12V 5 Amp Automotive Smart Battery Charger Maintainer for Car, Motorcycle, RV, SUV, Lawn Mower, Boat, RV, SUV, ATV and More

Works very well and easy to use. Portable so it can go anywhere that there is an outlet. A must for women and teenagers.

I had a battery go dead and looked into a jump start option to plug in as I didn't have another vehicle to hook up to for a jump. Well turns out there are few that can do a jump start that you plug in and they are a bit pricey. The way big batteries work and the type of power they use, it is more complex or not a simple thing to take the power from your wall outlets over to a device to jump start your vehicle. I didn't know that until I went looking and reading to learn about it.There are battery powered ones to jump your vehicle, but you would have to maintain them to have the power on standby to do it. I have only had a battery go bad every 3-5 years, and so wanted a device I can plug in to get a jump start if I need one. From what I read on the high priced ones that can do that, they only last a few years, so there would be a chance they would not work when I needed it.That is why I decided to go with this charger / maintainer, it will take over night or 10 - 12 hours or more to charge your vehicle battery with this to get it to turn over and start. But, this little device can sit on your shelf for years and then when you need it, you have it. If you have a emergency or need a fast jump this won't do it, but you can also use it as a maintainer to keep a battery charged, but it will have to be left plugged in and your vehicle hood left up. Such as to use at a vacation home, etc.This was the lowest priced one I could find with the smart technology to monitor the charge and keep things as safe as can be with a more hands off approach. It is not super simple such you could just do it having not read the directions, but there are no such options that easy.You will have to read up on how to charge a battery and or maintain it and become more familiar with it all to both have your battery charged proper to use it and to be safe. As it seems if you over charge your battery it can ruin it or it may explode (I am not sure).All this is why I went with this device, as I can read the directions again in the future when I need to use it and it is simple enough to then charge my battery and go about it smart and safe, so I can start my car the next morning to get to auto store to get a new one if needed.

Works perfectly

Someone left the key in the on position all winter and the lawn tractor battery was dead. I read the few pages in the manual written in English and was a bit confused which “mode” I should use. When I connected it to the battery it immediately went into repair mode. After a few minutes I thought I would just change to charge mode. Well, the battery was so completely empty it reported it could not charge. So, back to repair mode and I left it for 24 hours. When I returned to check the status it displayed “End” which I read means repair is complete so I changed the mode to charge thinking that would be the next step. After 10 minutes it reported battery was full. It worked! Lawn tractor started right up and the battery is alive again. It was so easy and the charger worked great!

I purchased this charger to be part of a battery backup system to power all of the critical electronics in my house. ie. my DISH Network receiver, Comcast router, NVR camera server and network switches.My system is to be comprised of one 2500 Watt Pure Sine Wave Inverter with Transfer Switch which will allow all my BBU gear to operate from the grid until there is a power failure just as a standard battery backup unit would.The inverter is powered with a Kepworth 12.8 volt 135Ah LiFePO4 battery for which I was planning to use this 6 Amp charger to keep it topped off and ready for power failures.Only after hooking it up, did I find out exactly how it works which is not explained anywhere I was able to read before purchasing. I will explain as follows:The "Cons"1 When connecting it to the battery and plugging it into the 120Vac outlet, the unit powers up to the last "Mode" it was set to. Which is good that it remembers that and won't change unless you press the "Mode" button.2 By pressing the mode button, you can select from one of four modes. The instructions said to connect my 135Ah battery to Mode 1 (Lithium) because the LiFePO4 mode is for smaller batteries only.3 With the battery connected, the display continiously sequences through all of the data readouts as Voltage, Charging Current, Temperature and Full, when charged. The "Mode" button only affects the battery charging type and is disabled while the unit is charging preventing you from changing modes in the middle of a charge cycle. It also has a five bar charging status display to the right which show the charging progress. That seems to work well.4 The "Temperature" reading is fixed in Celsius and as far as I know, can not be chaged to Fahreheit. Making its readout useless to me but not a deal breaker. Perhaps they make a US version that I did not see.5 However, this was the deal breaker for me: When the battery is fully charged, the charger says "Full" and disconnects itself from the battery. The unit is still on and indicating "Full" but as the battery drops in voltage, it will not reactivate back into charging mode until you cycle the 120Vac power cord.For me, that meant that when the battery gets drawn down by the inverter producing 120Vac, the charger will not operate to float it while it is draining. Plus, the LiFePO4 battery has what is called BMS (Battery Monitoring System) circuitry inside which manages the charging and low voltage cutoff points. Which means when the battery gets to 10.8Vdc it shuts off to prevent the battery from going completely dead and damaging the cells.6 If I connect this battery charger to the grid side power, that would provide a work around for this problem as when the power fails and then returns, the charger would get the power cycle and will restart to charge the battery again.However, the inverter draws a small amount of current when in standby mode which after several days drains the battery down and the charger will not automatically come back on without a power cycle. So I expect that the battery would die and not power the inverter when the power fails. Of course when power returns the charger would then be recycled and begin to work again.However, if the power fails with the battery down to 50%, I would only get half of the standby time I would expect.7 I have not hooked this system up in that fully working configuration yet, but I figure it should work as I theorize which is not going to be a 100% solution to my operational endgame.8 I am not yet sure if I will keep this unit and I am researching for a replacement but none of the product descriptions of any chargers I have found answer any of these questions in advance of purchasing. So I may be stuck playing the hit and miss Amazon purchase and return game to find a charger that will behave as I need.Perhaps I will just need to purchase a straight 13.7Vdc battery charger without the fancy built-in analyzer circuitry and just rely on the battery's internal BMS circuit to regulate the charging cycles. If anyone out there would know the answer to that question or perhaps another solution, please respond to let me know. Thanks!9 It would be nicer if it had about a foot longer battery cable length, but not a deal breaker. However, I will have to cut off the nice alligator clips to put on hoops to fit my screw battery terminals.The "Pros"1 The unit seems very well built and very easy to use. It charged my 135Ah Lithium battery when it shut off at 10.8Vdc and brougt it back to full charge (wil no load on the battery) in aout 5 hours. I never saw it go above 4.2 amps when charging and stops at 12.8Vdc. But that was probably controlled and cut off by the internal BMS circuit.2 It does everything the descriptions says, just does not explain how or why.3 If you are purchasing this unit for strickly one time charging of dead batteries, this is exactly what it is intended for and not what I am trying to make it work for in my unique application. I have no problem recommending it for that.I hope this helps a litle more than the manufacture's description.

Great product. Fast shipping!

I’ve used it 3 times already (mainly bc I refuse to get a new mower battery). It only takes minutes to charge my mower battery, it’s easy to use and it’s compact. Perfectly packaged and on time delivery.

These work great as a compact charger and are extremely easy to use. I have used these on everything from large car/truck batteries, down to smaller feeder 12v batteries.As long as the battery isn’t completely bad, the repair option seems to work, it just takes time.I have bought three of these to keep in various locations and have even gifted them.