Battery Tender800 is a SuperSmart Battery Charger that will Constantly Monitor, Charge, and Maintain your Battery. It's Encapsulated and Protected from Moisture by an Electrical Insulation

I bought this back in 2018. It sits outside in the weather does its job and never complains. It has been a lifesaver. I use it for my truck which doesn't get run a lot. Just remember this is not a charger for a dead battery this keeps a good battery happy and ready to roll.

I ordered this Battery Tender 800 waterproof charger a couple weeks ago and had installed it onto the battery of my mustang that sits for quite a while between starts and drives. Since the battery was at full charge it litterally took a very short time to go into storage mode and do what it was designed to do. Previous to this item I had the Battery Tender Jr that had failed after approx 6 months BUT, in Deltrons defense, I was using it between my jetski and my mustang. I knew it wasnt designed for outdoor use, especially here in the humidity of southwest Florida ( I did have the forementioned items under a carport and the item covered by the jetski seat or mustangs hood). I never blamed the Deltron company and never left a poor review as I was more to blame for using the wrong device for outside storing. I do also own the Battery Tender Plus and have used it inside my storage shed on my RV battery for about 1.5 years now with no problems at all. Though I have not given the BT800 enough time to write a thorough review I realize that thier prodects are above average for the price and wanted to share my overall experience in general with thier products. I can safely assume the BT800 will surpass its expectations as it was desinged as an outdoor product. My mustang does sit under a carport and the BT800 sits under a closed hood where it will never actually get rained on, come in direct sunlight, chemicals, or any type of water outside of humidity. So since its designed for this and even harsher conditions I feel assured it will give me years of practical use. I will come back periodically to update this review as time goes on. I would recommend any of the Deltron products to anyone who plans to use them in the way they were designed!***update 2/1/15***Unit still works perfectly under the stangs hood, keeps the battery charged perfectly so its ready to go when I decide to start or drive it. I still highly recommend this product for anyone needing to maintain a battery that is outdoors!

Works great, definitely worth the money.

Works perfect! No more dead batteries

Nice trickle charger

works good. I use it on my atv and sxs easy to use.

This is a battery MAINTAINER, not a charger. It will charge smaller batteries, and given several days, bigger batteries. Excellent for seldom driven vehicles or machinery, especially mowers, boat cranking and trolling batteries. Modern vehicles have so much 'stuff' with 'parasite' electrical drains, making this a crucial tool if a car sits much longer than a week or so.Main Point No.1 - This is WEATHERPROOF!!!!! Most similar devices are NOT. Handy for those without garages. Note that the terminal clamps convert to 'eyes' for a more permanent install and the cord can be routed out the grill leaving a short length sticking out with a 'plug-in' connection. However the supplied battery end cord is only 18" long and I need to get a longer one (I think I saw these on Amazon). Thus, one does not need to raise the hood every time you hook-up the maintainer.Main Point No.2 - This unit has a brain. It will charge until the battery reaches a pre-set upper limit, the shut off until the battery self-discharges to a pre-set lower limit.Main Point No.3 - The unit will not charge if a battery is really drained, which is my only negative comment. So, have your 'Yard-Sale and Flea Market' folks buy every old-school charger they find and use them to'trick' the modern chargers into functioning.

I use these on several vehicles. Have no issues with tender either being under a hood or exposed to elements. It's only 800ma, so it takes a little time to get bigger batteries up to capacity. It does exactly what you need it to do.