I purchased this charger for use on many types of batteries I own; automobile, motorcycle, garden tractor, deep cycle etc. It has worked flawlessly on every battery so far, even bringing a deep cycle battery I thought was hopeless up to full charge. It works far better than any charger I have owned in the past, and I have had quite a few.
I cannot comment on its long term durability since I have only owned it for a couple of months, but it does what it advertises and does it well so far.
If there was a rating less than 1 star I would have given it to this charger. I bought this to charge my 6v RV Batteries. Wanted to charge each separately to help equalize them. I disconnected the batteries from the coach and proceeded to charge the first one. It initially said 65% charge. I started charging at 12 amps for about 30 minutes. Then I changed rate to 30 amps. It charged for about 2 hours but display did not change from 65% So I unplugged it and plugged it back in... Now it said 69%. I then set it to 30 amps and it started increasing charge percent every few minutes. Got to about 77% and sat there.. A couple hours later I checked on it and it was off. I tried unplugging and replugging in but nothing on the display. I noticed the transformer seemed pretty warm so I let it cool down. After cooling same result... DEAD CHARGER. So it appears this charger does NOT have a thermal shutdown if it gets hot... it just dies! I also noticed when it WAS working that it would increase the voltage to about 7.5v and then the percentage would go up one point, then the voltage would go down to 7v. It seemed to cycle this way until it does the 'lockup' everyone is talking about here. I do not recommend this charger.... unreliable
I have only used it once when a vehicle had not been started for a long time and the battery was nearly dead. After a few hours it had charged the battery enough to start the engine. The engine start feature was not strong enough to start the V6 engine initially.
I've had alot of Battery Chargers but this one is very superior to all the others. I was told by a friend about this charger that he had bought and brought it to the campgrounds where we store our RV's and boat. I charged the Optima battery for four hours before it came up to 100% charged. My other charger wouldn't bring it up that high. I've only had one experience with this charger so all I can really say about it.
Purchased this after having problems getting my car to start. This didn't find that the battery was bad right away but to be fair neither did the tester at [auto parts store], when I first brought it in. I had to take it back in a few days later for them to charge it fully and then determine it was bad.
I have used it several times since for charging and once for a jump start, always working as expected.
I would stay far away from this charger. I bought one and had to return it six weeks after i bought it. The clerk who gave me a replacement told me that they get a lot of returns on this product. The replacement lasted me about 6 months before i noticed that it only charged the batteries to about 67%, then it would quit charging. Although this charger has nice features, it is not worth the money I wasted buying this.
I bought this charger from Sears. I have the DieHard Gold version. I have used it for about 2 years now. It has worked perfectly.
I did some testing with a almost full standard lead-acid battery and a digital multimeter. It does indeed appear to have three stages.
On the 10 Amp Rapid Charge setting:
- After pressing the 10 Amp Rapid Charge setting the charger is putting in about 900 mA. I don't see much movement on the voltage. I think its checking the battery.
- Next it jumped up to 16 volts and about 3 amps. The battery percentage on the charger quickly increased by 1%. Then the charger started reducing the current. It went from 3 amps, 2 amps to 1400 mA within a few seconds. It looks like its monitoring the time it takes to charge. If it goes too fast it reduces the current.
- The charge complete light comes on when the voltage drops from about 16.00 volts to between 15.90 volts and 15.95 volts. On my multimeter.
- After the charge complete light comes on and 100% is reached. The charger is still charging, but on the top-off stage. I was showing a current input of 1400 mA while it was reducing the voltage to 13.15 volts.
- Once it dropped to 13.15 volts the charger cycled between 13.14 and 13.19 volts. It did this about 4 or 5 times, Each time it would reduce the current until it took about 30 to 45 minutes for it to go from 13.14 volts to 13.19 volts.
- The float charge for me showed it charging the battery at about 20 to 30 mA. It starts at 13.14 volts and charges until 13.19 volts. Shuts down until the voltage drops to 13.14 then starts over.
Note: All numbers are based on my multimeter.
Because its a smart charger it does have conditions that a dumb charger would not have.
Its best if the battery is disconnected from any load, or removed from vehicle or vessel. With any computer controlled vehicle or accessory their will be a minor current draw even with everything turned off. Larger phantom current draws it appears to fault out the charger. Best to disconnect or remove battery if possible. Second, the battery needs to be hooked up before the charger is plugged into AC power. Battery first, then plug in charger.
In summary, this charger has worked perfectly for what I have needed from it. I do solar, and long term vehicle storage. I have some AGM batteries that this charger can properly charge. This is a real deal smart charger that I can leave my batteries hooked up to long term without worrying.
Charger Humms very loud and has a fan motor you can hear running from one end of shop to the other returning.