Generally, a low amp charger is recommended. A 10-20 amp charger can charge most automotive batteries. Fully charging a completely discharged automotive battery, for example, with a 10-amp charger may take approximately 6-10 hours at a temperature of 80°F. A longer charge time is required at lower temperature. Some chargers can automatically shut off when the battery is fully charged.
When you choosing charger for your battery. Please keep the following rule in mind. The maximum charger rate in amps should be 20% of the amp hour rating of the battery. Normally, deep cycle batteries do not require special charging procedures. However, KT Battery advises that you use a charger designed specifically for deep cycle batteries. That means to choose a charger where the maximum current (in amps) is less than 20% of the Ah rating. For example, an Delkor DC31 deep cycle battery is rated at approximately 100 Ah, so a 20-amp charger should be the maximum.
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