The NiCd (Nickel Cadmium) battery cells are the type that we have used since 1982. We buy the best No Memory high quality cells and build them into multi-deck power-houses. We are the only company who actually guarantees the flashes per charge and the only company with an extended pro-rate warranty.
The Large NiCd Battery, BLRG is a popular size of Battery because it packs a lot of performance when you want the least amount of worry about your battery during a shoot. It's not unusual for photographers to get one of these as the "main battery" and maybe a small one as the "just in case" battery since you can switch them easily If you did drain the Large one.
If you use 200ws we guaranty 300 flashes per charge. If you use 25ws, that same battery gives you 2400 flashes. Likewise, if you use only 400ws, you should expect 150 or more flashes from this little battery.
The NiCd Batteries all have a 48 Month pro-rate warranty on the cells. For the Large Battery, that warranty loses value at $3.50 per month for 48 months. In some cases, there may be a sale price that is a better value than the total pro-rate as you reach the end of the warranty. There is a small labor fee to install the cells and the new battery cells always start a new pro-rate warranty. The case and electronics have a Two Year warranty from when it's originally purchased.