... Long lifespan, over 2000 times.2. Good quality with CE, ROHS, UN38.3, MSDS certifications, ... 40°C,charge fully prior to long storage periods or if it has been stored ... battery has been over-discharged or is self-discharging due to some defect/parasitic load. ... to extremes of temperature over 60°C,directly to sources of heat, direct sunlight or moisture and/or rain UN Approved lifepo4 battery pack with ...