12V 800mA Battery Charger Maintainer

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.

The unit is easy to install and I really like that there are 2 removable "connection" options. One option is the "old standard" Alligator Clamp Cable which clamp on to the posts for anny battery and must be put on and removed every time the battery is charged and then used. The other option, Ring Terminal Cable, is great for AGM batteries (as on my Cub Cadet ZTS mower) because the leads are permanently connected to the battery (fused line) and you just pop off the protective cap and plug it into the charger cable. The ring terminal cable is easily secured with zip ties so it doesn't flop around or get caught on a moving belt or pulley.I am anxious to see how it handles all the functions they describe (I will update my review after using this unit for a while-An all-weather battery charger, battery maintainer, trickle charger, and battery desulfator.

Works great and easy to use. the Indicator light for charging makes it dummy proof. Small and convenient to store. my Motorcycle Battery is very happy.

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.

Works perfect. Was looking for an inexpensive, basic trickle charger to keep my son’s small pit bike battery charged while it’s not being ridden (Honda crf110). Ordered it, it literally came an hour later. Alligator clamps are nice and strong, no issues connecting it to the small terminals. (It does come with standard battery tender style quick connection you can put on) It did as the instructions said. Went solid red for a couple hours to charge, then flashed green which is 90% and eventually went to solid green fully charged. Battery tester shows it’s fully charged. 👍

fantastic, able to charge and keep it charged when not in use

I have a total of 8 of these tenders on everything from mowers, ATV,UTV, as well as my stand by generator and they work very well, it prolongs battery life a very long time well worth the money

Works Great - Good Price too