GP1272 F2 CSB GP1272F2 12 V 7 Ah CSB GP Series. These are general-purpose batteries with a nominal lifespan of 5 years in standby operation or over 260 cycles at 100% discharge cycle. Like all CSB batteries, they are rechargeable and dischargeable, extremely reliable, sealed, and maintenance-free. GP1272F2 (28W) delivers 28W during a 15-minute discharge to 1.67 V in the cells at 25 °C. This is a slightly weaker, lighter, and less durable version of the GP1272 battery. In the initial discharge phase, it achieves similar parameters to a typical GP1272, making it ideal for less demanding applications.