Battery Tender 021-0144 Battery Tender Plus 6V Battery Charger

Battery Tender (2010-03-07) Rating: 5/5
Product worked just as expected! Fast shipping, no problems. BEST price on the net! Everything needed in one package!
Just Bought My Second One (2010-03-06) Rating: 5/5
I bought my first Battery Tender for a BMW M3 that I drive infrequently because of travel. The car uses a lot of power even when turned off and idle. After having to replace a dead battery my dealer suggested that I purchase a charger to keep my battery in good shape. I believe BMW sells this unit under their logo, but I bought it from Amazon for much less $$$.

Problem solved! Even after a one month long business trip my car started immediately. Seeing that green light on the Battery Tender gives me peace of mind that my car will start when I need it and my battery will stay in good shape.


When my wife's Honda S2000 would not start after sitting in the garage for a few months, I thought I would try my Battery Tender before calling AAA. After an overnight charge the car started right up. After an additional 24 hours the green light was constant telling me the battery charger was in maintenance mode. My wife asked me to buy one for her.

One Note: find out if your car can charge via the cigarette lighter. This seems to be the most convenient method. BMW 3 series prior to 2007 can charge this way but newer models cannot. The Honda 2004 S2000 cannot charge via the auxilliary socket between the seats, so I installed the terminal set directly to the battery.

This device works, is solidly built, and is a good investment.
Does the job! (2010-03-04) Rating: 5/5
Easy to use, easy to set up. The little green light indicates it's happy, too.
There's no way to know, of course, whether it made a difference since the alternative was to disconnect my '96 BMW M3's battery.
Don't bother with the cover. As noted elsewhere, the package it comes in is suitable for storage.
Must have if you own a classic car (2010-03-04) Rating: 5/5
All I can say is that it works great and I love the adapter that allows you to charge your battery without opening the hood each time. I use this on my 67 Caddy which I don't get to drive at all 6 months out of the year.

Deltran Battery Tender Plus fills the bill (2010-03-02) Rating: 5/5
I have a garaged car that only gets driven a couple of times of month at a weekend home. After about the 5th time of jump-starting a dead battery, a friendly neighbor/garage enthusiast informed me about "battery tenders." After reading the reviews here, I pulled the trigger on the Deltran Tender Plus, and am very happy. I hooked up the ring terminal harness in about 2 minutes and started the charge at around 8PM. Red light stayed on overnight, and by morning the green light was flashing and the red light was off, indicating an 80% charge. Getting to the steady green light with red light off(full charge and trickle maintenance) took another 6 hours or so.

Using this could not be easier, and it is tailor made for someone like me: garaged car over winter with sporadic use and night time temperatures in the 20s and 30s. My only quibble is that the ring terminal harness cord could be about 2 feet longer (it's only 1.5 feet) to allow the charge cord to be snaked through the car's front grill and capped when not in use. I did not use the included alligator clamp harness and will keep it as a backup. Because I have a power outlet in the front of my garage bay, I needed no other extensions on the power cord, or on the charging cord. I would guess that the fully extended outlet cord plus the DC charging cord, plus the DC ring terminal harness, extends about 12 feet total, so that should give you an idea of whether you will need any extensions (either power cord or DC cord) to reach your battery. I briefly considered buying the separate cigarette lighter adapter to charge, but because the lighter on my car is not "hot" when the car is off, it could not work.

For all of the technical reasons previously reviewed, I feel confident that the battery tender will now maintain a float on my lightly used car battery and there will be no more jumper cables in my future!