Can 12 Volt Accessory Circuit of Truck Charge Trailer's Lithium Battery
Updated 03/05/2026 | Published 03/03/2026
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Question:
I have a 2025 Ford F150, I recently installed a 320ah lithium battery in my fifth wheel camper. I am wondering if it would be safe to tow as is without a dc-dc charger or if I can use the battery disconnect on my rv to isolate the lithium from the lead-acid in my vehicle. I tend to leave home with a fully charged RV battery, I plan to do some dry camping however would have limited travel time where charging from the vehicle would be unnecessary, or not helpful. My RV is not equipped with solar. I would have to charge the battery via generator power in a dry camping scenario once I arrived. I just want to protect my vehicles charging system without having to spend $1000 on unnecessary parts.
asked by: Brett D
Expert Reply:
Hey Brett, this is a really great question. Basically if you don't use a DC to DC charger like the part # 331-BCDC1225D that you referenced the battery would only ever get to a charge of around 80 percent since Lithium batteries need a much higher voltage to charge. If you wanted to save some money on a charger we have the part # RED36TR as well which is a 12 amp charger instead. The one you referenced is a 25 amp charger.
Product Page this Question was Asked From
Redarc In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 25 Amp
- Battery Charger
- Battery Charger
- RV/Camper
- Trailer
- 12V
- Charges and Maintains
- AGM
- Calcium
- Gel
- Lead Acid
- Lithium
- Solar Panels to Auxiliary Battery
- Vehicle Battery to Auxiliary Battery
- Smart Charge
- Trickle Charge
- Redarc
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Brett D.
3/5/2026
I’d be interested in something to install on the RV side if possible.