TM  11-5820-890-20-2 7-2 7.2. BATTERY DATA. a. BA 5372/U.   Nominal power drain in the OFF position is 0.2 mAH. It has the following characteristics: Nominal Voltage 6.5 V dc Weight 1.5 oz Capacity 6 + months (constant use) b. BA 5590/U.  This battery has a rated capacity of 12 amp-hours.  Due to differences in usage, the number of operating hours is not predictable. The RT gives a rough estimate based upon the amount of time transmitting and receiving, if the battery condition is entered when the RT is placed into service. Refer to the chart below for typical battery life.  The BA-5590 has the following characteristics: Nominal Voltage 12 V dc Weight 1.0 Kg (2.25 lbs.) Capacity 12 Amp-hours MANPACK BATTERY MANPACK RADIO MAIN POWER (BA-5590: Approximate Length of Expected Service:  RF PWR in HI) VOICE/DATA: FH & CT RT-1523 RT-1523A RT-1523B Normal (OPR)* 18 Hr 30 Hr 26 Hr Heavy (NCS)** 11 Hr 18 Hr 15 Hr Standby (STBY) 3+Mon 3+Mon 3+Mon *    Operator usage rate is defined as 9 minutes of receiving/monitoring to every 1 minute of transmitting,       on average. ** NCS usage rate is defined as 2 minutes of receiving/monitoring to every 1 minute of transmitting,       on average. c. Storage.  Extended periods of storage have minimal effect on lithium batteries. The BA 5590/U has an estimated shelf life of 5 to 10 years when stored a  clean, dry, well ventilated area. WARNING DO NOT store lithium batteries with other hazardous materials. DO NOT store lithium batteries near open flames or extreme heat. CAUTION DO NOT store lithium batteries in unused equipment for more than 30 days. DO NOT accumulate or store waste batteries for more than 90 days. DO store lithium batteries in a cool (less than 130 degrees F), dry well ventilated area.  Bulk storage of batteries should be in a sprinkler protected area.