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1-800-769-2684

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Mon–Fri 7am–5pm

Phone: 503-362-2684
Fax: 503-362-2787

2725 Portland Rd. NE,
Salem, OR 97301

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Battery School

General Battery Care Procedures

General deep cycle battery care procedures

Reasons Why Batteries Fail

General Difference Between Gel and Wet Batteries

State of Charge and Sulfation

Connect Your Batteries for Optimum Efficiency

Just A Little Corrosion Causes Big Voltage Drops

Don't Be Misled By Battery Ratings

Which Deep Cycle Battery Do I Choose?

Daily Amphere-Hour Consumption For Your RV

Safety Tips on Charging Batteries

Determining When A Battery is Fully Charged

Why Are My Batteries Discharged
  • It is frustrating to find our batteries discharged, particularly in the spring after our boats, R.V.'s, motorcycles, personal watercrafts, etc. have been in storage for the fall and winter.


  • With a little maintenance and information, you can avoid the frustrations of "discharged batteries" and the cost of buying new batteries as well.


  • Did you know that a battery starts to discharge once it is filled with electrolyte. Here in the Northwest, most boat and car batteries left unattended (and assuming no "parasitic drains" from computers, etc) will not start the engine after about 3 months. For smaller batteries such as personal watercraft and motorcycles, it takes only about a month to discharge the battery to 75%, which usually will prevent the engine from starting. In hotter climates, this can occur in less time than those specified above.


  • Discharged batteries not only won't start your vehicle but will become ruined and in need of replacement if left without any maintenance. A process called "sulfation" occurs if the battery voltage drops below 12.4 volts or if specific gravity drops below 1.225 as measured by hydrometer. Sulfation actually hardens the battery's internal plates, which need to remain soft and porous so that the electrolyte can flow through them.


  • Monitoring your batteries for these parameters, voltage and specific gravity, can be done easily and cheaply and will ensure maximum life from your batteries. All you need is a voltmeter and hydrometer.


  • Armed with this information you can then determine if you need to charge your battery.


  • For those applications where batteries are stored for over 2-3 months "without use", an excellent option to maintain your batteries are the "completely automatic, complete shut off "chargers that are now available. These chargers have computer chips that sense when the battery needs charging and automatically turns itself on. After the battery is charge it automatically turns itself off and therefore never overcharges or undercharges your batteries. They can be left connected to an AC outlet indefinitely. Contact us for more information.
What is the difference between series battery connections and parallel battery connections and how do they increase battery capacity and voltage?

Jump start procedures

Preparing your batteries for winter

Advantages and Disadvantages of using two 12 volt batteries connected in parallel or two 6 volt batteries connected in series.

Testing the battery