A123 M1 Cells from Dewalt 36v packs

[MetalMan]

After more than a month, I now have two separate packs using A123 cells. The first I built is a 3s2p and a 2s2p in series (5s2p). This pack was made using a technique I developed. The basis for this technique is soldering the cells side by side, but then putting them into a stick configuration. Basically, it's 5 groups of 2 cells in parallel. And with this method, I was able to keep the vents open, in the case that the cells need to vent. The copper braid I used to connect the cells together is soldered onto the metal tabs that came welded onto the cells.

Just yesterday I finished my two 2s2p brick packs. These are squares, 2 x 2. I soldered them together the same way as with the first packs, but didn't put them into a stick form.

I'll try to get some pics soon. Unfortunately I didn't document the buildup on the stick packs, so you won't be able to see how they were assembled.

[JThiessen]

I noticed that another manufacture (either Bosch or Hitachi) actually monitors individual cells on the charger for their Li-ion batteries.

[BrianG]

Not sure about the DeWalt packs, but the emoli cells in the Milwaulkee packs monitor each cell as well...