Oftentimes, we can find it difficult to see the forest for the trees, as the old saying goes. That is particularly true when applied to RV batteries. Technical terms such as run times, flow characteristics and equalize charging can be overwhelming and cause us to lose track of what comprises simple upkeep. The truth is, with all amps, alternators and relays aside, RV batteries are really not complicated, and with a little time and attention, they can last for quite a number of years.

Webster’s definition of a battery is: “A group of cells connected to produce an electric current.” Batteries connected in parallel are called a battery bank. Battery banks are separated into two categories — house and chassis. You will find the house battery bank located in an outside bay. Chassis batteries are usually situated in an outside bay compartment or next to the engine.

One of the bigger RV misconceptions I had was thinking that as long as the motorhome was plugged into shore power there was no need to maintain the batteries. In reality, the motorhome batteries are on call at all times to act as a load stabilizer that provides consistent incoming charge, as well as a buffer against spikes and peaks. In fact, a requirement for the inverter to operate is a battery bank in good health. Now I realize that notwithstanding electrical shore power, the batteries still call for regular upkeep.

Interstate Batteries, a specialty company in business since 1952, outlines three specific steps for battery care: inspect the case, check for corrosion or connection problems, and if the battery is liquid lead acid, add distilled water before the plates are exposed. You can identify liquid lead acid batteries by the detachable caps located at the top of each battery cell. Some types of chassis batteries may come with a plastic label that requires removal in order to access those removable caps. Absorbed Glass Mat or Gel Cell batteries do not require water replenishment in the cells and these battery types are sealed for life. If you have any question regarding the type of batteries in your motorhome, it is a good idea to seek the advice of a qualified service technician.

Inspection and maintenance of the motorhome batteries is a good thing to make routine, but the practice of working around this highly charged chemical compound is anything but run of the mill and should be taken seriously at all times. Wear protective clothing, including safety eyewear. Remove all metal jewelry and refrain from smoking. Keep a supply of water on hand. Use a baking soda solution to rinse battery spills from clothing. In the event battery acid comes in contact with skin, take off outer layers of clothing and flush the affected area with water. Seek immediate medical attention. Only perform work on the batteries in areas that provide adequate ventilation and avoid setting tools or wire on the top of the battery case to prevent causing an accidental short.

Corrosion around the battery case and cables is the result of electrolyte spills and gases. Build up can be reduced by routinely wiping away corrosion from the battery case and connections using a specially designed cleaner available at most auto supply outlets. Spills often splash so it is a good idea to wipe down the battery bay itself, including the interior side of the bay door.

Running the batteries down to no charge on a regular basis can shorten their life. When the monitor panel reports a 50 percent state of charge, replenish the batteries by plugging into shore power or operating the generator. Failure to hold a charge can be a sign that the battery is nearing the end of its life span. You can determine how much energy is left in a liquid lead acid battery by testing the electrolyte levels with a hydrometer (Pictured on page 21). Each cell produces an individual result, which makes it necessary to test all six cells in the battery. Refrain from leaning over battery vents while testing. Instead, stand at a safe distance

Batteries don’t like extreme weather anymore than the rest of us and can act up in protest.

and turn your face away from the open cell.

Batteries don’t like extreme weather anymore than the rest of us and can act up in protest. When the batteries are away from shore power in temperatures below 32 degrees, you can keep them warm using a custom designed ‘battery blanket’ or a plug in heater that slides under the battery bank. In excessively warm weather it doesn’t hurt to open up the battery compartment and generate some airflow while the RV is parked.

There is one thing that even the experts can’t predict, and that is how long you can expect a bank of batteries to last. Too many variables are at play for anyone to venture a guess, but it isn’t out of the realm of possibility to see a quality brand last up to seven years if they have been well maintained. When it is time to buy new batteries, replace the complete bank to avoid having weaker batteries put too much drain on the new. Try to use the same battery size and type, but if that isn’t possible, make sure they all have identical amp hour ratings.

Store the new batteries in a dry location safely away from heat and flames. Install batteries only when they are clean and dry. Use caution to prevent injury from heavy lifting. Avoid using straps designed to lock into the post when carrying a battery and risk physical damage to the internal connections. Do not install batteries backwards. Connecting cables in reverse order can cause serious permanent damage to electrical components inside the RV.

According to Jeff Westing of Interstate Batteries in Eugene, Oregon, disposing of old batteries means more than simply throwing them away in the trash. “In most states it is illegal to dispose of batteries in a landfill,” he said. “The best place to take an old battery is back where you bought it. You may be due a refund of the core fee that can be applied against your next battery purchase. So remember to RWYB — Return Where You Buy.”

There is no need to be overwhelmed by technical terms that seem better suited for a conversation with Einstein than an electrical source in a motorhome. The proper care and upkeep of batteries boils down to a minimal investment of time that pays off in long battery life dividends. Make inspecting and managing your batteries part of your routine schedule.

In an upcoming issue of Holidays, we’ll further explore the technology behind Absorbed Glass Mat (AGM) batteries, their application, and their benefits to the RVer.