Frequently Asked Questions

Q: What is a Battery Tender Charger?

A: A Battery Tender charger is a microprocessor controlled fully automatic charger / maintainer. It is designed to extend the life of any lead acid battery commonly used in automobiles, motorcycles, ATV's, personal watercraft, RV's, boats, airplanes, golf carts, back-up generator systems, etc. Any vehicle or battery operated piece of equipment not used on a daily or regular basis is a candidate for a Battery Tender charger. The advanced technology will bring the battery back to a full charge without overcharging and then float or maintain the battery for an indefinite period of time. The Battery Tender Junior and Battery Tender Plus come equipped with alligator clips and ring terminals for easy hook up!

Q: Who should by a Battery Tender charger?

A: Any person owning a vehicle not used on a daily or regular basis is a candidate for a Batter Tender charger! Batteries experience a natural self discharge of varying degrees. We calculate most lead acid batteries discharge at a rate of 1% per day when not in use. Many newer vehicles have internal systems that require electrical current while not in use to sustain memory and programming features. Thus, over time a battery will fully discharge. Whether it be a motorcycle, personal watercraft, ATV, trailer boat, classic car, performance vehicle, rider lawnmower or RV, a Battery Tender will assure that vehicle will be ready to go when you are! In addition, the number of people who have winter homes in different locations has increased dramatically over the years. They leave many vehicles in storage or unattended for a month or a season!

Q: How often should I use a Battery Tender?

A: Any vehicle not used on a daily basis should be hooked up to a Battery Tender to ensure maximum bitterly life. No matter what time of the year tit may be, plug in the Battery Tender when the vehicle is not is use! This will assure a healthy battery without sulphation or loss of reserve capacity. Even in season, a battery needs to be recharged properly! Higher temperatures accelerate battery discharge more than cold temperatures! A batter stored at 95 degrees F will discharge twice as fast as one stored at 75 degrees F.

Q: How does the Battery Tender work?

A: Battery Tender technology is microprocessor controlled and fully automatic! It is a constant current charge program that does not shut off! After fully charging a battery, the voltage drops to a maintenance / float level at a very low current for an indefinite period of time. If the electronic draw on the vehicle pulls the battery voltage down from an optimum of 13.2V to 12.7V, the Battery Tender will recognize this and automatically go back into a charge mode to keep the battery full charged and ready to go.

Q: If I hook up the Battery Tender when my vehicle is not in use, how much longer will my battery last?


A: A Battery Tender will significantly extend the life of a battery if hooked up when a vehicle is not in use. This is probably the most difficult question to quantify or answer accurately? There are so many factors involved in extending the life of a battery. Weather conditions, environment, and frequency of use all play into the life of a battery. Any vehicle not used on a daily basis is a candidate for a Battery Tender charger. If the occasionally used vehicle is plugged in when not in use, the battery should last from 5 to 8 years. We have actually had customers tell us they are into 11th or 12th year with the same battery! A battery, depending on the area in North America, will typically last an average of 3-4 years. Protect your investment with a Battery Tender for a longer battery life!