12V 120ah lead acid battery
SRD120-12

1.Good resistance to impact:Fully charged battery naturally fall from 20cm up to 1cm thick hardwood board 3 times, there is no leakage, no cell expansion and cracking, open circuit voltage is normal.
2.Good resistance to vibration:Fully charged battery fix tight, with 4mm amplitude, 1.67Hz frequency vibrate for 1 hour, there is no leakage, no cell expansion and cracking, open circuit voltage is normal.
3.Good resistance to overcharge:Charge the fully charged battery with 0.1CA for 48 hours at 25ºC, there is no leakage, no cell expansion and cracking, and open circuit voltage is normal, and the capacity to maintain the rate to 95% or more.
4.Good resistance to over discharge:, fully charged battery after discharge for three weeks with constant resistance at 25 ºC (resistance value is equivalent to the battery discharge 1CA resistance), still could be charged and the capacity recover to more than 75%
5.Good resistance to high current:Fully charged battery discharges with 2CA for 5 mins or discharge with 10CA for 5 secs.There is no conductive part melted, no deformation of appearance.

Battery Structure
1.Container/Cover:Made of UL94HB and LU 94V-0 ABS Plastic
2.Negative Plates:Use the special PbCa alloy grids, optimize the recombination efficiency and less gassing.
3.Separator:Import high quality AGM separator.
4.Postive Plates:PbCa grids minimize corrosion and prolong life.
5.Terminal post:Cooper material with maximum conductivity, enhance the high current rapidly.
6.Vent Valve:Allows the release of excess gas automatically for safety.

Application
UPS, solar systems, control systems, power systems, wind energy systems, telecommunication/communication systems & etc.

Characteristics
1.Excellent safety performance
2.Good dischargeing performance
3.Good stock-proof performance
4.Good impact-proof performance
5.Good resistance to overdischarge
6.Good resistance to overcharge
7.Good resistance to high current

Operation and maintenance manual
For maintenance free battery, it's free maintenance in the operation.But we can only use it in proper operation to keep the long lifetime of the battery,

(1) Battery Installation
Batteries should be installed possibly in a clean, cool, ventilated and dry place.The battery should be placed upright.Each terminal between the batteries is connected firmly.
(2) The ambient temperature
Ambient temperature is important factor for the battery operation.When the ambient temperature is too high, Battery plate corrosion will be increased, while absorbing more moisture;When the ambient temperature is too low, the battery will not be full charged.All this will affect the battery life.Therefore we suggest the working ambient temperature is around 25 ºC.
(3) The charge and discharge current
Battery charge and discharge current usually uses the concept C, the actual value of C is related to the capacity of the battery.For example,a 100AH battery:1C = 100A.Charging current is around0.1C;The charging current must not be bigger than 0.3C.Discharge current general requirements in0.05 ~ 3C range.
(4) Charging voltage
After the battery is full converted to float charging, the float voltage is around 13.0V.If the charging voltage is too high will cause the battery overcharge, otherwise the battery will not be full charged.Charging voltage is abnormal, it may be caused by the battery configuration error, or it may be caused bycontroller failure.Do not choose the controller with bad quality.
(5) The depth of discharge
Depth of discharge of the battery life is alsoa important factor for lifetime of battery, the deeper the battery discharge, the fewer the number of cycles, so battery should avoided from deep discharge.
(6) Regular maintenance
Battery should be regular checked in every period time after used, such as check its outlook, measuring the average voltage of each battery, etc.