As a big battery manufacturers in China,Website: ,we supply many different kinds of batteries,such as the lead acid AGM battery,Gel battery,AGM deep cycle battery,Gel deep cycle battery,OPzV battery,OPzS battery ..etc .The following is our AGM Battery 12v 20ah features : 1.Using oxygen recombination technology: maintenance-free2.PbCaSn alloy for plate grids: less gassing, less self-discharging3.High quality AGM separator: extend cycle life and prevent micro short circuit4.ABS material: increase the strength of battery container. (Flame-retardant ABS is optional);5.High purity raw material: ensure low self discharge rate6.Silver-coated copper terminals (T1, T2 terminal), brass insert terminals and lead terminals improve the  electric conductivity1. Functional Parameter 5. Environment Temperature Nominal Voltage 12VDischarge Temperature -15~50℃Nominal Capacity (20 hour rate)20AhCharge Temperature 0~40℃Number of Cells 6cells Storage Temperature -15~40℃2. Rated Capacity at 25℃ (77° F)6. Inner Resistance & Max . Discharge Current 20 hour rate (0.05C, 10.8V)20AhFully Charged battery at 25℃ (77° F)15mΩ5 hour rate (0.165C, 10.8V)16.5AhMax. Discharge Current 300A (5s)1 hour rate (0.55C, 10.5V)11.8AhShort Circuit Current 1000A3. Capacity affected by Temperature (20 hour rate)7. Self-discharge  at 25℃ (77° F)40℃   (104° F)103%Capacity after 3 month storage 91%25℃   (77° F)100%Capacity after 6 month storage82%0℃    (32° F)85%Capacity after 9 month storage73%-15℃   (5° F)65%Capacity after 12 month storage64%4. Dimension and Weight 8. Constant voltage charging at 25℃ (77° F)Length 181mmCyclic use14.4~14.9VWidth77mmMaximum charging current 6AHeight 167mmTemperature compensation -30mV/℃Total Height 167mmFloat use 13.6~13.8VReference Weight 5.5kgTemperature compensation -20mV/℃AGM Battery 12v 20ah Typical  Applications :1.Electric Power System (EPS)2.Emergency light3.Emergency backup power supply4.Auto control system5.Aircraft signal6.Alarm and security system7.Electronic apparatus and equipment 8.DC power supply9.Communication power supply