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Battery tender / trickle charger recommendations?

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    #31
    I reached out to my Antigravity rep for clarity
    2004 Dinan S3-R M3
    2023 X3M Competition

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      #32
      The CTEK doesnt really have a specific maintain mode. You just hook up the battery and leave it connected. I'm not sure if its constantly supplying voltage or just waiting for the battery to voltage to drop then kicking back on?

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        #33
        Why buying another Trickle Charger? I just charge up the batt to full with 6A max power supply or charger (I prefer to use power supply and set the voltage and current limit, over the standard charger), then disconnect the batt neg cable and repeat again every 2 months.
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          #34
          Heyo!


          You can leave the battery on the 12v LFP mode for winter storage. You can also disconnect the battery from the vehicle and let it sit for the winter, and then when you want to use it again in the spring, you just need to make sure that the battery is recharged entirely with the charger before using it in the car.
          Austen Knight
          Social Media Coordinator - Antigravity Batteries
          email: [email protected]
          www.antigravitybatteries.com
          Find us on Instagram! - @antigravitybatteries












          Like Austen stated, Charge it up fully and disconnect from the car or unit until needed in Spring.


          Thank You,

          Bart Hockerman
          Sales Coordinator
          IG @antigravitybatteries
          Direct: (310) 245-1770
          Phone: (310) 527-2330
          Fax: (310) 957-2412
          www.antigravitybatteries.com




          ​

          The replies I received.​
          Last edited by 9kracing; 12-22-2025, 04:00 PM.
          2004 Dinan S3-R M3
          2023 X3M Competition
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            #35
            Any recommendations on a outdoor environment battery tender? Unfortunately I don't have a garage and was interested in a purchasing a tender that can withstand the elements. Maybe small enough that I can run a power source and small enough to fit inside the engine bay.

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              #36
              Originally posted by CarbonBlkM3 View Post
              Any recommendations on a outdoor environment battery tender? Unfortunately I don't have a garage and was interested in a purchasing a tender that can withstand the elements. Maybe small enough that I can run a power source and small enough to fit inside the engine bay.
              just run an extension cord and leave the tender in the trunk
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                #37
                I NOCO Genius2 for the last 6 years with no issues on the Optima Redtop.

                NOCO GENIUS2D 12V 2A Smart Onboard Battery Charger For Cars, Trucks, SUVs, RVs & Lawn Mowers – Automatic Charger, Maintainer, Trickle Charger
                https://no.co/genius2d
                The NOCO GENIUS2D is a direct-mount 12V 2A onboard battery charger, maintainer, trickle charger, and desulfator for lead-acid batteries, including automotive, marine, and deep-cycle types such as flooded, gel, AGM, SLA, VRLA, and maintenance-free. Designed for under-the-hood use and compatible with a wide range of vehicles—including cars, trucks, SUVs, RVs, campers, trailers, pickups, lawn mowers, ATVs, UTVs, tractors, boats, classic cars, and more—it’s a versatile solution for long-term battery maintenance. This fully automatic smart charger is safe for 24/7 use with zero risk of overcharging, using an advanced monitoring system to maintain optimal charge levels. It can charge batteries from as low as 1V and includes Force Mode to manually charge completely dead batteries down to 0V. Precision pulse charging actively combats battery sulfation and acid stratification, helping to restore battery health, extend lifespan, and deliver reliable performance year-round. The GENIUS2D includes a rugged snap-fit mounting bracket and truss-head self-tapping screws for secure, hassle-free installation on most surfaces.

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