Review on Rechargeable 12V 11000MAh 9V 14500MAh 5V 26400MAh DC Output Lithium-Ion Battery Pack For LED Strip, CCTV Camera, Portable Li-Ion Power Bank With AC/DC Charger - Black by Shawn Hill

I have 4 of these. Different voltages and capacity ratings. I LOVE being able to go to Balboa Park to play my guitar through my stereo 30W amp without worrying about an AC outlet. A month ago one of these battery packs just quit. I had a back-up. I've been doing professional music for 45 years—You HAVE a back up! but the TalentCell that died just died. No warning. No nothing. It was fully charged and was working and then just shut down after like 3 minutes of run time! Probably the BMS (battery management system) went out. but the battery pack was less than two years old— had seen only weekend use—was never drained past 30%—and seemed like it was going to be good forever. At $60 - $70 that dead pack cut into my bottom line way too far LOL! . I loved this product—Now i just LIKE them.