Battery Tender 021-1163 5W Solar Maintainer

• Built-in 3-step microcontroller for precise charging
• Waterproof and sparkproof for outdoor installations
• Easy, do-it-yourself installation
• Built-in temperature compensation sensor
• 12V nominal voltage 270 mAmps

Charges battery to full, then trickle charges to maintain. My 2005 GTO sits for weeks without being used. I hooked it up and it told me my battery voltage was to low. My battery was junk and needed to be replaced. This will happen to you if you don't start it weekly and let it run for a while,or hook it up to a trickle charger. I installed a new battery and charger keeps it at full charge. This is a very nice product. I don't have to worry about using an extention cord.

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I bought this to use as a battery tender for our boat which doesn't get enough use. I built a mount out of ABS pipe so I could mount it above the boat lift. It works very well, it charges even when the sun is hidden behind clouds and I have not had any dead battery probems since. Having a visible indicator that it is working is a nice feature. It is a good quality product that doesn't seem to be bothered by the weather.

My only complaint is that they (the mfg) doesn't tell you which model to use for a given purpose. That would be helpful.

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I bought this item to keep the battery on my car in shape. The car has sat since December and had a dead battery. The battery was fully charged in a day and I am very happy with how well it works. I would give it 5 stars but the cables are very short. I have a Mini Cooper with the battery in the trunk and the cable could not reach the front seat, if I had to connect in the engine bay I would be forced to buy the extension.

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I purchased a Deltran Battery Tender JR 5 years ago as well as a motorcycle battery. Both the battery tender and the battery are still going strong 5 years later, this is not a typo! Yes, I said 5 years! Anyone who owns a motorcycle (especially a Harley) knows that you typically replace batteries every 2 years. Because of the performance of my battery tender Jr I decided to pick up this Deltran Solar Panel. I recently had to move my bike to a garage with no electricity and had to install the solar panel on the outside of the garage fully exposed to the elements. I've only had it about 2 months but I must say that this solar panel has performed above expectations. We have had some of the craziest weather on record in New Jersey. Warm days, cold days, heavy rains, 50 mph winds, 3 and 4 days at a time without sunlight. Yeah, Mother Nature has been sending us all kinds of craziness. So today I decided to go to my garage and see what kind of mess this solar panel was in. At the very least I expected to find the panel damaged by all the rain we've had. To my amazement it was working perfectly! It was 2 in the afternoon and cloudy due to all the rain and the solar panel LED was green indicating a fully charged battery. The panel has not been hit with any sunlight for 2 days yet it has been able to fully maintain my 5 year old battery. Another great product by Deltran.

UPDATE 3/28/2013: Here we are over a year after purchasing this Solar Panel and it continues to work great. It has been through some of the worst storms on record here in the East Coast without sustaining damage. My "very old" motorcycle battery continues to be maintained. The bike started easily even after 6 months of sitting in storage.

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I purchased two of these for my bikes and have been using them for months. The bike batteries are fresh each time I use them. These are great for storage locations without power. The packaging was good and the products arrived in perfect condition.

The only defect I can see with these solar chargers is that the charging/full indicator lights are located on the controller which is fixed to the solar panel. If the solar panel is mounted on a roof it's kind of hard to see the indicator lights. Battery tender should provide a control unit that can be located remote from the solar panel so that it can be placed in a location where the indicator lights are easily viewable.