Technical Specification is 300 charge.
After 300 charge, the battery will still work, but it might not hold the full 100% power.
Let say after 300 charge, at the 400 charge, the battery drop by 20%, you will still get close to 1000 full power shots with your flash.
We have many photographer who have use and tested the Charger Devices CD-2X2, what they do is, they only charge it when the Battery indicators drop to 1 or 2 bar.
There are photographer users of our Charger Devices CD-2X2 who post us the question of, why after their 2 events coverage with flash and our Charger Devices CD-2X2, our battery indicator does not seems to drop. The reason is, there are still lots of battery power in the Charger Devices CD-2X2, therefore it will not drop till it reaches 70% power.
Cost of Battery replacement is around SGD$150.