There’s a reason why the Battery Tender 021-0123 Battery Tender Junior 12V Battery Charger is one of the most popular in the world and is arguably the best 12V battery charger. In fact there are several reasons.
It’s not because it’s the most powerful charger out there. It’s not because it has a lot of extra “cool” features that you don’t need. It’s not because it’s large and its presence will dominate your garage.
Very simply, the Deltran Battery Tender Junior 12V Battery Charger has the brains, performance, value, and durability you need to charge and maintain your 12V batteries now and over the long haul.
For example, this charger/tender is fully automatic and computer controlled. It cost less than many chargers with half its capability. You can take it anywhere and store it anywhere because it’s small and lightweight. Its built-in microprocessor controls a multi-step charging program that charges and maintains 12V batteries without overcharging. You can trust this battery charger because it’s made by one of the premiere manufacturers in the industry; Deltran.
As you can probably tell, we’re big fans of not just the Battery Tender 021-0123 Battery Tender Junior, but also the whole line of Deltran battery chargers. Take a look and see if this is the perfect battery charger and maintainer for you!
Battery Tender 021-0123 Battery Tender Junior 12V Battery Charger
It’s so simple to use and so small and compact that you might make the mistake of thinking it’s a simple device. Nothing could be further from the truth. This big, little charger has a powerful microprocessor that controls a multi-stage charging program smart enough to charge any of your 12V batteries and then maintain them automatically without overcharging. No more babysitting a dumb trickle charger while worrying that it’s going to damage your battery. Take a look at its great features.
- SuperSmart Charging Technology won’t overcharge your batteries
- Capable of charging all 12 volt lead-acid, flooded or sealed maintenance-free batteries including AGM and Gel cel
- 4-Step Charging Process including (1) Initialization (circuit verification), (2) Bulk Charge (Full power to 75% charge), (3) Absorption Charge (battery conditioning with constant voltage), (4) Float Charge (Indefinite maintenance charge)
- You can leave the Battery Tender Junior plugged into AC power and connected to your battery indefinitely without fear of damage to your battery or the charger
- Prevents sulfation that is caused by most simple trickle chargers
- Safety features including sparkproof DC output leads, short circuit protection, and reverse polarity protection
- Complete set of indicator lights keeps you informed about every step of the process
- Long 12-foot output leads
- Output current of 0.750 amps and output voltage of 12 volts
- Case dimensions are 3.313 in (85 mm) L x 2.313 in (59 mm) W x 1.875 in (48 mm) H
- 5-Year warranty against defects in materials and workmanship
- Compact and lightweight
- Great value
- Simple to use and automatic
- Excellent quality
- Warranty requires pre-paid shipment to manufacturer
- Charger gets hot during use
- Weak documentation
- Long initial charge times
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Battery Tender Jr. Comparison Chart
|Title||Battery Tender 021-0123 Battery Tender Junior 12V Battery Charger||Battery Tender 021-0128 Battery Tender Plus 12V Battery Charger||Battery Tender 800 Waterproof 12V Battery Charger||NOCO Genius G750 6V/12V 750mA Amp Smart Battery Charger and Maintainer||Black & Decker BM3B 6V and 12V Battery Charger / Maintainer||Charge Master Automatic Battery Charger, Maintainer & Conditioner|
|Feature||Spark 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
Selectable battery type: WET, GEL, AGM, Calcium Battery rejuvenation (desulfation) function
|Warranty||5 year material and workmanship||10 year material and workmanship||3 year material and workmanship||5 Year Limited Warranty|
|Height||9 inch||11 inch||10 inch||4 inch||9.75 inch||6.5 inch|
|Weight||1.8 pound||2.3 pound||3.2 pound||1.9 pound||1.95 pound||2 pound|
|Width||4 inch||4 inch||4 inch||10 inch||3 inch||2 inch|
|Length||8 inch||11 inch||10 inch||10.5 inch||5 inch||3.5 inch|
|Reviews||Read Reviews||Read Reviews||Read Reviews||Read Reviews||Read Reviews||Read Reviews|
|Link||More Info||More Info||More Info||More Info||More Info||More 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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