleted.

Good and bad news Good - battery functioned perfectly all on commute of 15 miles Bad news - it won't charge :( Battery in bits again. 42v are getting to the PCB ( tested underside rather that just the plug) Any guesses ?

I have various hand and wrist issues (not all bike related but biking doesnt help) After trying quite a few bars the best I have found is made by On One bikes (of sheffield) it is called ther Mary bar and is swft back without being full Dutch style If you search google a bit you will find...

just to add - i have looked into this as well and for me the weight/bulk is just far too much using Nicad drill packs (even if you remove cells from packs). Lithium (of any chemisrty) wgives you a better power/weight ratio by some way. a 6ah pack really isnt good for more than a few miles on...

series (S) increases voltage and parralel (P) increases amps so 2 x 18v 3ah batteries in series (2S) would be 36v 3ah and 2 x 18v 3ah batteries in parralell (1s 2p) would be 18v 6ah I think you have 4 packs so you can have 2S 2P which gives 36v and 6ah.

Can't test ride till after 5pm but we gave power to motor and all seems good under no load I'm not convinced the charging is working but hard to tell for sure til I run down battery a bit first to be sure Will be deliriously happy if it all works !

Ok, PCb out cable has been cut and soldered to black cell to PCB And everything out back in the case (not so easy!) All looks good but cannot test till this evening

Thanks - i used an old 8fun power cable so should be fine for 15a I intend to replace bulket connectors and will shorten too. Not quite sure where to mount yet so will leave as is for testing purposes.

Here is finished booster pack (bar a bit if reinforced tape and tidying up)

I think I need to go for the splice trick you mention at this stage unless any other ideas ? If so, and I read your post correctly , I can simply sun a short wire from the ground from cell to ground from PCb , These are right next to each other so I'd solder a jumper wire joining them. Here...

Output voltage zero regardless of switch position I'm afraid The first and last balance leads appear to go directly off and down the side if cell packs for about 6 inches and 1 inch respectively each side I think the shorter goes to first cell and it reads 4.2v

May as well give what else I have left ! Aside from 9pin balance and 2 pin switch I have 4pin connection at pcb made of 2red/2black 2 pin red plug - both read 41.8 2 pin black plug - one reads 39.2 and one 41.8

Ah that's better - still only got the 9 leads but I get sensible answers 4.2 8.4 12.5 16.7 20.9 25.1 29.2 33.4 37.6

To clarify I get 41.8v half way down one yellow and I now get 41.8v on the other when the switch is on. Or 0 when off When on, and I test the underside of the PCB where the two yellows plug into I now also get 41.8v on both . I I switch off then one goes to 0 In short I think this is...

Right, the two yellow wired to the switch have an extension and heat shrink half way down . Here I've been fiddling with the plug and now I get 41.8v on both yellow wires But still nothing out of output at PCb It seems unlikely to me that a cell is messing with the LVC as I get 41.8v...

Double checked balance wires and get same values. I did rechecked using 20 setting for lower values and 200v setting for higher.....same results

Thanks - still just got 41v on one of two yellow pins plugs but if I test the reverse side of PCb then both pins give 41v Does this indicate a dodgy connection between female plug and PCb ?

Ok , bit more info - and thanks so much once again d8veh - without you I'm stuffed ! So the two yellows tested against ground give 0 and 41.8v respectfully The balance wires - only seems to be 9 which go into a single white plug All tested vs ground an on the PCb Black - 0.4 Brown - 0.9 Red-...

I have unplugged the switch and tested the 2 contact points for manual switch directly on the pcb Strangely I am only getting 28v here although still getting 41.4v on main cell wires