Stanley BC4009 40 Amp Automatic Battery Charger

• 40 Amp Automatic Battery Charger/Maintainer
• Automatically selects charge rate from 0 to 40 AMPS to maximize battery life, charge speed and maintenance
• 3-Stage high-frequency automatic rapid charge with Float Mode Monitoring
• 110 amp Patented Engine Start. Helps start most vehicles in one minute.
• Alternator check provides alternator diagnostics

I purchased this unit to charge batteries for emergency use to power a ham radio station. The charger works excellent and with 40 AMPS starting it can charge super fast. The fan is actually real quite when it runs and the backlit LED display is a plus also. The charger is what I call a true auto charger. It wil automaticly choose the rite amps for the battery and how much it is depleated. There is a voltage checker which is pretty handy also and this thing will even do diagnostics on your alternater -TOTALY COOL. I purchased my unit at lowes because I needed it rite away. If your looking for a safe charger that wont over charge your batteries and is set and forget this is it. It will shut off when done and stores power cable and charge leads on board. The LED display shows how many amps it is using as it charges and easy to read.

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The charger works well enough but it appears to be manufactured by the same Chinese company that manufactures the smart chargers for Black & Decker and Vector, and it has the same problem that the other brands have... a VERY cheap sleeve bearing fan! The fan on these chargers is critically important. If it fails, the charger will overheat and it WILL burn out. I had a Vector do this a few years ago and then a Black & Decker do it a couple of months ago. The very first time that I used this brand new Stanley, the fan started making the dreaded "grinding noise of death". Unbelievable! I am NOT going to pay to ship it back. I can buy a quality 60mm x 20mm dual ball bearing 12v fan for under $10, take the charger apart, and replace the cheap junk fan. For the life of me I can't figure out why the manufacturer can't spend $2 more on a quality fan given the fact that it is so critically important to the charger's survival. This is fairly typical of much of the cheap Chinese crap that is being sold these days. The problem is that there aren't ANY alternatives available anymore, virtually EVERYTHING is made in China and virtually EVERYTHING made in China is built cheap to sell cheap!

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Stored this in the unheated garage until I needed it. When lovey wife left the interior lights on in the Jeep I needed a charger. It was around 32F and after plugging the BC4009 in and connecting to the car battery I get a snowflake symbol next to the clips symbol and no charging. No voltage reading either. Freaked out, this is BRAND FREAKING NEW. Why won't this thing charge my dead battery in cold weather? Thankfully I took a few deep breaths and read the manual where I find out the battery has to have at least two VDC left in it for the charger to know it's connected to a battery. Now I'm quite happy with it. I especially love the ability to wrap the cables up in the housing. No more wire tangle! Much simpler to operate than previous chargers.

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The charger works well and is a good value for the money. The only misleading aspect it the battery boost or quick start. It appears as though it is only a 40 Amp charge for 3 min. There is no higher current boost.

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I carry this charger in my motorhome and use it to charge my coach batteries. It worked well until it died after two years. The description is not misleading as stated earlier. It is a 40 amp charger. The 3 minute quick boost charges at higher current (the description says 110 amps).