Battery current draw.

[ikrel]

I have recently acquired 2 12v 7AH Lead-acid Batteries, I after much googling I still have not discovered how much current I can draw safely from a battery. So my question is: How much current can I draw safely from a 7AH Lead acid battery, or other batteries for that matter.

The battery is very similar if not identical to this one: http://www.zbattery.com/b-b-12v-7ah-sealed-lead-acid-battery#
the datasheet says Max discharge current 105A for 5s,and I don't understand the Discharge charts at the bottom.

you can find the datasheet in the specs.

[Jeff1946]

Current produces heat which could cause damage if too high for too long.  As I read the chart it shows how long the battery can produce a constant current until the single cell voltage drops to a given voltage.  In this case it shows how long to reach 1.6  to 1.8 V.

[ikrel]

So Basically this chart (Constant Current) is telling me I can Draw 30.8A for 5Min safely before a fully charge battery(1.75v per cell) will drop to 1.60v per cell.

OR

Does it Mean I can draw 26.9A for 5Min when the battery is reading 1.75v per cell (nominal charge)?

When would i need to charge the battery, nominal charge is 1.75v per cell. What kind of voltage drop do i need to look for before i know the battery needs charging?

[G7PSK]

The terminals on those batteries are 17 amp Lucar type so that may be the practical limit to the current draw otherwise most lead acid batteries will give currents running in the hundreds of amps for a brief time including the little 7 amp hour units I have seen them in car booster units and used as a battery to start motorcycles how long they last like that is another matter.