Check your battery with a volt meter before hooking up the battery tender and write down the voltage. Leave the tender on for a day to make sure it gets a full charge. A battery tender is a trickle charger and brings the voltage up slowly. After a day (at least over 12 hours), disconnect the tender and check the voltage again with a volt meter and see where you are. It should read close to 13 volts for a good charge on a good battery.
What manufacturer makes your battery? I use a tender on both my bikes and all four of my ATV's religiously to keep them in peak condition.
2002 Victory V92C