Charge
(Maintenance Rules For Valve-Regulated Sealed Lead Acid Battery NP Series)

1. Under floating charge, charge is required with fixed voltage valuing 2.275V/single cell (provided at 25℃). Provided the temperature is lower than 0℃ or higher than 40℃, it is necessary to vary the charge voltage -3mv/single cell every 1℃, beginning at voltage of 25℃.

2. Under cycling charge, charge is required with fixed voltage valuing 2.40~2.50V /single cell (provided at 25℃). Provided the temperature is lower than 5℃ or higher than 35℃, it is necessary to vary the charge voltage -4mv/single cell every 1℃, beginning at voltage of 25℃.
Early-stage charge current is required to be lower than 0.25CA.

Volume of charge is set 100~120% of that volume of discharge. If ambient temperature is lower than 5℃, the counterpart is 120~130%.

Lower temperature (lower than 5℃ ) demands longer charge time, and higher temperature (higher than 35℃) disposes over-charge. Hence, 5℃-30℃ is an ideal range for charge under cycling use.

To avoid over-charge, setting up a charge-timer is recommendable, or adapt charge method to automatic trickle charge.

Temperature of the battery undergoing charge is required to range between -15℃~+50℃.

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