Most of the chargers put out about 1.5amps and will do a good job of charging the battery, But, @ that rate it will take time if the battery is run low. They are primarily a maintenance item and will with the pulsing technology break down or prevent sulfating from building and allow your battery to be charged to peak and ready to go for many years. By all means, use one, I used the tender since '98 and my battery lasted till last fall, when it finally got too high of internal resistance to be reliable. If your battery does get run down, What I do is put on automotive charger for an hour or two, then switch to the tender and walk away.
I love the fact that it can be put on battery and left there indefinitely without cooking the plates and boiling out of electrolyte of the wet type batteries. This was the biggest killer of batteries by the old style trickle charger of days of old.
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