Proper use of a Battery Tender should not damage a battery's lifespan if used appropriately. Using it correctly can extend its lifespan by helping keep its charge steady and avoiding overcharging or undercharging issues. However, it does not match the type of battery being charged properly or is misused.

If customers have questions about warranties, they are encouraged to call Battery Tender® support at 877-456-7901. Deltran USA, LLC is a 55-year-old family owned automotive, power sport, and marine product engineering and manufacturing company headquartered in Deland, Florida.

To be safe, assume that the batteries require a full 100% charge after the cells are filled. For example, a 16 Ah battery will take about 13 hours to get to the absorption voltage (constant 14.4 Volts). It may take another 6 to 8 hours to reach the float voltage (constant 13.2 Volts).

If you try to charge a dead battery having a voltage below 3 Volts, the Battery Tender® Junior charger will not start. An internal safety circuit prevents the charger from generating any output voltage unless it senses at least 3 Volts at the charger output.

indefinitely Unlike standard and trickle chargers, a battery maintainer can be attached to a battery indefinitely without any fear of overcharging.

In theory, you can leave the Battery Tender® Plus battery charger connected to a battery forever. That's a really long time. Sales people like to say, “Just plug it in and forget about it!” However, practically speaking, it is a good idea to check on the battery at least once every couple of weeks.

Battery Tender is a brand of products for maintaining a car battery's charge, generically known as trickle chargers. A trickle charger delivers a slow and steady energy stream to maintain a car battery's charge during storage. Maintaining a charge helps prevent damage caused by depleting a car battery.

The normal lifespan of a regular battery is around 5 years. While a maintainer (or tender, if you like) won't extend the life of the battery, it should allow you to get the full lifespan of the battery. Plus, the battery will be completely charged when you go to start the vehicle.

About 10-24 hours About 10-24 hours, depending on how weak your battery is. If you're using a trickle charger, expect it to take days. Don't expect an under-charged battery to do the job of a fully charged one. Take your battery off the charger early, and you may risk needing a jump-start later.

indefinitely Is It Okay to Leave a Battery Maintainer On All the Time? Unlike standard and trickle chargers, a battery maintainer can be attached to a battery indefinitely without any fear of overcharging. This makes them perfect for seasonal vehicles that will remain idle for longer periods of time.

indefinitely Is It Okay to Leave a Battery Maintainer On All the Time? Unlike standard and trickle chargers, a battery maintainer can be attached to a battery indefinitely without any fear of overcharging. This makes them perfect for seasonal vehicles that will remain idle for longer periods of time.

You can (and most people do) leave it connected to your battery all winter, even for years if you need to. Contrary to the popular wisdom, cold temperatures are better for battery storage. Self discharge rate is lower on VRLA batteries, but it's still much faster at +20 than at -20.