(7 Reviews)

12V-36V Dark Speed Dual Charger

DS36

Millertech’s Dark Speed “on-the-run charger” will maximize your trolling motor run time by sending excess energy from your engine’s charging system, to your 36v trolling motor batteries!

Dark Speed “On The Run” vs. traditional lithium battery charging methods

The Dark Speed “On The Run” charger offers a distinct advantage over traditional charging methods by allowing you to recharge your auxiliary lithium battery bank directly from your motors alternator while in motion plus diverting any extra power directly to your 24v or 36v battery.

Here’s a comparison to highlight the differences:

Charging speed and efficiency

  • Dark Speed “On The Run”: Enables fast and continuous charging of your whole lithium battery system while your vehicle is running. This eliminates downtime associated with traditional charging methods and keeps your equipment ready for extended use.
  • Traditional Chargers: Often require longer charging times since no power is being distributed throughout the day.

 Power source and convenience

  • Dark Speed “On The Run”: Utilizes your vehicle’s alternator as the power source, providing convenient and fast charging whenever your on the move. This eliminates the need for daily shore power hookups, generators, or external power sources.
  • Traditional Chargers: Rely on external power sources like shore power, generators, or separate charging units often limiting your day on the water to 10 or less hours. 

 Flexibility and freedom

  • Dark Speed “On The Run”: Offers unparalleled freedom and flexibility, letting you stay out on the water longer without worrying about power depletion. You’re no longer tethered to a fixed power source.
  • Traditional Chargers: Can be restrictive, requiring you to dock at a marina or use a generator for daily recharging limiting your autonomy.

Customer Reviews

Ed
Rating: 5/5
Eddy
Working the best will keep you on the water longer 👍👍
Tue Jul 21 2026 01:07:38 GMT+0000 (Coordinated Universal Time)
Brian
Rating: 5/5
Great charger!
After fighting with my previous charger more times than I could count, I went to the company who's batteries I was already running. The new Dark Speed charger does exactly as advertised, and frankly, exactly what all chargers should do! Charge the batteries! The quickness of charge, and the "charge on the run" are added features that are absolutely great at the pricepoint. With the technology built into today's lithium batteries, having chargers with too many features hurts more than it helps! Let the batteries control the state of charge. .. not the charger. Get the Dark Speed for your on-board and you won't regret it!
Sat Jun 13 2026 00:20:16 GMT+0000 (Coordinated Universal Time)
Rob Ellis
Rating: 5/5
Owner
After a 2 year complete restoration of my 94 Ranger, which I ordered and maintained. Power Pole Trolling, Garmin Units, New Lids on Deck . Complete 3M padding with Carpet. Trailer as well Powder Coated. Nothing I didn't do. Then comes the Heart of the Boat, Power Needs. Dark Speed Charger, 105 36 Trolling,190 Dual Purpose. .Owning an Elec/Lighting Company, I did my homework. Extremely Happy with Visual Quality appearance, Functionality and Usage. Most importantly is Customer Service. Im Extremely particular especially with this Boat and could not be Happier considering all the other options available when searching. Just 1st Class.
Mon Jun 08 2026 10:43:30 GMT+0000 (Coordinated Universal Time)
Walter
Rating: 5/5
On board charger
Was on my 2nd power pole charger last one lasted 4 months talked to a miller tech team member said i needed a charger like power pole and he suggested Miller tech on board charger I. Said I need it in 2 days he said could make it happen I ordered it it was on time it working awesome good. Buy
Wed Apr 08 2026 20:40:42 GMT+0000 (Coordinated Universal Time)
Charles
Rating: 5/5
Charger
High Quality!
Wed Feb 18 2026 01:24:15 GMT+0000 (Coordinated Universal Time)
Rusty Trancygier
Rating: 5/5
Great quality!
12V-36V Dark Speed On The Run Dual Marine Charger
Mon Nov 03 2025 14:55:22 GMT+0000 (Coordinated Universal Time)
John McAllister
Rating: 5/5
12V-36V Dark Speed On The Run Dual Marine Charger
I purchased the 12V-36V Dark Speed On The Run Dual Marine Charger along with two 36v 60 amp batteries and a 12v 190 amp battery. After using the trolling for the majority of the day, the Dark Speed Charger kept the 36v batteries charged at mid-90% charge by transferring charge from the 12v, as required. Having the needed power was not a concern as the Miller Tech app on my phone kept me informed of the battery charge status throughout the day. I have 100% confidence in the Dark Speed Charger and Miller Tech stands firmly behind their products, just read their warranty. Thank you for great products at a reasonable price!
Fri Jan 10 2025 05:00:00 GMT+0000 (Coordinated Universal Time)

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