Battery Tender 800 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 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!

Excellent charger for the money. Comes with 2 ways to hook up to yor battery, alligator clips, and sae plug. My motorcycle already had the plug installed on it from the previous owner so I guess I have a spare. Weather resistance is a plus as my bike stays under a cover parked under my carport, but when there's gusty winds and rain it does blow in, so being weather resistant helps. Once you install your choice of hook up, it's just a matter of plug and play. Very easy. Remeber to set for lead acid ir lipo battery, another usefull feature as I plan on upgrading to a lithium battery in the near future so I don't need to buy another tender/charger. Indicator lights let you know what type of battery is selected, and when the charger is charging. It's made very well and pretty heavy for it's size so I expect it to last for years to come. Also comes with screws so you can mount it to a table or wall. Very happy with my purchase.

Great product. Works perfectly. Happy with this purchase.

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 have 3 battery tender Jr.'s. They work very well, this one works but for the extra price of it being waterproof it does seem to be a little bit lacking in a couple of features. So it's water proof, meaning they should know it is being used outdoors where electrical outlets can be hard to find, and on non conventional equipment A little longer lead from the battery to the tender would have been nice. I see that you can buy an extension for this but why should I, they know what the intended use for the product is and seem to know that the cable is too short otherwise why sell a longer one? Also my tender Jr.'s have three lights to show stages of charge, why only two on this model? It starts out sort of amber but that can be confused easily with a green light when viewed in sunlight, then green. I do prefer the red upon initial plug in, then amber and then green when fully charged. It sounds a little picky but I liked the way my others work and got used to them. Why change a product that worked fine? Bottom line is it works as intended.

The battery in my Mustang would not stay charged this past winter while under a car cover in my driveway. After a month and a half of sitting in the cold NJ winter weather, I would need to jump start it. The last time this happened, the Mustang's window would not roll down slightly (as it normally does when I open & close the door) and stayed in the up position. Because of this, I could not close the door properly without connecting a jump battery to it. I needed an inexpensive, small, weatherproof battery tender that I could set up under the hood of my car to keep the battery charged. This fit the bill. I've only used it for a little over a month now. I ordered this right after a long drive to charge the battery up and installed it immediately. I set it on top of the fuse box under the hood, twist tied it to a cable to make sure it stayed put when I closed the hood and ran the plug to the front bumper thru the hole for the hood latch. Then I plugged my exterior grade extension cord under the front bumper keeping it from getting directly rained or snowed on. After connecting all the cables, the Battery Tender told me it was charging. I closed the hood and covered the car and it sat that way for at least 5 weeks. This past weekend I took the cover off, removed the Tender and started the car. It worked great. When I opened the door, the glass rolled down slightly as it should. The car cranked stongly a few times and started with no problem. The battery was charged just as it should be. I'm very happy with this product and would recommend it to anyone with a similar situation.

Works extremely well with no issues. Read how to set type of battery. You need to do this whenever you hook device to new battery. Don't have to do this if it is installed or left on a battery.

Very well made and easy to use.