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

You’ve heard about it.  You want it and it’s easy to see why.  The Battery Tender 021-0128 Battery Tender Plus 12V BatteryBattery Tender 021-0128 Battery Tender Plus 12V Battery Charger Full View Charger is one of the most highly regarded and popular battery chargers on the planet.

It’s used by the military and even the Corvette Museum sells a version of it for Corvette owners.  See our article about Corvette Battery Chargers.

What makes it so great?  The built-in microprocessor gives you set and forget capability unsurpassed in the marketplace.  With its 4-step charging program it’s able to maintain your vehicle’s battery at full charge without risk of overcharging or damage.

Whether it’s your classic car, motorcycle, jet ski, board, RV, ATV that you store for any period of time, you can keep its battery maintained and ready for you next time you need to start it.  You just plug in the charger, connect the leads and the Battery Tender Plus will look after your vehicle’s battery for you without constant monitoring from you.

Be sure and see our advanced reviews of the Battery Tender Plus:

Battery Tender Plus: Best Car Battery Tender 2014

Battery Tender Plus: Best Battery Tender For Corvettes


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

Battery Tender Plus 021-0128 Battery Charger You obviously care for your vehicle since you’re looking for a way to maintain its battery.  With that in mind, you should choose the best battery tender you can find.  Usually that would mean spending a lot of your hard-earned cash, but in this case the Battery Tender Plus is also a great value for the money.  It has everything you need.  You get value, quality, performance, safety, and ease-of-use all in a compact package that is sure to be there for over the long haul.  Take a look at some of its great features.


  • Advanced microprocessor controlled charging won’t overcharge
  • 4-Step charging process that controls charging and can actually lengthen battery life
  • Temperature-compensated for accurate charging in any conditions
  • Charges any lead-acid, flooded, or sealed maintenance-free battery including AGM and Gel Cel types

  • Simple LED indicators keep you informed about the charging process
  • Safety features include spark-proof connections, short circuit protection, and reverse polarity protection.
  • 10-Year limited warranty against defects in materials or workmanship


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Battery Tender Plus 021-0128 Video


Battery Charger Comparison Chart

TitleBattery Tender 021-0123 Battery Tender Junior 12V Battery ChargerBattery Tender 021-0128 Battery Tender Plus 12V Battery ChargerBattery Tender 800 Waterproof 12V Battery ChargerNOCO Genius G750 6V/12V 750mA Amp Smart Battery Charger and MaintainerBlack & Decker BM3B 6V and 12V Battery Charger / MaintainerCharge Master Automatic Battery Charger, Maintainer & Conditioner
FeatureSpark proof during lead connection, reverse polarity protected and includes a 12-foot output cord and 5-year warranty
Perfect for charging all 12-volt lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell)
Complete 4-step charging program (Initialization, Bulk Charge, Float Mode) allows for optimization of battery power, without overcharging
Automatic charge cycle functionality switches to float mode after fully charging the battery
Solid state two color LED indicates stage of charger
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
Spark proof and reverse polarity protected; protected by a 3-year limited warranty
Designed for use on all AGM sealed maintenance free, lead calcium, and flooded batteries
100% waterproof and ultraportable at a size not bigger than a computer mouse
Complete 3-step charging program (initialization, bulk charge, and float mode) for maintaining optimal performance levels without over charging
Automatically switches to float/maintenance voltage after fully charging the battery
.75 Amperes Smart Battery Charger for 6-volt and 12-volt batteries; charges and maintains all types of lead-acid batteries from 1.2-30Ah, including Wet, Gel, MF, and AGM
Designed for safety; safe for anyone to use; does not generate sparks, and protects against reverse battery hookup, short circuit, open circuit, overheat, overcurrent and does not overcharge the battery
Keeps batteries charged and maintained; constantly monitors the battery to provide optimal battery performance, and extend battery life
Auto-Memory; Returns to the last selected charge mode when restarted for continuous charging
The most advanced charger ever; it features innovative and advanced technology that makes charging easy and simple. the vosFX Processor built inside every charger makes important charging decisions so you don't have to; it is the safest, most effective charger you may ever use
Battery Maintainer for use on 6V & 12V battery systems
Easy connection to vehicle battery using the included battery clips, O-ring terminals or vehicle DC plug
High-frequency smart charging technology keeps batteries at optimal charge
Automatically switches between charging mode and float mode monitoring
Built-in mounting bracket
Selectable amperage: 2, 4, 6 Ah
Battery thermal run away & overload protection
Soft start, gentle ramp-up constant current rate during bulk charge
Plug-N-Play connectors
Selectable battery type: WET, GEL, AGM, Calcium Battery rejuvenation (desulfation) function
Warranty5 year material and workmanship10 year material and workmanship3 year material and workmanship5 Year Limited Warranty
Height9 inch11 inch10 inch4 inch9.75 inch6.5 inch
Weight1.8 pound2.3 pound3.2 pound1.9 pound1.95 pound2 pound
Width4 inch4 inch4 inch10 inch3 inch2 inch
Length8 inch11 inch10 inch10.5 inch5 inch3.5 inch
Rating4.7 out of 5 stars4.7 out of 5 stars4.6 out of 5 stars4.6 out of 5 stars4.4 out of 5 stars5.0 out of 5 stars
ReviewsRead ReviewsRead ReviewsRead ReviewsRead ReviewsRead ReviewsRead Reviews
LinkMore InfoMore InfoMore InfoMore InfoMore InfoMore Info

Product prices and availability are accurate as of Jul 8 0:14:27 UTC but are subject to change. Any price and availability information displayed on the merchant site at the time of purchase will apply to the purchase of this product.


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