The charger they give you for $70 is the same charger that has been rebranded by countless companys - its a chinese made unit and typically sells anywhere between $35 to $45. It's a decent balance charger buy by no means the best. I've had countless issues where it won't charge battery packs I've made for lights due to an individual cell having low voltage. There is a way around this, sort of like "jump starting" that cell. If your not comfortable with electronics read no more lol...
Basically the charging port on the battery has enough pins to probe between each individual cell - so if there are 3 cells, there will be 4 pins. Something like this:
(-) Cell_1 (+) Cell_2 (+) Cell_3 (+)
So if you measure from left (-) to the first (+) you will get cell_1's voltage. if you measure from the first (+) to the second (+) you will get cell_2's voltage... and so on.
This is how the charger gets feedback as to how the cells are balanced - it can then use a switch in the charger to either shunt or combine cells to balance out their voltage. The trick is to use this port to balance out the cell that is low with an external cell of similar capacity. I do this by using some individual li-po cells I've taken out of larger packs.
So what you do is find the cell using the common ground, and the pin its on - now you connect leads to those two pins. These leads will be connected to the individual li-po cell external of the battery just like jump starting a car - positive to positive, ground to ground. The host battery (external) will be fully charged (done using the balance charger) and it will balance out the internal cell. Leave it on for a minute at a time and inspect the internal cells voltage - I believe the balance charger's cut off threshold is around 2.7 volts... maybe less - you want to get it back to around 3.1 volts at least - then it can do it's thing and balance it out like regular.
This is a good way to help bring a battery back back to life for some more testing and evaluation - it's possible you just over exerted it, and believe me I've done that all too many times (once left a 50W HID flashlight on, face down on my desk, came back the next day and it had burnt a crater into it lol). Soemtimes you can revive it like frankenstein, sometimes it's a total loss!
I hope that ballistic is using quality cells like the LiFePO4 cells from A123... otherwise they are making bank for selling
. I'm still buying one either way lol. Great to hear that they had some customer service, sometimes it just takes repeated calls to a higher up!