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NOCO Genius G3500 6V/12V 3.5A UltraSafe Smart Battery Charger

by NOCO
4.4 out of 5 stars 1,824 customer reviews
| 138 answered questions

List Price: $74.95
Price: $59.95 & FREE Shipping. Details
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Only 10 left in stock.
Sold by Supreme Auto and Fulfilled by Amazon. Gift-wrap available.
3.5 Amp
  • Enter your model number above to make sure this fits.
  • Charge fully drained lead-acid and lithium-ion batteries up to 120Ah, including ATVs, lawn mowers, motorcycles and cars. Safely maintain all types of automotive, marine, RV, powersport, lawn & garden and deep-cycle batteries.
  • Cutting-edge technology delivers superior performance. Charge 2x faster, repair damaged batteries and use with micro-hybrid start-stop vehicles and CANBUS electrical systems.
  • Streamlined design that's ultra-compact, portable and incredibly lightweight. It features external mounting holes and a rubberized base that avoids surface slipping and scratches, all while remaining impact, UV and water-resistant (IP65).
  • Stay safely connected 24/7. Monitors battery activity for safe and efficient charging, automatically minimizes energy consumption and includes spark-proof technology, as well as reverse polarity and overcharge protection.
  • Intuitive LED indicators provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode.
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21 new from $53.52
$59.95 & FREE Shipping. Details Only 10 left in stock. Sold by Supreme Auto and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

  • NOCO Genius G3500 6V/12V 3.5A UltraSafe Smart Battery Charger
  • +
  • NOCO Genius GC004 10' Extension Cable
Total price: $72.90
Buy the selected items together

Product Information

Size:3.5 Amp

Technical Details

Brand NOCO
Item Weight 1 pounds
Product Dimensions 7.7 x 2.7 x 1.9 inches
Origin USA
Item model number G3500
Manufacturer Part Number G3500
OEM Part Number G3500
Folding No
Amperage 3.5 A
Voltage 12

Additional Information

ASIN B004LWVEKS
Customer Reviews
4.4 out of 5 stars 1,824 customer reviews

4.4 out of 5 stars
Best Sellers Rank #754 in Automotive (See top 100)
#5 in Sports & Outdoors > Sports & Fitness > Boating & Sailing > Boating > Electrical Equipment > Battery Chargers
#19 in Automotive > Tools & Equipment > Jump Starters, Battery Chargers & Portable Power > Battery Chargers
#37 in Automotive > Replacement Parts > Batteries & Accessories
Shipping Weight 1.9 pounds (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available July 7, 2004

Warranty & Support

Warranty, Parts:Parts
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Product Description

Size: 3.5 Amp

NOCO Genius Smart Battery Chargers are some of the safest and most advanced on the market. One of our best, the G3500 3.5A is designed to charge 6-volt and 12-volt lead-acid and lithium-ion batteries up to 120Ah. It can also effectively maintain automotive, marine, RV, powersport, lawn & garden and deep-cycle batteries. It charges 2x faster than ordinary chargers, can repair damaged batteries and is designed for use with micro-hybrid start-stop vehicles and CANBUS electrical systems. Guided by an onboard microcomputer, the G3500 monitors battery activity for safe and efficient charging, automatically minimizes energy consumption and provides redundant levels of safety protection, including spark-proof technology, as well as reverse polarity and overcharge protection. It can remain safely connected 24/7, while its streamlined design makes it ultra-compact, portable, and incredibly lightweight. The G3500 features external mounting holes and a rubberized base that avoids surface slipping and scratches, while remaining impact, UV and water-resistant (IP65). Intuitive LED indicators provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode. Designed for use on 120-volt 50-60Hz electrical systems, the G3500 includes both X-Connect battery clamps and eyelet terminals, as well as a 5-year limited warranty.

From the Manufacturer

battery charger, car battery charger, smart battery charger, battery tender, battery maintainer, 12v
Model G750 G1100 G3500 G7200 G15000 G26000
Power 0.75A 1.1A 3.5A 7.2A 15A 26A
Battery voltage 6V & 12V 6V & 12V 6V & 12V 12V & 24V 12V & 24V 12V & 24V
Cold/AGM mode
12V Lithium mode
Small battery mode
12V repair mode
12V supply mode
12V AGM+
JumpCharge vehicle starting

Customer Reviews

Top Customer Reviews

Size: 7.2 Amp Verified Purchase
This seems to be a great charger! I am using it as a permanently installed charger in a back-up battery-powered sump pump application. I have dual 12-volt deep cycle maintenance free batteries in series for a 24-volt system that feeds a back-up sump pump. It installed in a few minutes but I did have to install different size connectors to fit my battery posts, I configured it in a few seconds, and it has been running fine. This is obviously not designed to deliver high current under continuous operation, but it seems to keep my batteries fully charged and no worries of over-charging. I like the fact that it indicates the percent charge on the batteries, and it definitely shows the drop in charge as the back-up pump goes through run cycles and drains the batteries. I have not had it long enough to vouch for reliability, but it appears to be well made and well designed. As an electronics engineer, I am satisfied with it from a technical and functional perspective.

Update: After nearly 18 months of operation, here is an update that you should be aware of. This charger is very sensitive to power outage glitches, which we get a lot of in our area.
I was wondering what was going on but finally figured it out. The unit charges just fine, but when we get a short power glitch, the unit gets hung up. During a power glitch (lasting a second or two), the unit does not recover. It just sits there with all the indicators blinking. I have to unplug the unit and wait a minute before plugging it back in, then it works fine. I tested this by flicking the circuit breaker on and off quickly, and was able to repeat the problem every time. I fixed it by first plugging the charger into a plug-in surge protector. Works like a champ!
Read more ›
7 Comments 193 of 202 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 3.5 Amp Verified Purchase
I needed a new charger after my old one stopped working. I looked around and saw this one. After reading the reviews i went ahead and ordered it. Right before i got my charger my weekend wheeler truck didn't want to start. So i took my battery to get tested at my local auto parts store and they told me my battery was "bad" and i needed a new one. So i took my battery back home and saw that the charger had arrived and it was the perfect time to test it out. I attached the charger to my battery and left it alone for the night. When i came back out in the morning it was fully charged so i took the charger off and let the battery sit. I checked it a few days later and it was still holding the same charge as it had when i took off the charger. The battery is still holding its full charge two weeks later. This battery charger saved me from buying a new battery when this "bad battery" is still good. I would recommend this charger to anybody who has a vehicle.
4 Comments 224 of 236 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 3.5 Amp Verified Purchase
I have gotten myself 5 of these chargers and plan to get a few more soon. These things are just more then what you can read about. To say the least these truly are very smart chargers. They also do really charge faster then any other charger I have ever used. I use them to charge all our power wheel batteries, I have to/try to keep up with 17 batteries. The kids can wear out a battery and this will have it back to 100% in 2 hours (nap time). All the safety feature are truly a must having these around the kids as well. I recommend these to anyone who owns any type of battery. As far as the charging of power wheels batteries go, make a quick connect you will thank yourself.
7 Comments 138 of 145 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 1.1 Amp Verified Purchase
Pros:
(1)Innovative and well-thought design
(2)Good build quality
(3)Light weight and portable size. Easy to store and carry around
(4)The charger can tell the health of your battery with 'Diagnostics' feature
(5)can rescue or repair 'sick/dead' battery which is deeply discharged, sulfated or damaged.
(6)Owner's Manual& User Guide is well-written and very helpful
Cons:
(1)Warranty service is not free, in fact, it is quite expensive. I think most of Genius Charger owners are not very happy about it when warranty service is needed. Hopefully, repair rate is very low.
(2)The price tag of G1100 is almost $45, a bit overpriced, but good battery maintenance and extended battery life compensate the cost.

I got my G1100 for less than a week. I got trouble when I used it to charge my battery the first time, all LEDs illuminated and were blinking once the AC power was plugged into an electrical outlet. Obviously, it was an error warning. I checked all connections and found nothing wrong. I suspected my G1100 is a bad charger. I looked into Troubleshooting in User Guide before calling NOCO Genius for help. Troubleshooting indicates that my 2 year old battery is in very bad condition as a result of sulfation or damage. COSTCO gave me a free replacement because my old battery is still within 3 years warranty. G1100 saved me $75. I installed the new battery, then charged it again. All 5 charging steps went through as smooth as expected and successfully. It took about 5 hours to complete a full charge (from 25% to 100% full charge). I will update my review when needed. So far, everything is going well with my G1100 charger.
3 Comments 132 of 139 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 3.5 Amp Verified Purchase
I have an AGM battery in my car and I wanted to make sure the charger I bought supports that type of battery. I`m really impressed with the Genius charger. The status lights let you know exactly what the charger is doing. I'd recommend the charger to anyone with AGM or Gel batteries (as well as traditional wet-cell batteries).

Amazon (as usual) had the best price and it was shipped in a timely manner.
1 Comment 121 of 128 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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NOCO Genius G3500 6V/12V 3.5A UltraSafe Smart Battery Charger
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Price: $59.95
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