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Duraboost Battery Maintainer 750

The DuraBoost Charger/Maintainer 750 is perfect for those wanting to charge and maintain their 12v lead acid battery. It constantly monitors your battery voltage and if it falls below 12.8V, the charger will charge the battery at a constant 750mA until the battery is fully charged (13.6V) and then turn itself off.


  • Checks for proper battery connection polarity and for internal battery damage
  • Automatically switches from charge mode to maintenance mode
  • Red LED light shows when charging and changes to green when fully charged
  • 0.75 amp charge rate
  • Overcharge and Short Circuit Protection
  • Includes SAE quick disconnect battery lead and SAE Alligator clip lead
  • 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
4.6 / 5.0
274 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Bang for the Buck
5.0 / 5
Would Purchase Again
4.2 / 5
Ease of Install
4.6 / 5
4.4 / 5
Ease of Use
4.7 / 5
Quality of Material
4.6 / 5
Would you recommend?
Yes (9)
No (1)
Battery maintainer 750
I have four batteries that need to be maintained. Two motorcycles, a lawn tractor and a generator. I'm aware of maintainers that can simultaneously charge multiple batteries but I can't locate all four close together and I don't want to remove the batteries. The quick connect pigtail provided makes it as good as it gets when you want to use the device the battery is in. You can move one maintainer on a rotating basis to multiple batteries if so desired by buying or building additional pigtails. The plug is a common trailer connector item readily available. I purchased two Battery Maintainer 750s. With a total of three battery maintenance devices I only have to swap rarely as I ride one of the motorcycles quite frequently as long as there is no snow which is most of the winter where I live in SW Washington. I've only used the two new maintainers for two days but have observed them to stop charging as designed when the battery reaches a specific voltage. I believe the Battery Maintainer 750 is a very good value for the money.

PROS: Very Compact Maintainer, Quality Wiring Provided

CONS: Have found none

October 2, 2014
Just What I Wanted
I bought these to keep the Batteries in my 4 wheelers and lawn tractors on out property ready to use and these were just what I was looking for at an absolutely great price. I have just started using them but they brought all the batteries right up to full charge.

PROS: price, Size

December 1, 2014
Works better than other chargers I have
It's quite a good deal. I really like the colored led's that show exactly what's going on. The only problem I couldn't find much information on what the lights meant. What I determined is the red light means it's charging, green means it's fully charged and quits charging until the red light comes on for a short time to top it off, then back to green, etc. Seems like a good way to do it.

PROS: Does what they say

CONS: none

August 27, 2013
Easy to order
These are great to prolong your battery life!
March 7, 2015
Does the job
It is lightweight and easy to use. At first use on a partially discharged battery it was flashing red. Instructions did not explain what this meant. It later turned to solid red and then the next day to green.
Definitely a slower charge than the 'Battery Tender' by Deltran. The cables are definitely inferior quality. For a few $ more the Deltran Battery Tender Junior is probably a better value but this is adequate for the scooter I use it for.

PROS: Harness Clips Included, Compact, Easy to use

CONS: Harness Short, Instructions minimal

January 3, 2013
Great product!
I own two of these chargers now. The first one worked well so I bought another. Does exactly what I bought it for: it keeps my battery charged between rides.

PROS: Works as advertised

CONS: None so far

February 4, 2015
works OK
Does what it is suppose to. really good sale price !
November 21, 2014
I would recommed this product
This product is easy to install,great that they give you 2 different hook ups,1 you can mount to your battery and tuck under your seat when not in use and the other with clips.
September 30, 2012
everyone needs one
Great price. Works like the more expensive models. Bought two, one for a gift.
January 3, 2013
Does the job
Good for the black Friday price. Had it on my bike and it kept it fairly charged even with a week battery. Sold my bike and use it on my Miata while it's in storage now.

PROS: Easy mounting

CONS: Could Use A Longer Cord

January 3, 2013
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Browse 6 questions Browse 6 questions and 13 answers
What does flashing red light in the middle mean?
A shopper on Jul 30, 2016
What does it mean if it flashes from green to red? Does it mean it is maintaining the battery?
A C on Dec 29, 2016
BEST ANSWER: If you read the owners manual that came with the product, it shows the battery will flash from red to green when it is in maintaining mode. The time between the battery going from green to red, shows how strong how battery is and how long it can hold the voltage before needing the charger again
What does it mean when there's a red light in the middle?
A shopper on Jul 10, 2017
BEST ANSWER: The red indicator light verifies your charger is connected, since there is no needle gauge. Very visible in low light.
Can you use extension cord with maintainer?
A shopper on Jun 21, 2017
BEST ANSWER: Absolutely. This doesn't pull much amperage. I put a few on a power strip in fact.
What does it mean when the light flashes red and green on the Douro boost 750?
A shopper on Jun 16, 2017
BEST ANSWER: When the indicator light is red it is charging your battery. In the green state it is fully charge to optimal performance.
How long can I leave it plugged in? Will it drain my battery if I leave it plugged in once it is charged?
A shopper on Nov 3, 2017
BEST ANSWER: You can leave it plugged in indefinitely. It will charge the battery to the correct voltage. If it detects a drop in voltage it will activate and recharge the battery back up. It will not drain the battery at all. It will maintain it where it supposed to be. I leave mine plugged in year round.
Product Style Item # Manufacturer Product # Availability
Duraboost Battery Maintainer 750 1128118 TE4-0237 In Stock: Ships next business day