Ernie Ball USB-C rechargeable batteries by Paleblue are sustainable, high-performance lithium-ion batteries designed for musicians and everyday use. Available in 9V and AA formats, they provide constant, full-power output and recharge quickly via USB-C. These batteries reduce waste, save money over time, and are ready for use across musical gear, wireless packs, pedals, and general household devices. AA 4-pack is part number P09643.