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Battery Info

Home >> Technical Support >> Battery Info


What is a Battery

Storage, Care&Maintenance
Typical Applications Battery Safety
Size of Battery Disposal / Re-Cycling
Charging Glossary

Battery Storage, Care & Maintenance

The Storage or shelf life of a VRLA battery is usually between 12 and 18 months at 20 degree starting From a charged condition.

Warning C Never store in a discharged or partially discharged state.
Always store in a dry, clean, cool environment in a fully packaged condition.
If storage of 12 months or longer is required supplementary charging will be required.

Design Life

Float

Each battery type will be have a prescribed float design life. Please be aware of this life expectancy and replace the battery as End-of-life approaches. Keep a reference or lable the battery to show its date of installation to facilitate replacement at the correct time. Factors other than time may affect the life of the battery and this will be indicated by a reduction in capacity. The battery should be required duty. This may be well in advance of its design life if, for example, the ambient temperature is considerably above 20 degree ie 30 degree or more.

Cyclic

Each battery suited to cyclic use will reach End-of-life after a prescribed number of cycles. This number is dependant upon the depth of discharge of each cycle. The deeper the discharge, the less number of cycles to End-of-life. Depth of discharge is expressed as the percentage of the battery capacity required per duty cycle.


Battery Care

Each CCB VRLA battery is supplied I a charged condition having passed stringent quality checks.To ensure optimum battery performance and life, it helps to take care of your battery by observing the following:

Sulphation/Undercharge

Warning C Never leave a VRLA Battery in a discharged state.
If a battery has an open-circuit voltage lower than its rated value, then sulphation may well be the cause.

When a battery is left a discharged state or for prolonged periods of storage, lead sulphate crystals begin to form acting as a barrier to recharge and will prevent normal battery operation.
Depending on the degree of sulphation, battery may be recovered from this condition by constant current charging at a higher voltage with the current limited to one tenth of the battery capacity for a maximum of 12 hours.

Note: The applied voltage will exceed the normal recommendation and so the battery must be monitored (not left unattended) and removed from charge if excess heat is dissipated. The voltage required to force this maximum current into the battery will reduce as the battery recovers until normal charging can take place.

In extreme circumstances a battery may never fully recover from sulphation and must therefore be replaced.

Overcharge

As mentioned in Section 4 optimum charging relies mainly on voltage, current and temperature factors which are interrelated and all of which can cause overcharge.

Excessive charge voltages will force a high overcharge current into the battery, which will dissipate as heat, and may cause gas emission through the safety valve. Within a short period of time this will corrode the positive plate material and accelerate the battery towards end-of-life.

Under these conditions the heat produced inside the battery can lead to thermal runaway due to the increased electrochemical reaction within the battery. The battery may swell before failing and will be irrecoverable from this state. This situation is potentially dangerous.

Temperature

Warning - Heat Kills Batteries.
The recommended normal operating temperature is 20.

HIGH TEMPERATURE will reduce battery service life often quite dramatically (see figure 2 and 3).In extreme cases this can cause Thermal Runaway, resulting in high oxygen/hydrogen gas production and battery swelling. Batteries are irrecoverable from this condition and should be replaced.