Battery Tender 021-0128 Battery Tender Plus 12V Battery Charger

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The Battery Tender Plus 12-volt/1.25-amp Battery Charger will be the convenient solution to the challenge of keeping 12-volt vehicle batteries optimally powered when not in use. It is able to charge any lead-acid battery--including standard and sealed AGM and Gel Cell battery types and it is also designed to become all to easy to use within difficult spaces, to work with a 4-step charging program and safely function inside a fully automatic mode. Taken together this helps make the Battery Tender Plus 12-volt/1.25-amp Battery Charger a fantastic method of making sure your battery is fully charged and ready to travel if you are.

4-step charging with automatic float mode.
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The 4-step charge cycle detailed.
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Safe, 4-step Battery Charging
The Battery Tender Plus 12-volt/1.25-amp Battery Charger is a lot greater than a trickle charger. Powered by BTP microprocessor technology, it has a "brain". Utilizing a 4-step charging program (initialization, bulk charge, absorption mode and float mode), it allows that you simply connect the charger to some battery, in a choice of or out of an vehicle, and tend to forget about it until you get lucky and be ready to set it to work. Like all Battery Tender chargers, at the end with the regular charger cycle the it automatically switches its output voltage to some safe, storage or float level that eliminates the must worry regarding the damaging effects of overcharging, as well as the resulting must check on the condition of the battery. If or in the big event the battery voltage drops too far under load, output power resumes and also the charging cycle begins again. The unit also features sparkproof connectors, short circuit and reverse polarity protection, an simple to understand charging status LED indicator, a quick connect harness to use in hard to arrive at areas and almost no current draw from batteries connected to.

Key Features:

Perfect for many lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell).
Complete 4-step charging program (initialization, bulk charge, absorption mode and float mode).
Automatically switches to float / maintenance voltage after fully charging the battery.
If it voltage drops too far under load, full charger output power resumes.
Temperature compensated to ensure optimum charge voltage according to ambient temperature.
Solid state two color LED indicates stage of charger.
Spark proof and reverse polarity protected.
Includes quick connect harness for use in hard to achieve areas.
10 year warranty.
Charger Models
Output Voltage
Output Current
Charging Software*/
Battery Type AC Voltage/
Frequency Input
(Volts)
(Amps)
Battery Tender Junior 6V Battery Charger 6V 0.750A 3 Step STD & AGM 120 VAC, 60 Hz
Battery Tender Junior 12V Battery Charger 12V 0.750A 4 Step STD & AGM 120 VAC, 60 Hz
Waterproof 800 12V Battery Charger 12V 0.800A 3 Step STD & AGM 100 to 240 VAC, 50/60 Hz
Battery Tender Plus 6V Battery Charger 6V 1.25A 4 Step STD & AGM 120 VAC, 60 Hz
Battery Tender Plus 12V Battery Charger 12V 1.25A 4 Step STD & AGM 120 VAC, 60 Hz
Battery Tender Plus 12V Battery Charger (Gel Cell) 12V 1.25A 4 Step STD & AGM or GEL 120 VAC, 60 Hz
Battery Tender Twin 800 12V Dual Battery Charger 12V 0.800A 3 Step STD & AGM 100 to 240 VAC, 50/60 Hz
Battery Tender 12V 2-Bank Battery Management System 12V 1.25A 3 Step STD & AGM 100 to 240 VAC, 50/60 Hz
Battery Tender 12V 4-Bank Battery Management System 12V 1.25A 4 Step STD & AGM 100 to 240 VAC, 50/60 Hz
Battery Tender 12V 5-Bank Battery Management System 12V 2.0A  4 Step STD & AGM 120 VAC, 60 Hz
Battery Tender 12V 10-Bank Battery Management System 12V 2.0A  4 Step STD & AGM 120 VAC, 60 Hz
*Note: All Deltran rechargers charges you all types of lead acid batteries: either flooded (standard STD), sealed maintenance free Absorbed Glass Mat (AGM), or sealed maintenance free gelled electrolyte (GEL) batteries. However, for max battery performance in deep cycle applications (for example, managing a trolling motor), it's best to chose the Deltran charger which has the charging software specifically designed for your battery type. Fortunately, considering that the technical staff at Deltran is promoting charging software that actually works equally well for STD & AGM batteries, the only real choice to become made is between 2 models: either STD & AGM or GEL software.
10-Year Limited Warranty
Deltran provides a limited 10-year warranty on its Battery Tender Plus 12-volt/1.25-amp Battery Charger towards the original purchaser based on defective material or workmanship. Warranty is void in cases of product misuse, disassembly or modification. Other details regarding warranty limitations and procedures are contained inside the Deltran Battery Tender Charger's general limited warranty information sheet enclosed with this product.
BatteryTender Plus could be the most advanced charger/maintainer around the market specially designed for today's sealed lead acid batteries. The BT Plus uses micro-processor technology in a four stage charging profile to charge, improve, and float your battery so it can be ready when your are. Constant current charging and regulated voltage patterns allow the battery to be recharged fully and safely with no concern with overcharging.

Product Features

• Solid state two color LED indicates stage of charger; a quick connect harness for use in hard to reach areas


• Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell)


• Complete 4-step charging program (initialization, bulk charge, absorption mode and float mode) that maintains batteries at full charge without overcharging via its 4-step charging system


• Automatically switches to float/maintenance mode voltage after fully charging the battery


• Temperature compensated to ensure optimum charge voltage according to ambient temperature, and spark proof and reverse polarity protected; 10-year limited warranty