9.6v 1100mah Echo 1 DLAP Battery (NiCD) This airsoft AEG battery was specifically designed for M4s that were front wired and have an Rail Interface System. This battery has been custom built to fit inside a box that resembles a DLAP box. The DLAP box can attach to any RIS or RAS unit that has standard rail spacing. The battery itself is made of Nickel Cadmium. This means several things in electrical and airsoft terms. The first is that the power output is only 9.6 volts, this makes it perfect for upgraded guns such as Classic Army, but a little over powered for some like Tokyo Marui. The capacity on the battery is 2000 mah, which translates into about 2000 shots (maybe as much as 2400) before the battery loses charge and needs to be put on another cycle. The second affects charging cycles. NiCd batteries have to be discharged before they can be charged during a typical charging cycle. If you don't discharge and instead just try and "top it off", the battery will eventually develop a memory like the older cell phone batteries. But this seeming deficiency is also a big positive in other areas. NiCd batteries are able to hold their charges longer during periods of time when they are not being used. They can also go through more charging cycles before loosing efficiency, on average about 450 versus the 300 that most NiMH batteries get. Remember to recycle this battery instead of throwing it out! Note: This battery must either be drained completely or discharged before being put on a charging cycle. Failure to do so may result in recrystallization and the eventual development of "memory". (Memory is bad!)