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

Battery Tender 021-0128 Battery Tender Plus 12V Battery Charger can be an intelligent lead-acid battery charger made for 12 volt applications available as many vehicle types like everyday cars, trucks and motorcycles to boats and ATVs. This versatility also also includes all types of lead-acid 12 volt power packs. That includes GEL, MF, Wet, and AGM batteries.
Being an intelligent charger, the 3300 will look after the battery using a four-step process. It is this multi-step process that CTEK was built on as being a company. The charger will assess, repair, and recharge batteries with care in order that the battery isn't harmed possesses the longest life probable.

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Product Description

Amazon.com Product Description
The Battery Tender Plus 12-volt/1.25-amp Battery Charger is 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 is also designed to be easy to use in difficult spaces, to utilize a 4-step charging program and safely function in a fully automatic mode. Taken together this makes the Battery Tender Plus 12-volt/1.25-amp Battery Charger an excellent means of ensuring that your battery is fully charged and ready to go when you are.

4-step charging with automatic float mode..
The 4-step charge cycle detailed.. Safe, 4-step Battery ChargingThe Battery Tender Plus 12-volt/1.25-amp Battery Charger is much more 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 you to simply connect the charger to a battery, either in or out of a vehicle, and forget about it until you are ready to put the battery to work. Like all Battery Tender chargers, at the end of the regular charger cycle the it automatically switches its output voltage to a safe, storage or float level that eliminates the need to worry about the damaging effects of overcharging, and the resulting need to check on the condition of the battery. If or when the battery voltage drops too far under load, output power resumes and the charging cycle begins again. The unit also features sparkproof connectors, short circuit and reverse polarity protection, an easy to understand charging status LED indicator, a quick connect harness for use in hard to reach areas and almost no current draw from batteries connected to.
Key Features:

• 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).
• Automatically switches to float / maintenance voltage after fully charging the battery.
• If the battery 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 reach 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 battery chargers will charge 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 optimum battery performance in deep cycle applications (for example, running a trolling motor), it is best to chose the Deltran charger that has the charging software specifically designed for the battery type. Fortunately, since the technical staff at Deltran has developed charging software that works equally well for both STD ; AGM batteries, the only choice to be made is between 2 models: either STD ; AGM or GEL software.
10-Year Limited WarrantyDeltran provides a limited 10-year warranty on its Battery Tender Plus 12-volt/1.25-amp Battery Charger to 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 in the Deltran Battery Tender Charger's general limited warranty information sheet enclosed with this product.
BatteryTender Plus is the most advanced charger/maintainer on 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 is ready when your are. Constant current charging and regulated voltage patterns allow the battery to be recharged fully and safely without the fear of overcharging.

Product Details

• Product Dimensions: 11 x 4 x 11 inches ; 2.3 pounds
• Shipping Weight: 2.8 pounds (View shipping rates and policies)
• Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
• ASIN: B00068XCQU
• Item model number: 021-0128
  

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

Customer Reviews

Every time I want to fire up my old 71 Datsun (that's Nissan for those of you younger than 30) 240 Z there's a good chance that the battery has drained down and that I can't start it! Looking around at car forums I read about this nifty little gadget....It's like a battery trickle charger....sort of. Whereas it's not recommended to keep a trickle charger hooked up all the time, this one has circuitry to limit the current and sense when the battery needs charging. It only charges at 1.25 amps which is easier on the battery.
I've had it on for a month now and it's great. The first couple of days, the red light was on indicating charging. Since then it's been on green and the car starts right up. I live in Houston where the heat and humidity can be just as brutal on batteries as the cold.
I highly recommend this "tender" for those that have cars that stay unused for long periods.
As other reviews have mentioned it comes with a set of adapters that allow you to permanently attach pigtails to the battery posts and then you can quickly connect the tender without having to use the alligator clips (also included).
For the price and free shipping you can't go wrong!
UPDATE after two years of use.
I can now reconfirm that these battery tenders work great - I've had them hooked up continuously on two cars that stay in the garage a lot and I've NEVER had them not start right up. A quick glance at the LED display lets me know that the batteries are either charging or fully charged. It's a real pleasure to be able to go right up and enjoy your wheels without having to worry about whether the battery is dead. I can't say for sure, but I suspect that it lengthens the life of the battery as well.

I have an older version of this charger that I bought in the mid 90's. I used it to maintain my garaged Mustang's battery over the winter months for many years. I made a cigarette lighter adapter so all I needed to do was to plug it in instead of using the alligator clips. I have to say this thing is dead reliable! It always kept my battery in prime condition. I love it and recommend it highly.