800mA Waterproof Battery Tender

Part Number 66000004




This waterproof, fully-automatic charger is ideal for both short term and seasonal storage, even if moisture sneaks into your storage area. The three-step charging system constantly monitors battery voltage to bring the battery up to full charge and switches to float mode to maintain the charge over extended periods of time.

  • Waterproof, vibration and shock resistant, battery tender is reverse polarity protected and spark-proof, even when the leads touch
  • Tender features a front panel LED that indicate the battery's state of charge
  • Maximum charge rate of 800mA
  • Typical Recharge Time: 8-12 hours
  • For 12-volt batteries
  • Includes a quick-disconnect 7.5 Amp fused Battery Charging Harness with ring terminals that can attach to the battery screw terminals for easy connection, and a 7.5 Amp fused alligator clip charging harness
  • For use in the United States, Canada, Mexico and South America (except Argentina)

For 12-volt batteries. (United States, Canada, Mexico and South America (except Argentina) Accepts North American Voltage (120V).

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  • Model
  • Waterproof

  • Output Voltage

    12.0 Volt
  • Output Current

    0.80 Ampere
  • Input Voltage

    120 VAC @ 60 Hz
  • Maximum Charge Rate

    0.80 Ampere
  • Recharge Time

    8-12 hours
  • Warranty

    3 year manufacturer's warranty – Go to for full details
  • Sold in Unit

  • In The Box

    Quick-disconnect 7.5 Amp fused Battery Charging Harness with ring terminals and a 7.5 Amp fused alligator clip charging harness
800mA Waterproof Battery Tender is rated 4.7 out of 5 by 23.
Rated 5 out of 5 by from Great product I haven't had an issue with this. Only reason for buying this second one was because the other one was hit by lightning. I had that one for 3 yrs. Same exact one. Love it.
Date published: 2017-05-02
Rated 5 out of 5 by from 800a waterproof battery tender I like that you can leave it on your battery or use the clips. have it on my bike now. Thanks
Date published: 2017-02-28
Rated 5 out of 5 by from great product I have three HD battery tenders, wanted one for outdoors (weather proof). This is just the ticket. I use them on other items: mowers, tiller, etc. They are multi purpose and are great for cold winter months when batteries are most vulnerable.
Date published: 2017-02-15
Rated 5 out of 5 by from Perfect battery tender I previously had the cheaper version of HD's battery tender and used it with my old bike. I decided to splurge a little and get the better waterproof one. You never know when you'll accidentally spill something on the area you keep your tender, or when humidity will creep in and ruin the electronics. There's really nothing spectacular about it, but it definitely keeps the battery charged. It appears to be very well made, has two holes for screws so it can be mounted in any orientation, and has plenty of cord for those who park their bike a little ways away from the power outlet. My RGS came with the tender harness already installed, so all I had to do was plug in the tender and plug it into the bike. I plug my bike into this tender whenever I'm not riding it. I look forward to many years of use from this item and many years of life from my battery.
Date published: 2016-12-30
  • y_2018, m_2, d_26, h_20
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.7
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  • clientName_harleydavidson


What is the difference between this tender & tender # 66000038?
Asked by: RoadGlideTX
This Tender is 800mA and the other is 750mA
Answered by: JackOLantern
Date published: 2018-02-14

My battery almost dead .will this charger charge battery and keep it charged. I have a 97 softtail custom

Asked by: camkab70

Is this the adapter I plug it into?

I am trying to figure out where I plug this into. I attached two images of an adapter I found. Is this it?
Asked by: drduke1
Yup that's it.
Answered by: SWThomas
Date published: 2017-01-03

Would it damage the charger to disconnect it from the bike/battery but leave it connected to a/c power?

My son constantly disconnects my tender from my bike but does not disconnect the power cord from the wall receptacle and I' concerned it could damage the charger/tender?
Asked by: pa195400
Hello pa195400 Leaving the tender on will not hurt the battery. I recommend the tenders when bikes will be left for extended times.
Answered by: JohnnieXL
Date published: 2016-12-16

Is this battery charger safe with Canbus electrics

My 2014 883 Iron has a Canbus electric system,will this charger be safe to use while the battery is attached to the bike without affecting the bikes electric systems?
Asked by: QBall
It has been flawless on my 2015 heritage softtail. I have canbus also and the trickle charger connection came on my bike from the factory. This charger has worked awesome for me. I connect this exact charger to my ride while the battery is in the bike (that's how it's made). The instructions say to not turn on the ignition switch while the battery charger is connected, so when it's charging/connected I lock my ignition so it won't accidentally get turned on. I also drape the power cord over my seat so as to not forget to unplug before taking off. LOL. It's a very good charger & has an awesome float feature so as to not overcharge.
Answered by: Marker610
Date published: 2017-06-16
  • y_2018, m_2, d_26, h_20CST
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  • clientName_harleydavidson

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    Prices listed are generally the Manufacturer's Suggested Retail Price (MSRP), excluding taxes and shipping. Prices at local dealerships may vary. All online orders will be fulfilled and shipped by
    Harley-Davidson Motor Company as the agent for the Selling Dealer.