Charging Rates and Times
A standard overnight recharge is normally recommended for typical lead-acid batteries.  This is based on a C/10 charge rate.  (C=Ah capacity of your battery).  For example.  The recommended charge rate for a 7 Ah battery is 700 mA.  Battery manufacturers publish maximum in rush rates for their batteries. 

If a faster recharge time is required, the following formulas can be used to determine either the correct charge rate or the time required to recharge your battery to 90% of capacity.  The Ah rating of the battery x 1.2  divided by the charging circuit max current, equals the amount of time (in hours) required to recharge the battery to 90%. These times are based on a fully discharged battery.  For 100% recharging, add 3 hours "float" time to the charging time.  If the battery is only partially discharged, the recharge time will be shorter.

Recharge Time (hours) =

1.2 x Battery Capacity (Ah)
Charging Current max (Amps)

(add 3 hours for 100% charge)

The rule of thumb is approximate however and battery data from the manufacturer is the best way to determine the maximum charge rate for a given battery.  The 800 mA charger below has been "blessed" by the battery manufacturer for use with the 5 Ah and 7 Ah batteries on this page.



Xenotronix Battery Charger, 800 mAUnique automatic battery charger charges and maintains 12 volt bat..




Xenotronix Battery Charger, 2AUnique automatic battery charger charges and maintains 12 volt batteri..


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