$39.95

Battery Tender Junior


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Battery Tender Junior

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. Typically, power sports engine start batteries are in the 12 Ah to 20 Ah capacity ranges. Both chargers are constant voltage type with precisely regulated output current limits. Both chargers have a regulated, nearly constant 1.25-ampere output charge current during the bulk charge phase. Physically, there is virtually no difference between these 2 chargers. Both the Battery Tender and the Battery Tender Plus operate in 3 charge modes, bulk charge, absorption charge, and float charge.

Both the Battery Tender® and the Battery Tender® Plus are 4-step chargers meaning that they operate in 4 charge distinct modes: initialization, bulk charge, absorption charge, and float / maintenance charge. The legacy marketing literature and the operating instructions do not identify the original Battery Tender® as having an initialization mode. Therefore there is a lot of old literature that refers to Battery Tender® chargers as 3-step chargers. However the basic initialization functionality was present but there was no LED status indication; the Battery Tender® simply would not allow output voltage to activate unless a battery was properly connected to the charger. The Battery Tender® Plus does have an LED indication to indicate a faulty battery connection, which, with a little extra software and battery checks, completes the mechanization of ‘initialization’, the 4th charging step, even though time sequentially it is actually the 1st step.

RECHARGING AGM BATTERIES: The Battery Tender® has an absorption charge mode, but the the Battery Tender® Plus has a different absorption mode maximum charge voltage and a timer to hold the absorption voltage longer. These specific changes were made to accommodate the charging requirements of Absorbed Glass Mat (AGM) style lead acid batteries.

Price $39.95
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