

With the Battery Tender, the switchover at 0.5 amp results in an absorption charge mode length of approximately 1 hour.
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The result is that for an extended period of time, not to exceed 8 hours, the Battery Tender Plus output voltage will be held at a constant voltage that is significantly higher than the float voltage. The Battery Tender Plus switches to float mode when the charge current drops to 0.1 amps. The Battery Tender switches to float mode when the charge current drops to 0.5 amps. To achieve that goal, it was necessary to modify the absorption charge mode in the following way. RECHARGING AGM BATTERIES: The primary difference between these 2 chargers is that the Battery Tender Plus was specifically designed to accommodate the charging requirements of the new, Absorbed Glass Matte (AGM) style batteries. Both the Battery Tender and the Battery Tender Plus operate in 3 charge modes, bulk charge, absorption charge, and float charge. Physically, there is virtually no difference between these 2 chargers. Both chargers have a regulated, nearly constant 1.25-ampere output charge current during the bulk charge phase.

Both chargers are constant voltage type with precisely regulated output current limits. Typically, power sports engine start batteries are in the 12 Ah to 20 Ah capacity ranges. OVERVIEW and COMPARISON: The Battery Tender and Battery Tender Plus battery chargers are both designed to provide a quick, economical means to recharge motorcycle and engine start batteries used in other power sports equipment.
