How to rebuild a Black Diamond 11490 Battery (for Jetforce airbag backpack)
TLDR version If the battery in your 1st-generation Jetforce pack is dead, then you may be able to rebuild it with new cells. The repair requires some familiarity with electronics and soldering skill. It took me a couple of hours and cost about $50 in parts. However, keep in mind that you're replacing a tested, certified, reliable part with a sketchy, homemade version. And given that this battery will power a device intended to save your life, it should be obvious that you're taking a significant risk. Background After several years without touring, I pulled my Black Diamond Saga 40 Jetforce avalanche airbag backpack out of storage, and plugged it in to charge. Lots of flashing lights, mostly red, but the thing wouldn't charge. I tried different chargers on several different occasions, disconnected and reconnected the battery. No go. In retrospect, this is not too surprising, as I know that lithium ion batteries don't like being left in a fully-discharged state.