To obtain maximum battery service life and capacity, along with acceptable recharge time and economy, constant voltage-current limited charging is best. To charge a sealed lead acid battery, a DC voltage between 2.30 volts per cell (float) and 2.45 volts per cell (fast) is applied to the terminals of the battery.
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Existing battery charging technology relies on microprocessors (computer chips) to recharge, using 3 steps of regulated charging. These are the “smart chargers”. These are readily available. The three steps in lead-acid battery charging are the main current inputs for conversion, and float charge on a continuous period.
The protocol for charging AGM batteries with a regular charger can be summarized to a few steps: Check the current setting: Verify that the initial charging current does not exceed a charging rate of 0.15C. Check the current using the gauge on the charger or a clamp meter.
Get an external battery charger that is compatible with your phone’s battery type. Detach the battery from your phone if possible. Insert the battery into the external battery charger, following the manufacturer’s instructions. Connect the external battery charger to a power source using the provided cable. Allow the battery to charge fully.
First connect the red (+) Positive clamp from the charger onto the positive terminal of your battery . Secondly, connect the black (-) negative clamp to the negative terminal on your battery. Make sure your charger has been set to the correct output, 12V or 24V, and charging time. Switch on the battery charger..