Since the Variax batteries are basically clones of the Sony NP-F550, I was wondering if I could use a Sony charger on my Line 6 batteries? I'm asking because my included charger doesn't charge my batteries anymore and new chargers are out of stock everywhere. At first I thought the included battery stopped holding a charge, so I bought a new one from the Line 6 store and it wouldn't charge either. I just get a red light blinking once a second. It never changes rate or color even after an overnight charge.