How do I hook up my batteries?

Start by confirming what you’re trying to power and what voltage it needs. Then build the battery setup to match that voltage, use the right cable and fuse, and tighten every connection. Most problems come from the wrong wiring method, mismatched batteries, or loose terminals.

Step 1: Identify your system voltage

• 12V system: most small boats, accessories, fish finders, lights, small inverters

• 24V system: many trolling motors

• 36V system: many higher-thrust trolling motors

• 48V system: golf carts, electric outboards, some large off-grid systems

Match the battery bank voltage to the device voltage. Don’t guess.

Step 2: Choose the right hookup method

Option A: Single battery (most common)

• Use one battery that matches your system voltage (example: one 12V battery for a 12V system).

• Connect battery positive (+) to your positive lead (through a fuse).

• Connect battery negative (-) to your negative lead.

Option B: Series wiring (to increase voltage)

Use series when you need higher voltage (24V, 36V, 48V).

• Connect positive to negative between batteries.

• Use the first battery’s positive and the last battery’s negative as your main outputs.

• Example: two 12V batteries in series = 24V.

Option C: Parallel wiring (to increase runtime)

Use parallel when you want more capacity but the same voltage.

• Connect positive to positive and negative to negative.

• Voltage stays the same, Ah adds up.

Step 3: Use the right cables and fuse

• Use cable sized for your max amps and cable length.

• Put a fuse on the positive lead, close to the battery (typically within 6–12 inches).

• For parallel banks, best practice is fusing each battery’s positive lead.

Step 4: Tighten connections and verify voltage

• Tight, clean terminals matter. Loose lugs cause heat and voltage drop.

• Use a multimeter to confirm the voltage at the main outputs:

  • 12V bank: roughly 13V+ when charged

  • 24V bank: roughly 26V+ when charged

  • 36V bank: roughly 39V+ when charged

  • 48V bank: roughly 52V+ when charged

Step 5: Charge correctly

• Use a charger that matches the bank voltage and supports LiFePO4.

• Don’t charge below 32°F (0°C) unless your battery has internal heating.

Common mistakes to avoid

• Mixing different battery models, capacities, or ages in the same bank

• Wiring series when you meant parallel (or vice versa)

• Using undersized wire that causes voltage drop

• Skipping a fuse or placing it too far from the battery

• Charging a series bank with the wrong voltage charger

If you tell us what you’re powering (trolling motor brand/thrust, inverter watts, golf cart, etc.), your target voltage (12/24/36/48V), and how far the battery is from the device, we can tell you the cleanest way to hook it up.

If you would like additional support directly from a customer support technician, please open a ticket at the link below:
https://dakotalithium.com/sales-technical-support/how-to-contact/