When It's Okay:
The engine is small or moderate in size, not requiring very high Cold Cranking Amps (CCA).
The deep cycle battery has a high enough CCA rating to handle the starter motor’s demand.
You’re using a dual-purpose battery—a battery designed for both starting and deep cycling (common in marine and RV applications).
The battery is a LiFePO₄ deep cycle battery with built-in Battery Management System (BMS) that supports engine cranking.
When It’s Not Ideal:
Large diesel engines or cold climates where high CCA is essential.
Frequent engine starts that put strain on a battery not designed for cranking power.
The battery is pure deep cycle lead-acid, which may not deliver strong bursts of power and could wear out prematurely when used for starting.
Bottom Line:
Can? Yes.
Should? Only if the deep cycle battery meets or exceeds the CCA demands of your engine and is built for occasional cranking.
Post time: May-06-2025
