NA-20 • compact sodium support
A compact 20Ah sodium-ion option used in applications where space is tight and the charging strategy is appropriate.
VAULT POWER • SODIUM-ION • HARLEY LITHIUM • ELECTRICAL SUPPORT
The battery adds reserve and current capability. The alternator or stator still has to replace the energy the system uses, and the cable, grounds and fuse protection still have to move that current correctly.
We size the battery around the vehicle, charging system, amplifier demand and how the system is actually used.
A compact 20Ah sodium-ion option used in applications where space is tight and the charging strategy is appropriate.
More reserve for larger car-audio electrical systems when the charging system and installation are designed around it.
A 100Ah sodium-ion option for systems that need substantially more reserve and have the space and charging support to use it correctly.
Harley-focused LiFePO4 options where cranking, audio demand, fitment and the bike’s charging system all have to agree.
Sodium-ion, LiFePO4 and AGM batteries do not all share the same charging behavior or voltage limits. We verify the exact battery, allowable voltage range, physical fitment, terminal layout and charging-system compatibility before building around it.
More reserve can keep a system stable longer, but it does not manufacture alternator or stator output.


The previous battery could start the bike but was not keeping up with the audio-system current draw. SMS corrected the battery support with a Vault NA-20.

Three Vault NA-59 batteries were used to support the truck’s bass-system electrical package.
Real SMS footage from a motorcycle electrical-support project.
Send the vehicle or motorcycle, engine, amplifier list, subwoofer plan, current battery setup, alternator or stator information, cable size and how hard/how long the system is normally played.