Batteries & Power

High-output audio systems demand more from a motorcycle's electrical system than the factory setup was designed to supply. A standard lead-acid battery can struggle to maintain voltage under sustained high-current draw from a powerful amplifier — particularly at idle or low RPM. Voltage sag causes the amplifier to compress output, reduces fidelity, and over time stresses the charging system. A lithium upgrade solves this at lower weight.

Lithium motorcycle batteries hold voltage more consistently under load than lead-acid equivalents — delivering more usable current at the voltages amplifiers need to perform correctly. They're also significantly lighter, which matters on a machine where every kilogram is felt. The correct lithium battery for a high-output audio install needs to be rated for the cranking and sustained current demands of your specific bike and amplifier combination.

MAA stocks lithium batteries selected for compatibility with Harley-Davidson Touring models running aftermarket audio. If you're planning a build with 1000+ watts of amplification, upgrading the battery and checking the charging system output is part of the correct build process — not an optional extra. Ships Australia-wide and to New Zealand.
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Lithium batteries suit motorcycle audio builds better than AGM alternatives in most cases — higher energy density means more usable capacity in the same physical size, and lithium holds voltage more consistently under load. For audio builds drawing meaningful current, battery capacity and alternator charge rate both matter.

Running a multi-amplifier audio system draws significantly more current than factory loads. Check total amplifier RMS current draw against the available alternator output and battery reserve capacity for your specific model — undersized power infrastructure is a common cause of voltage sag and audio performance issues on builds that look correct on paper. MAA can advise on battery and power distribution options to suit your build.