Most dead packs just have one or two cells out of balance. Open the pack, charge each cell individually, and find out what's really wrong, with a kit that has everything you need.
Shop the kits Watch the tutorialFour steps, and the full walkthrough is free on YouTube.
The included T10 tamper-proof Torx bit gets past the security screws.
Measure cell voltage with a multimeter to see which cells have drifted.
Clip the IP2312 charging module onto each cell and charge it individually.
Put the pack back together, or learn which cells need to be replaced.
Watch the whole process, including the safety section, before you start.
Pick the one that fits how you like to work. Battery cells are not included.
Clip on, charge, and move to the next cell.
No soldering or electronics experience needed. You'll need a USB power source and a multimeter (recommended).
The same rescue tool, and you build it.
A solder-and-learn project. You'll need a soldering iron, solder, a multimeter, and a USB power source.
Lithium-ion cells can overheat, vent, or catch fire if shorted, overcharged, or damaged. This kit is for people comfortable working with batteries.