Megaboost Pro Series 4000 Charger And Maintainer

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Megaboost Pro Series 4000 Charger And Maintainer

The MegaBoost Charger/Maintainer 4000 is perfect for those wanting to charge and maintain their 6v or 12v lead acid battery.

  • Diagnosis: Checks for proper battery connection (polarity) and for internal battery damage causing a short. Detects the battery voltage (6V or12V). Tests the battery to determine whether it is good or dead.
  • Bulk Charge: For 6V battery: Charges with constant current of 2A. For 12V battery: Charges with constant current of 2A or 4A (Determined by user).
  • Absorption: Using a constant high current for extended periods of time increases the risk of damaging the battery. To help eliminate the risk, a constant 1.5A (rated) low charging current (output) is given until the battery is fully charged (13.6V±0.2V), then the output is turned off.
  • Maintenance: The charger monitors the battery voltage. If the battery voltage falls below 12.8V±0.2V for a 12V battery or 6.2V ±0.2V for 6V battery, the charger will restart output to charge the battery at about 1A current until fully charged then the output is turned off. The maintenance charging cycle is repeated to keep the battery in good condition when it is not in use and enables the charger to be left connected indefinitely.
  • Recovery: Use the Recovery Mode for 12V batteries with voltage lower than 8V (the battery should not be completely dead). Recovery Mode charges at a constant 1.5A (rated) low charging current (output) to recover the battery. The recovery process terminates when the voltage reaches 10.5V ± 0.25V, and then it switches over to regular charging mode.


  • Fully Automatic - Detects 6v or 12v battery and switches from "charge mode" to "maintenance mode" when the battery is fully charged
  • Easy to read LED lights indicate power on, 6v or 12v mode, 2 amp or 4 amp charge rate, and battery charge status
  • 2 amp charge rate for 6v battery
  • Select between 2 amp or 4 amp charge rate for 12v battery
  • Overcharge and Short Circuit Protection
  • Includes quick disconnect Battery Terminal and Alligator Clip leads for ease of use
  • Safe for use on all 12v Lead Acid type batteries including, Conventional Flooded (wet), Factory Activated Maintenance Free (MF/FA), Absorbed Glass Mat Maintenance Free (AGM), and Gel (Gel Electrolyte) type batteries
4.4 / 5.0
91 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I have 3
I purchased three of these when they were on sale for $27.99 each. I use them on my four wheeler my boat and my motorcycle. I love that they are easy to use and apparently it work well. However, occasionally, when I plug it in, the red light will flash as though there is an error. I also watched a YouTube video review, and other people have had this same problem. I am not sure why this happens. It is very frustrating and almost makes me not want to recommend this product. In conclusion, this product works well most of the time, but when it doesn't is very annoying.

PROS: Cheap when on sale

CONS: 4 Wheeler, Boat, Sometimes Does Not Work, Mc

November 25, 2014
Junk, garbage, don't waste your money.
I have battery maintainers that are 15 times older than this one and still working. The Pro 4000 is junk. It failed at a year. I would not waste a dime on this thing. No manufacturer support and retailer did not care once of the shelf.
Buy a different brand, I regret this purchase.

PROS: none

CONS: Failed At 1 Year

BEST USES: Nothing, Shelf decoration
September 2, 2015
Works well, everything included
Good product. Got it on sale for cheap. Everything was included to get it installed. Not all chargers come with a harness that installs on the bike. This one did. Good product.

PROS: Charges fine, Everything included

CONS: none

February 14, 2013
I was in a pinch when I needed a charger. Cash was tight and time was short for options. I caught a ride to the local CG and went with the recommendation. I couldn't have been happier with the purchase. And the icing on the cake was the cable that came with it that goes straight on the battery. So next time I forget to take my key out, I can plug the charger directly to the cable to make things infinitely easier.
June 30, 2013
Easy to use
Works like it should.
June 30, 2013
The Charger even works on car batteries.
The battery charger is simple to use and it keeps your bike ready to ride.

PROS: Easy to use

Great product
Easy to hookup and unhook

PROS: Easy to use

January 2, 2013
Good tool to keep ur battery charge
pretty easy to use just connect and either use 2hr charge or 4hr charge for slkw charge.
June 30, 2013
2nd time around
Small mountable charger, went out after ten uses but was replaced promptly by cycle gear

PROS: Nice Charger With Accesor

CONS: Stopped Working After Usi

August 10, 2013
Only worked on 1 out of our 5 bikes ...
We have 5 bikes: a 2011 R1 with an 11 mo YUSA battery, 2011 ZX10R street bike with a4 yo YUSA, 2011 ZX10R Race only bike with a 3 yo BikeMaster battery, a 2006 TTR 125 with a 3 yo WPS battery & a 2007 TTR 230 with a 2 mo YUSA battery. I had previously purchased one of these to use with my R1, and it worked with the R1 with no issues. So I got one for my boyfriend for Christmas to use with the other 4 bikes. It started off working with the TTR 125 with no issue, but would not work with the TTR 230 or either one of the ZX10Rs. After a month, it wouldn't even work with the TTR 125. So we took mine off of the R1 and tried it with the other 4 bikes ... mine wouldn't work on any of the other bikes either. Keep in mind we have a Battery Tender brand tender and a YUSA brand battery tender as well and both of those work flawlessly on ALL 5 of the bikes.

We have no clue why but the end result is ... the only bike of ours that it worked with reliably was the R1.

PROS: Cheap when on sale

CONS: not reliable at all

February 9, 2015
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Product Style Item # Manufacturer Product # Availability
Megaboost Pro Series 4000 Charger And Maintainer 1128037 188672 In Stock: Ships within 24 hours