Well most of the Lithium chargers for loose cells only do one or two cells at a time. I think you can still use that Alin Lithium charger if you follow these guidelines, and stay around during the charging.
- 1) Use protected Li-Ion cells
- 2) Make absolutely sure you know the number of cells you are charging, since some of FiveMega's battery packs are 3 cells Serial (3S), others are 4S, others like the light in this thread are 4S 2P (2 parallel sets of 4S)--which is still considered as 4S in terms of the voltage of 4x3.7V = 14.8V.
Then make sure you are certain which position to choose on the charger for the slider voltage setting, and make sure it is clearly on the correct setting before you connect it to the battery pack.
- 3) Take the battery pack out of the light while charging despite that nice temptation to keep the pack in the light and use the handy tailcap plug. This way you can feel the cells as they are starting to charge to make sure none are getting really hot, or showing signs of smoking.
- 4) Check the voltage of the cells every 3-4 charges to make sure you don't have 1 or 2 cells that are a lot higher than the rest. That means you have to unscrew the pack to measure the cells, but still have the convenience of putting them back in and using the Universal charger to do all 8 batteries if their voltages are "balanced".
- 5) You need to have a backup charger(s) that does individual charging of each cell up to 4.2V to equalize the voltage ("balance") between all of them, which happens when you charge them until individual cell charger shuts off. There is no way around this.
- 6) Ideally, charge your Lithium pack universal charger in the garage (remove flammables) on a cement floor, with some sand to throw on it. That way, worst case scenario, you unplug the charger, and open the garage door for ventilation. No harm to your house.
If you are in an apartment or similar closed space, you could charge them in one of these lipo-bags
placed on top of some type of concrete, brick, or ceramic. Then just make sure you unplug the charger and exit the premises if a fire starts. Don't breath in the smoke from this fire, it is very toxic.