MOTOPOWER MP00205A 12V 800mA Automatic Battery Charger Maintainer Trickle and Desulfator

I put this product to an extended test, to determine, if it does what they say. It works better, than I expected. It does have an unusual way it works too. After it completes the first full charging cycle, and goes into Maintain Mode, it will stop charging for 15 minutes, and let battery settle down. The voltage on the battery will slowly fall back down to its own float voltage. 15 minutes later, it will kick back on, with voltage upwards of 14.8 volts, and holds it there, to top off the charge on battery, for 15 minutes. Then repeats this 15 minute cycle setup, as long as it is connected to battery. If a load is applied to battery, the charge cycle is repeated, until voltage on battery gets full charged, then the 15 minute cycle kicks back in. I thought at first, that the battery itself, was causing the cycle, I was seeing, but I tried it on two different batteries, one was a 5 AH, the other a 15AH, and I got the same results. Main thing is, this charger does keep your battery topped off, and ready to use. This is a very good product. And as a note, I wasn’t paid for this review, I am very happy to tell others, when I find a products that exceeds the data, in its description. Read more

Works great and it’s compact ! Read more

Works well, seems to be charging battery Read more

Update 22 June 2024: five down to three was too harsh. It was extremely inexpensive and served well for four years. After searching (endlessly) for an appropriate replacement, I ended up buying another MotoPower unit - their 1.5a version. I figure a device with a little more heft probably won't generate as much heat as this one did, so may last even longer; and it was barely more than what I paid for the first one! Update 19 June 2024: After almost exactly four years in service, The charger died. Wife smelled the acrid scent of burnt out electronics and alerted me to it. It was in use daily for all four years. A while after the narrative below, I had set up a Raspberry Pi to monitor the battery voltage and turn this on when it reached a certain threshold - the backend story is the 2018 Honda Accord has a nasty parasitic draw problem, so it was necessary to alway have it monitored and charged cyclicly. So it was powered on and off from a few times to maybe ten times a day. However, a charger like this is _not_ a complex device; exactly four years of service strikes me as 'planned obsolescence'. So I'm dropping the rating from five stars to three stars. It is not hard to build simple electronics to last decades. There's just no good excuse for a short life - other than to 'encourage' a new purchase. Here's my tale: After a couple of months of driving my car barely once a week during the COVID-19 isolation orders, my 2018 Honda Accord wouldn't start. Tried a jump start from wife's 2002 Honda Civic - still no go. yikes! Got out the decent quality multi-meter I have - less than 8 volts, from a 12V battery. Double yikes! Checked the electrolyte - whoa, one of the six cells had exposed plates. Well, that fairly well explains the very low volts. Topped it up to the line, then tried jump start again...yep, triple yikes. Well, I had plenty of time on my hands being furloughed, so I ordered this little unit. Inexpensive, but it made appropriate promises for what it can do, for what it costs. Ratings good. Some horrible though. Took the chance. At 800mA, this is not going to charge a 500Ah car battery quickly. I hooked it up and monitored the voltage for several days. Weather was rather warm, 80's to 90's F, and I noticed this little device getting pretty darned hot - too hot, in fact. Disconnected it and took off the back plate. Board very hot to touch, capacitor and transformer too hot to touch. Bad design! This thing needs to either be potted with a non-conductive heat sink material for full contact with the inside of the case, or the case needs vents. Period. That much heat will toast those components over time. True - I was asking the device for all it had - to charge a pretty deeply discharged 12V high amp capacity battery. Which isn't _per se_ its intended function. Still though. I decided to DIY. Took a drill and drilled four holes in the back plate, and two holes on each side, see photos. Pretty? Not on your life. Crude but fairly effective? Yes indeed, at least, it allowed _some_ of that heat to dissipate. Eventually there was enough charge to start the car, took it for a long drive, then hooked it up again to see if it would complete the full cycle - which it did after another day. It eventually hit the couple of voltage marks to go into absorption mode, then into float mode. Highly accurate too - 14.19v - still absorption mode. 14.20v - boom, float mode. Repeatable. For twenty bucks, it did what I wanted - and most importantly, what I _expected_ - unlike some of the reviews that complain it took days to charge their battery...well duh! It puts out less than an amp, expecting a fast charge from a slow charge device is just....dumb. That said - please guys - make the 'slotted' sides into real slots, to let some air flow through it. I realize it adds a little to the manufacturing costs, but people will get a longer life out of their (admittedly tiny) investment in this - and maybe fewer will die out in the field, eliciting bad reviews. As for me, I'm very happy with it - because it met my expectations. Read more

They went to work immediately. Each time I have needed to use my lawnmowers, they have started! The batteries have been going dead on my lawnmowers after just a few days of not using them. I am tired of that and hopefully these will last a while. They were easy to set up and I love the quick and easy way to read them with no digital readout. Read more

For the price this has turned out to be a pretty good battery maintainer. I installed it on my mini excavator since it gets limited use. The battery has been topped up correctly to an optimal float voltage, and after testing the battery with a Midtronics tester, it shows better State of Health (SOH) on the tester after I let this maintain the battery over the course of a week. is this super high quality? No. The charger seems decent, but the clamps are ultra cheap. I used the ring terminal connector which was better quality. I wouldn't want to attach and detach this from various batteries as I'd see the cheapish clamps failing pretty quickly. I could be wrong, but my gut tells me I'm probably not. Read more

In my barn, I have a classic car, 2 riding mowers, an ATV, and a snowmobile. I bought 5 of these, and they all work perfectly. The snowmobile was the worst. It’s very big with a car engine in it. I would need to charge the battery after every ride. If I forgot, it would not start. But now it starts every time. I thank my friend for telling me about these. Read more

This works wonderfully! The shipping was quick and packaged nicely. Everything came as described. It was easy to understand the instructions as well. I would recommend this. Read more