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Your cart is empty.The Battery Tender 12V, 800mA battery charger and maintainer has all the features of our best selling Battery Tender Junior, in a mountable, rugged, water-resistant package. This 800 milliamp battery charger is shock and vibration resistant - perfect for all types of vehicles that may be exposed to the elements. This charger has additional functionality to switch between traditional lead-acid, flooded or sealed maintenance-free batteries and lithium batteries.
Erik
Reviewed in Mexico on February 27, 2025
Excelente y original perfecto para las motos yo lo ocupé para una Harley ultra
Donskiman
Reviewed in the United States on February 13, 2025
I have two of these. One for my motorhome that sits idle for the inter and one for my car that is only driven occasionally. They maintain the batteries so they don't go dead from parasitic draw. NOw I don't have to jump start these vehicles.
Customer
Reviewed in the United States on February 1, 2025
Exactly what I needed and delivered overnight. No complaints easy install.
jason s corey
Reviewed in the United States on January 18, 2025
Easy to use, plug and play. Able to maintain a good charge during the cold winter months
Fred Hammond
Reviewed in the United States on June 22, 2024
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.
Garrett E
Reviewed in the United States on December 18, 2024
I bought this to use on my 74 Gmc to keep the battery charged through winter. So easy to use and small for when it needs to be stored away
Rick Bowers
Reviewed in the United States on November 22, 2024
I bought this little battery charger/maintainer for my 50 year old Porsche 914. It's perfect charger for the application. It can mount of the wall and plug in or clip on to the battery terminals easily. It stays out of the way when its not in use and keeps the battery in tip-top shape when the car isn't driven regularly.
Graham 89
Reviewed in the United Kingdom on June 5, 2020
The reason I chose this one is because the ring wire has the same fitting as my previous charger. That made it an easy swap over.one reviewer stated it came with an American type two pin plug, it's actually a normal 3 pin plug. Also it's completely waterproof.It's more expensive than my previous one, however that failed after 3 years. So, we'll have to see how this performsOverall, very happy.
sue
Reviewed in the United Kingdom on May 6, 2020
Easy to wirin to bike battery. Doing a good job of looking after my bike battery. Pleased with it.
SSR
Reviewed in India on December 7, 2017
Broke almost immediately. Very bad quality.
tygerbard
Reviewed in Canada on October 26, 2017
Purchased this Battery Tender 800 so I could keep the battery charged in my Dodge Caravan. It has worked out to be a GREAT investment. I was able to use the ring terminal harness to attach permanently to the battery cable bolts; then ran the lead down and out through the front grill of the van. It has worked flawlessly, and I haven't had to worry about the van being 'dead' when I need it. I bought this 2 years ago and have been using it continually with absolutely no problems whatsoever, and I'm now also using it to keep the battery charged on my alternate vehicle. It is one of the best purchases I've ever made and it has saved me from having to replace at least 2 car batteries, certainly. And now I don't fret about it, so that's good, too! ALSO: I would like to add that this is intended as a battery MAINTAINER; and while it is not specifically for charging 'dead' batteries, it will do so, if you give it enough time. It takes 3 or 4 days to do it, but it will get the job done. I used it on my Dodge Neon's dead battery; car wouldn't turn over (just clicked) so instead of having to take the battery out of the car and put it on a faster charger, I just used the alligator clamps and my Battery Tender. It worked like a charm, took about 4 days to get it charged back up but since then it has been working just fine (and the battery in question is from 2010...). I have since installed a ring terminal harness and maintain this same battery with my Battery Tender 800.
Randomness
Reviewed in the United States on July 11, 2014
I got this to maintain the battery on my C63 Mercedes which I (unfortunately) am currently unable to drive and which is just idling under the covered parking next to the house, for months at a time. I connected it directly to "jump start" terminals under the hood (the actual battery is in the trunk under the mat - not a very convenient area to access), plugged it into wall outlet on the exterior of our house (the 220V "utility" outlet - this device supports it), routed the cable, closed the hood. The indicator light was glowing "yellow" (meaning it was charging) and then turned solid "green" after a few hours (the charging current of this particular model is small so the process is pretty slow), and I just left it connected after that.Overall I am very satisfied with this unit - it is pretty compact, very inexpensive (especially compared to ridiculously overpriced Mercedes-rebadged CTEK chargers/maintainers), waterproof (I already tested, we had thunderstorm a couple of days ago), fully automatic unit with a good warranty. The only couple of minor drawbacks I can see are that the included cable (the one with alligator clips) is a little bit short (though there's an extension available for extra money, which I already purchased) and that there's no carrying case included. But these are pretty subjective drawbacks and I still highly recommend this unit if you are looking for a truly universal (except for maintaining Li-based batteries), durable battery maintainer. And if you need a unit with higher charging current for faster charging - there are also plenty of these available from same manufacturer.
Justin Evans
Reviewed in the United States on May 7, 2014
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!
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