That one says it puts out 0.75 amps. It's OK, it will just take twice as long to charge up a dead battery but is OK to leave it connected for prolonged periods of time.
You can also just go to an Autozone store, Walmart, Harbor Freight (can go online), etc., and get a 1.25-2amp charger for a little less money.
If you get one of those small chargers, or a "battery tender" (not exactly the same thing), put the pigtail connector with the plug onto the battery so anytime you want to connect the charger you can just plug it in. You can also use that for an accessory plug, like for a GPS or cell phone charger or something with a light current draw.
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