DG (deep cycle GEL) series batteries are pure gel batteries designed for frequent cyclic charging and discharging, as well as standby operation. DG series batteries are designed for solar and wind energy, medical equipment, marine systems, telecommunications equipment, UPS systems, and other applications. Number of full cycles - 450 Specifications: Number of cells: 6 Voltage: 12 V Nominal capacity: 65 Ah at 20 hour discharge to 1.75 V per cell at 25 ° C Internal resistance: 9 mOhm Terminal type: F11 (M6) Maximum discharge current: 400 A (5 seconds) Shelf life: 15 years Maximum charging current: 6.5 A Weight: 21 kg (Tolerance ± 5.0%) Test capacity: C3 27.3 AHC5 31.5 AHC10 35.1 AHC20 40 AH Charging voltage in buffer mode: 13.6 V ~ 13.8 V at 25 ° C Temperature compensation: -3 mV / ° C / cell Charging voltage in cyclic mode: 14.2V~14.4V@25°C Temperature Compensation: -4mV/°C/cell Operating Temperature Range: Discharge: -40°C~60°C Charge: -20°C~50°C Storage: -40°C~60°C Normal Operating Temperature Range: 25±5°C Case Material: A.B.S. UL94-HB, UL94-V0C Self-Discharge: RITAR rechargeable batteries can be stored for up to 6 months at 25°C, and then recharging is recommended. The monthly self-discharge rate is less than 3% at 25°C. Please charge the batteries before use. Please note! Failure to comply with the charge-discharge voltage and currents may damage the battery and void the warranty.