Many countries such as India or Pakistan have an average temperature of 30-35°C during hot season. Inside the telecom cabinet, the temperature is even higher and can go up to 50 °C. You may already know it, for every 10°C increase in temperature, the battery life will be cut by two...
A typical VRLA battery takes between 8 to 12 hours to be fully recharged. In countries like Pakistan where the power condition is very bad, batteries do not have the time to be fully charged after each power outage. Local people needs to have another backup power: diesel generator (DG).
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