Marine Battery Charger: Battery Tender 12V Battery Charger

If you’re looking for a smart marine battery charger that can tough the elements, you have come to the right place. The Waterproof Battery Tender 021-0157-1 has all the features you need to charge and maintain your boat battery. Let’s take a look at all that it has to offer.

Waterproof Battery Tender 022-0157-1 Marine Battery Charger

So what makes the Battery Tender 022-0157-1 such a great battery charger?


First of all, this Battery Tender marine battery charger is one of the most popular on the market and it’s easy to see why. It has many great features and is sure to hold up in the harsh marine environment. If you haven’t already, you should definitely read my article Boat Battery Chargers Features and Specs For 2013 so that you can better understand some of the key features and specifications of a good marine battery charger.

Deltran Marine Battery Charger

Waterproof Battery Tender 021-0157-1 Marine Battery ChargerDeltran is the undisputed leader in charging technology and they have packed this unit full of features. From its waterproofing to its powerful 5 amp output, the Waterproof Battery Tender Plus is all business. You don’t have to worry about safety because Deltran has built-in all of the important safety features like short-circuit protection.
The Waterproof Battery Tender Plus marine battery charger comes with a microprocessor for more accurate control of charging and battery charging steps programmed in to cover all the important phases of the battery charging process. Whatever you can throw at this marine battery charger its fully-potted design will be able to handle it and for many years. Don’t want to carry the charger to the boat or set it up each time you need to do the charging or tending? It comes with handy flanges built-in to allow easy mounting directly to your boat.

Great Features and Specifications

Here are some of its important features and specifications:

  • Fully potted and completely waterproof
  • 5 Amps of power
  • Constant current and maintenance charging
  • 4-Step charging (Initialization, Bulk, Absorption, and Float)
  • BTP microprocessor-controlled charging and tending
  • Portable or fully mountable with mounting flange for permanent installation
  • Optimum shock and vibration resistance
  • Flexible charging applications including flooded and sealed, maintence free, and AGM Float/Maintenance function protects batteries from damage
  • Extra-strong steel case
  • Short circuit and reverse polarity protected
  • 72 hour safety timer
  • Light weight of only 4.4 pounds
  • Compact dimensions of 11.6 x 11.3 x 4.6 inches
  • Manufactured and backed by Deltran, the industry leader
  • Long 2 year Warranty

With all the great features and the Deltran name, it’s would be hard to find a better 12 volt marine battery charger for the price.


  • Durable construction
  • Good value
  • Very reliable
  • Plug and play


Long charging time

Alligator clips extra cost option

Battery Tender 022-0157-1 Review

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Marine Battery Charger Comparison Chart

TitleSchumacher SSC-1500A Ship 'n Shore SpeedCharge Charger with included battery clampsNOCO Genius GEN2 12V+12V 2-Bank 20 Amp Smart On-Board Waterproof Battery ChargerSchumacher SE-1-12S Fully Automatic Onboard Battery Charger - 1.5 AmpsBattery Tender 800 Waterproof 12V Battery ChargerBattery Tender 022-0165-DL-WH 12-Volt 2-Bank Battery Management SystemBattery Tender 022-0157-1 Waterproof 12 Volt Power Tender Plus Battery Charger
FeatureDigital meter displays battery charge status and test results
Features retractable handle for easy portability
System test helps diagnose problems
Electronic push-button control switches help select between display mode, charge rate, or battery
Accommodates 12-volt batteries only; Clamps are rated @ 75 Amps
20 Amperes (10 Amperes per bank) Smart On-Board Battery Charger for 12-volt batteries; charges and maintains all types of lead-acid batteries from 25-230Ah, 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
100 percent waterproof; completely sealed to protect against the most extreme environments and rated at IP68
Rapid Charging Technology; Charges batteries 2X faster than traditional battery chargers, and a lightweight, compact design
The most advanced charger ever; it features innovative and advanced technology that makes charging easy and simple; the charger makes important charging decisions so you don't have to. It is the safest, most effective charger you may ever use
1.5-amp charger
Has reverse polarity protection
Molded with plastic weather proof case
Plugs into an electrical wall outlet
Can install next to the battery on automobiles, boats, tractors, golf carts, and other equipment
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
Solid state two color LED indicates stage of charger; spark proof and reverse polarity protected
Two independent charging stations, each providing 12 volts/1.25 amps, with temperature compensation to ensure optimum charge voltage according to ambient temperature
Complete 3-step charging program (Initialization, Bulk Charge, Float Mode) allows for optimization of battery power, without overcharging
Perfect for all AGM (absorbed glass mat), sealed maintenance free and flooded batteries
2-year limited warranty
Fully mountable
Vibration resistant
Steel casing for extra strength and works at 5 ampere
Completely safe SC and RP protected
2 year warranty
Warranty5 year limited warranty3 Year Limited Warranty2 year limited warranty3 year material and workmanship2 year material and workmanshipTwo (2) Year Warranty
Weight4.83 pound7 pound0.25 pound3.2 pound3.3 pound4.4 pound
Width12 inch9 inch8 inch4 inch10.5 inch11.3 inch
Length4 inch10.2 inch2 inch10 inch11.6 inch11.6 inch
Rating4.2 out of 5 stars4.3 out of 5 stars4.3 out of 5 stars4.6 out of 5 stars4.8 out of 5 stars4.6 out of 5 stars
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Product prices and availability are accurate as of Jul 8 2:40:09 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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As always, thanks for reading!  I hope this article has given you valuable information to make a decision on the highly capable Waterproof Battery Tender Plus 022-0157-1 marine battery charger.

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