I’ve got this 4x18650 battery pack for a bike light and the cells are pretty tired. I’d like to replace them, but I’m trying to figure out the best way to do so. They’ve got very thin bars connecting the cells on both the top and the bottom. It looks like those are spot welded, and I’m assuming won’t come off all that easily.
What options do I have as far as soldering something to join the cells. I’ve done plenty of soldering, just not directly to a battery. I assume heat is a major concern.
I often see pre-fabricated ‘nickel strips’ being sold by stores that cell batteries / battery pack / solar BMS (battery management system), I think they are used for joining batteries together to forma a a battery pack like the one on your bike.
However, I have no personal experience with those nickel strips nor with soldering directly to batteries.
I wonder if nickel strips are the best (budget?) choice or if there are some other better materials for joining a battery pack together though.
I am using regular wires (according to the current rating).
make sure to have isolation on the positive side since the heat may damage the thin heatsrink and expose the negative side.