A battery that might sit for a month at a time, would only need a trickle charge or about 1 amp, a charger of this type can stay hooked to the battery for the whole month. A 10 amp would be for a quick charge or only about 4 - 12 hours depends on how fast the battery lost the charge. A 10 amp charge would cook the battery if left for days.
Bear in mind that motorcycle batteries tend to age quite quickly, and any continuous charge in excess of 1 amp might cause unwanted gassing. Check the water level too, since this also influences the rate of charge. Any battery that is hesitant to take a charge might have excessive sulfation of the plates, and no amount of trickle charging is going to reverse that.
Lead-acid batteries do not like being left in a discharged state, and they might have to be 'cycled' to regain useful status.
By 'cycled', it is meant that the battery is charged (as best possible), then used to crank a starter until almost flat, then the process repeated, sometimes two or even three times. If a battery still fails to hold a useful charge after three charge attempts, replace it.
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