About this replacement
GODOX V860III — 7.4V Li-ion Replacement Battery (VB26A / VB26B)
This is a 7.4V, 3000mAh Li-ion replacement battery for the GODOX V860III speedlight. It fits directly in place of the original VB26A and VB26B cells. The V860III is a wireless camera flash, and this battery powers both the capacitor recharge circuit and the radio trigger electronics between shots.
- V860III fit confirmation: The V860III uses a dedicated battery bay with a proprietary contact plate — only cells matching the VB26A/VB26B footprint seat correctly and complete the BMS handshake. This cell matches that footprint and connector orientation.
- Bench tested on actual hardware: We ran this cell through sustained full-power burst sequences on the V860III. The BMS held voltage steady across repeated capacitor recharge cycles and did not trip during high-draw discharge events.
- First-install cold start on the V860III: After fitting this cell, power the flash fully off before firing the first shot. The V860III BMS initialises the charge state only from a cold start — swapping the battery mid-session without a full power cycle can cause the unit to misread remaining capacity.
Flash output stepping down after 10–15 full-power shots
At full power, the V860III pulls a large burst of current to recharge its capacitor after every shot. If the cell's internal resistance is elevated — common in aged or depleted batteries — voltage sags during that recharge draw. The BMS reads the sag as a low-charge condition and signals the flash to reduce output, even when the display shows charge remaining. A fresh cell with low internal resistance holds voltage under that recharge load and keeps output consistent through a full shoot.
Recycle time between flashes slower than the original cell
A new cell often ships with slightly higher internal resistance than a fully conditioned one. This slows the current available to recharge the capacitor, which extends recycle time noticeably in the first few sessions. Run five full discharge-and-recharge conditioning cycles and internal resistance drops as the cell's chemistry stabilises. After conditioning, recycle time on the V860III should return to the spec range you'd expect from the original factory cell.