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Best Battery Tender for RV


By: This Informed Life, Staff Writers
Updated on July 11, 2023
6 minute read

RV enthusiasts know that keeping the batteries charged and in optimal condition is crucial for a successful and stress-free road trip. A reliable battery tender ensures that your RV's batteries stay charged and ready to power your adventures.

Investing in a quality battery tender is a smart move for any RV owner. It ensures your RV's batteries stay charged and ready, preventing any power-related inconveniences during your travels.

  • Later in this article I will give you a pro tip on how much longer a battery will last by keeping it hooked up to a battery tender and what that equates to in saving money.

Consider your RV's specific needs and choose a battery tender that suits your requirements. Whether you prefer a simple, compact charger or a more sophisticated, multi-step charging system, keeping your RV's batteries in optimal condition is essential for a smooth and enjoyable road trip.

Some RV owners store their RV’s in a colder climate which makes using a battery tender that much more important. With sometimes many months not using your RV coupled with chilly winters a battery tender is a needed accessory.

In this article, we'll explore some of the best battery tenders for RVs, helping you make an informed decision and keep your power ready on the road.

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Understanding battery tenders

Batteries are the lifeblood of many devices and vehicles, providing the necessary power to keep things running smoothly. However, keeping batteries charged and in good condition is often a challenge, especially for vehicles like RVs that may not be used continuously.

This is where a battery tender comes into play. In this article, we will delve into what a battery tender is, how it works, and why it's a valuable tool for battery maintenance.

What is a battery tender?

A battery tender, also known as a battery maintainer or smart charger, is a device designed to keep a battery at its optimal charge level without overcharging.

Unlike traditional chargers that can inadvertently damage batteries by continuously providing a charge, a battery tender monitors the battery's state and adjusts the charging rate accordingly.

How does a battery tender work?

A battery tender works by employing a microprocessor and specialized circuitry to regulate the charging process.

Here's a breakdown of its operation:

Monitoring Battery Voltage and State of Charge

The battery tender continuously monitors the battery's voltage and state of charge. It assesses if the battery needs charging or if it's already fully charged.

Charging Phase

If the battery tender detects that the battery requires charging, it enters the charging phase. During this phase, it provides a controlled and appropriate amount of current to the battery to bring it to the desired charge level.

Absorption Phase

Once the battery reaches a specific charge level, the battery tender switches to the absorption phase. In this phase, the charger maintains a constant voltage while allowing the current to decrease, ensuring the battery is fully charged without overcharging.

Float or Maintenance Phase

After the absorption phase, the battery tender switches to a maintenance or float charge mode. It provides a low, constant voltage to compensate for the battery's self-discharge, keeping it at an optimal charge level without overloading or damaging the battery.

What are the benefits of using a battery tender?

Using a battery tender offers several significant benefits:

Prolongs Battery Life

By preventing overcharging and maintaining the correct charge level, a battery tender helps extend the lifespan of batteries, saving you money on replacements.

Ensures Readiness

 For vehicles like RVs that are not used constantly, a battery tender ensures the batteries are always ready for use. This is especially important for emergency situations or unplanned trips.

Saves Time and Effort

Battery tenders automate the charging and maintenance process, saving you the hassle of manually checking and charging your batteries regularly.

Prevents Damage

Traditional chargers can cause damage by overcharging, but a battery tender's smart technology prevents this, ensuring your batteries remain in good condition.

How many volts are in a RV battery?

RV batteries typically come in two voltage categories: 12-volt and 6-volt batteries. The most common type used in RVs is the 12-volt battery, either as a single 12-volt battery or as a bank of multiple 12-volt batteries connected in parallel or series-parallel.

In some cases, RVs use 6-volt batteries connected in series to create a 12-volt system. When two 6-volt batteries are connected in series, their voltages add up to provide 12 volts.

It's important to note that the voltage of a battery refers to its electrical potential difference, which is a measure of the electric potential energy per unit charge.

The voltage of a battery is a critical factor in determining its compatibility and usage within the RV electrical system. Always ensure that the batteries you use match the RV's electrical requirements and are properly connected and maintained for optimal performance.

How much longer can a RV battery last by using a battery tender?

The exact extension of a battery's life with the use of a battery tender can vary, but it's not uncommon for a properly maintained battery, combined with regular use of a battery tender, to last significantly longer compared to a battery that is left unattended or connected to a traditional charger.

By prolonging the cost of paying for a new battery due to the lack of use, cold climate and more you will recoup the cost of buying a battery tender for your RV.

Lets dive into the list of best battery tenders for RV

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