Neewer NB-Q4 Replacement Battery for Q4 Flash

The Neewer NB-Q4 is a purpose-built replacement battery for the Neewer Q4 400Ws 2.4G TTL flash strobe light. Rated at 21.6V and 2800mAh, it uses lithium-ion polymer cells to deliver up to 400 full-power flashes on a single charge—enough to cover most portrait sessions, event work, or product shoots without needing to stop and swap. At reduced power levels, the flash count climbs considerably higher, giving photographers extended runway during longer assignments.

Safety is addressed through a suite of built-in protections covering overcharge, over-discharge, overvoltage, overcurrent, and overheating scenarios. At just 0.9 lb (410g), the NB-Q4 adds minimal weight to your gear bag, making it a sensible spare to carry on location shoots where access to power outlets is limited. Keep in mind that no charging adapter is included with this battery—you will need the charger that shipped with your original Q4 flash or a compatible adapter purchased separately. Neewer also recommends a full initial charge before first use to maximize the battery's long-term health and cycle life.