24V 50AH Sport Series Lithium Bluetooth Battery Group Size 24

Recommended Chargers

The Millertech 24V 50Ah Marine Deep Cycle lithium battery is engineered for a max charge voltage of 29.2V charging profile.

1) 12V 10A Charger (1210C)

What it is: A small 110V AC plug-in lithium charger that outputs 14.6V at 10A (2-stage).  Typical speed (100Ah battery): roughly 10–12 hours from low to full (real-world varies). Why choose it:

• Most Economical option

• Good if you charge overnight or you don’t drain the battery hard each day

• Handy when charging off a solar + inverter type setup (smaller AC charger). 

2) 24V 15A On-Board Lithium Charger (2415M)

What it is: A waterproof on-board lithium charger designed to mount permanently in a boat for charging 24V lithium batteries.

Features and Benefits

• 15A charging output

• IP65 waterproof rating

• Designed for permanent installation

Why choose it

• Faster charging than smaller chargers

• Marine-ready waterproof design

• Ideal for trolling motor battery systems

3) 12V-24V Dark Speed On The Run Dual Marine Charger

The Millertech Dark Speed “On The Run” Dual Marine Charger is a lithium battery charger designed to charge your auxiliary lithium battery bank directly from your boat’s alternator while the motor is running. This allows your batteries to recharge during the day while you are on the water instead of relying only on shore power. 

Features and Benefits

• Dual charging outputs

  • Output 1: 14.5V – 15A (12V battery)

  • Output 2: 28.8V – 15A (24V battery) 

• Alternator-powered charging while running so batteries recharge while you are using the boat. 

• Smart power management prioritizes the starting battery before charging auxiliary lithium batteries. 

• Automatic BMS wake-up function for depleted lithium batteries. 

• Advanced charging algorithms designed to maintain battery health and extend lifespan. 

• Built-in safety protections

  • Low-voltage protection

  • Over-voltage protection

  • Over-temperature protection 

• IP65 waterproof rating for marine environments. 

Specs

• Input Voltage: 90–130V AC

• AC Power Draw: 650W

• Start Transfer Voltage: 14V

• Stop Transfer Voltage: 13.3V

• Dimensions: 10¾″ × 7¾″ × 3½″

• Weight: 13.8 lbs 

4) Millertech 12V, 16V, 24V, 3-Bank Battery Charger (Model#121624-3)

The Millertech 12V, 16V, 24V 3-Bank Battery Charger (Model 121624-3) is an onboard lithium charger designed to charge three separate batteries at the same time from one unit. It’s commonly used in marine setups where a boat has multiple batteries—such as a starting battery and an electronics battery. The charger is part of Millertech’s multi-bank lineup and is typically used when you want to charge multiple batteries overnight with a single plug-in connection.

This charger has three independent charging banks, each delivering about 15 amps, so each battery receives the proper charge without affecting the other. Because the banks are isolated, the charger automatically manages each battery individually to maintain proper charging and battery health.

Permanent Marine Installation. This is an onboard charger, meaning it is mounted permanently in the boat. After a day on the water you simply plug the boat into shore power and it charges everything automatically.

Specs

• Input Voltage: 90–130V AC

• AC Power Draw: 1,110W

• Dimensions: 10.5″ × 9.75″ × 4″

• Weight: 15 lbs

This charger has three independent charging banks, allowing you to charge multiple batteries simultaneously without needing separate chargers. Each bank can be configured for different battery voltages:

• 12V battery bank – commonly used for electronics or starting batteries

• 16V battery bank – often used for high-performance marine electronics systems

• 24V battery bank – commonly used for trolling motor batteries

THE MILLERTECH® SPORT SERIES LITHIUM BATTERY
10 YEAR GUARANTEED WARRANTY IS SIMPLE!

TERMS:

From the date of your battery purchase through year number 10 of ownership, your battery is covered. If it stops working during this time, we will repair or replace it with a battery of equal or greater value for FREE!

SHIPPING:

We cover all shipping costs associated with shuttling your battery back and forth for repair or replacement. It is our warranty; it is our cost; not yours.

EXCLUSIONS:

There are NONE! You trusted Millertech®, and if it’s within the warranty period your Millertech® battery is completely covered for everything!

PROOF OF PURCHASE:

You don’t need one. If it’s Millertech®, it’s covered!

FOR WARRANTY SERVICE CALL: 855-MAX-LITH

EMAIL:  warranty@millertechenergy.com