Do not mount in a sealed housing. These batteries must be charged with a constant voltage charger with 2.3 V per cell in standby mode and 2.5 V per cell with a current limit of 0.25 x capacity (Ah) for cyclical applications (max. 20 hours charging time). Lead acid battery - NPH series. Valve-regulated, sealed lead-acid batteries, maintenance-free. Very good performance at high discharge rates 5 years design life Lead-calcium alloy grid Contains a safety valve Can be used in any orientation except upside down. Has been designed for cycle or standby mode Operating temperature range = -20 → +60°C. Dimensions = 106 x 90 x 70mm. Construction = AGM. Eurobat classification = 3 to 5 years. Designed for high throughput applications = Yes.