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How are you powering this spot welder, I'm curious?

For me I've kept them in the same groups they came out of the packs in. Then made up the packs of 4, keeping the same make and model together. Prior to that I've individually charged each one and let stand for a day then re measured. Like daves jig though! The mdf may come out this week for one...

Not testing for a bit, once I've done the big pack I'll build some packs of the 18650's. Going to use the dead battery's case and BMS for the 18650's.

All mine are from a job lot of Dell cells, mostly samsung ones, so I've been dismantling packs and being very careful not to rip the strips off, leaving a solderable tab on each end (very sharp though). I reckon I've got enough for 2 36v 9Ah packs. hence me building them in fours, if one block...

My advice would be do small packs. Mine will be built from "blocks" of 4 parallel cells. I'm going to build a 36v 9Ah pack, 10 blocks of these 4 packs. A lot easier to fault find as well. Each block will be soldered tab to tab then the whole thing heatshrinked together with some output leads.

Don't do springs, they're not up to the current. If you're dead set on holders, look for something like this http://www.conrad-electronic.co.uk/medias/global/ce/6000_6999/6500/6510/6513/651327_LB_00_FB.EPS_1000.jpg ps my bms has a temp sensor, which I'll bury in the pack.

My 18650 cells are all the unprotected type, with tabs already on. My plan to solder them is to rough up the tabs, then very quick, high temp soldering. Protection wise I'll be using a BMS for the final pack.

Not got to spot welding yet! Update on the battery, got my charger and following Dave's advice slowly upped the cell count to 6S and managed to get it charged up to that ok (22.2v in about 10 minutes). Cells are still unbalanced after leaving for a bit, so on the Life setting (3.3.v) doing the...

I hope so! Ask me in a week when I'm bandaging my fingers!

They are Li-on, don't worry I'm uber careful. just building a new workshop with fireproof worktops(up to 600c), extinguishers and sand filled fire buckets as well as individual power breakers for each socket. I'm quite new to using lithium so I'm being extra cautious, just got my IR thermometers...

Asked Andrew, their's is about £40, the momentum one is £35 so may as well have the one designed for the pack. But I'm going to see if I put some charge on it first!

Thanks Dave I was thinking along the same lines, I was going to get a 6S balance lead and some recycle a jumper strip off some old server boards, so very similar. If the BMS comes back to life after the initial cahrge I'll probably order the charger from Momentum (the pack producers) to see if...

No components on top, they're just to connect the cells together. No real markings on the cells but the pack is a 36v 9ah one so I'm guessing they're 3.7v 9ah pouches as they're in a 10s1P config. Ordered my Imax yesterday so will give charging a try. Shame my workbenches for the new workshop...

Here's a couple more pictures, not sure if it'll help. I haven't bought an Imax yet, next on my shopping list but seems that its the best budget charger. Busy building a workshop with all the proper fire precautions as well! BTW at the discharge end, as well as the main thick red and black...

I may try that, I've got some charged 18650 cells kicking about, i may knock up some leads just to give each cell a tickle one at once. If I can bring the whole pack up to say 20v then I beleive the BMS should allow me to charge properly. If not I bought some nice cases and BMS boards for my...

Some pictures from the phone.

Doh, cheers Dave!

So, bought a couple of batteries off Ebay, faulty, marked as do not charge. They're 36v 9Ah ones designed for Momentum bikes. Out of the box they read about 4V, so out with the screw driver and in bits to investigate. BMS looks undamaged and measuring via the balance leads each cell is about...

If Wes doesn't take you up I'll have one if the January special price is good!

Many thanks to Dave for sorting me a controller out in record time, plus some great advice on the way! I promise I'll post pictures of the conversion when I'm done sourcing batteries!