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Battery Tender Lithium 800 Waterproof Charger

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Battery Tender Lithium 800 Waterproof Charger

This compact 800 mA battery charger has all the charge characteristics of its cousin the Battery Tender Junior. It incorporates highly efficient surface mount technology electronic components. The interior is completely encapsulated, protected from shock, vibration, and moisture by an electrically insulating, thermally conductive, flame retardant, synthetic epoxy resin compound. It's tough, affordable, and a strong, innovative battery charging solution.

This charger is no larger than a standard computer mouse yet packs 800 millamps of pure constant current charging power. Coupled with a brain (IC chip), the charger will constantly monitor, charge, and then maintain your battery- even while totally submersed under water! Perfect for all outdoor types of ATV's, watercraft, motorcycles, boats, or anywhere water is a threat.


  • Designed to charge any 12 volt Lithium (LiFePO4) Battery
  • "Supersmart" Technology
  • Spark Proof
  • Short Circuit Protected
  • Reverse Polarity Protected
  • Auto recovery mode for batteries with very low voltage
  • Waterproof
  • Weighs only 1 Pound
  • Listed in the California Appliance Efficiency Database
  • 3 Year Warranty
Product Style RevZilla Item # Manufacturer Product # Availability
12 Volt 869273 BT-TWIN800-DL-WH/0220150DLWH In Stock: Ships within 24 hours


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Battery Tender Lithium 800 Waterproof Charger 4.7 5 3 3
Can't go wrong with this tender Must have if you own a bike.. Great for winterizing if you live in a cold winter city. Great for recharging the battery Great for jumping. Overall is great. November 23, 2015
i feel this is a must have product with battery tenders,my wife and i get very long battery life so this was a great and needed gift for my brother! September 6, 2015
works like it should Bought this a few weeks back before going away for a couple of weeks. Plugged it into my bike, and when I came home she started right up. I really like this charger, especially since it is water proof and my bike lives its off time in a very old leaky unheated and damp garage. I would have given it 5 stars if it had a voltage meter, but hey maybe that is just being picky. July 23, 2013
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Have a functionality, fit, or otherwise product-specific question about the Battery Tender Lithium 800 Waterproof Charger? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Battery Tender Lithium 800 Waterproof Charger
Already Asked: 2 Questions, 5 Answers
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RevZilla Store asked: Why did you choose this?
john r: my wife and I both have a battery tender on our bikes , so, when my brother mentioned his battery was weak due to not riding for awhile because of a job injury, I knew this product would fit the bill perfectly ! May 24, 2015
Celio B: to keep the battery up and ready to go May 20, 2015
Robert R: Waterproof. Want to keep it with the bike. Oct 30, 2014
paul w asked: can you install charger to motorcycle battery, mount it under the seat or on frame,and leave it hooked to the battery so if you need a charge you just plug in to an outlet? Mar 16, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Stephanie Y: No, not enough room. Mar 16, 2014
Reply to Stephanie Good answer? Yes (1) No (0)
paul w: thankyou for your quick response Mar 16, 2014
Michael M: I'm no mechanic, but I imagine it would work in theory. It's meant to have just the harness attached to the battery terminals at all times and then connected thru the little "pigtail." On my M796 it nestles in between the gas tank and frame and is easy to grab and plug in. Unless you are away from home for extended periods I wouldn't see the benefit in attaching the whole unit since it's actually pretty heavy for its size. You certainly wouldn't want it to jostle free when you're riding and have a cord get all tangled up in your chain or wheel. Mar 16, 2014
Reply to Michael Good answer? Yes (0) No (0)