If you’re looking for a smart marine battery charger that can tough the elements, you have come to the right place.



The Waterproof 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


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Marine Battery Charger


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What do you think of the Battery Tender 022-0157-1 Waterproof Charger?  Which waterproof charger are you planning to buy? Please take a moment to leave a comment below.

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.