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Zhongshan Fengge Storage Battery Co., Ltd.
Address: Xiaolan Town, Zhongshan City, Guangdong Province, East Man Hing Street, 1st District
Tel: +86-760-22833090
Fax: +86-760-22833191
Website: www.fengge.com.cn
E-mail: sales@fengge.com.cn

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(1) Capacity maintenance
Fully-charged battery after long-term storage, the capacity of which will become less and less, is in a state of discharge, which is called self-discharge. Even unused battery cannot avoid this. Self-discharge is caused by battery internal chemistry reaction and electrochemistry reaction.

  1. Chemistry aspect
    The active materials in positive(PbO2) or negative(Pb) will decompose or react to sulphuric acid(electrolyte) to become PbSO which is more stable. That is called self-discharge.
  2. Electrochemistry aspect
    Due to the impure materials, local circuit will be formed inside the battery or oxidation-reduction reaction will take place in the positive pole and the negative pole, which will arouse self-discharge. The self- discharge electric quantity of VRLA battery is very small. It is one third to one fourth the quantity of the common lead acid battery. That is because battery has a strong ability of capacity maintenance. Picture 1 shows the relations between the ability of capacity maintenance and storage condition.

figure 1 the ability of capacity maintenance, recharge and storage condition

(2) Storage
  The capacity of recharged lead acid battery will be affected after long term storage. But lead –calcium battery has a longer period of storage than traditional lead acid battery. Battery needs to be charged during storage. The interval of charge is given in figure 1

Figure 1 storage temperature and recommended interval of charge

Storage temperature
Recommended Interval of charge
Method of charge
Below 20oC(68oF)
Every 6 months
Constant voltage charging 2.275V/cell 16-24 hours
Constant voltage charging 2.45V/cell 5-8 hours 
Constant current charging 0.05CA 5-8 hours
Every 3 months
No storage

Although the method of charge is no more than constant voltage charge or constant current charge, most of the time capacity cannot reach 100% after the battery is charged. Therefore, battery needs charging and discharging many times.

(3) Open circuit voltage and residual capacity
  Figure 12 shows the relations between open circuit voltage and residual capacity.

Figure 12 characteristic of open circuit

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