I did used that lion batt 2 years ago.

It's produced a damned hrof for my AK.
Though i got probs after 3months,
Two cells damaged because of conventional charger.
The Lion Batt lacked of balancer connector.
You need to buy Lion or Lipo batt with balancer plug that look like this:

And you also need to buy a "true" Balancer Charger for this.