Help for shorten SLA battery charging time.

SLA charging & chargers
Unlike NiCads, SLAs are not really suitable for very fast charging. Most manufacturers recommend that they should not be charged in less than 5 hours, or at a charging current level of higher than 0.4C although some SLAs are able to accept charging currents of up to 0.8C for at least the initial phase of charging, without adverse effects.

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Pulsed Charger.
Uses a series transistor which can also be switched. With low battery voltages the transistor remains on and conducts the source current directly to the battery. As the battery voltage approaches the desired regulation voltage the series transistor pulses the input current to maintain the desired voltage. Because it acts as a switch mode supply for part of the cycle it dissipates less heat and because it acts as a linear supply part of the time the output filters can be smaller. Pulsing allows the battery time to stabilise (recover) with low increments of charge at progressively high charge levels during charging. During rest periods the polarisation of the cell is lowered. This process permits faster charging than possible with one prolonged high level charge which could damage the battery since it does not permit gradual stabilisation of the active chemicals during charging. Pulse chargers usually need current limiting on the input source for safety reasons, adding to the cost.

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