Line 6 BA12 JTV Variax Replacement Battery 7.4V 2600mAh

Line 6 JTV James Tyler Variax — 7.4V Li-ion Replacement Battery (BA12)

This is a 7.4V, 2600mAh Li-ion replacement for the BA12 battery used in Line 6 Variax modeling guitars. It fits the JTV James Tyler Variax, Variax Standard, Shuriken, and the broader Variax Guitars range. The battery powers all onboard electronics — the analog-to-digital conversion, model processing, and tuning system.

• Variax platform compatibility: These guitars share a common 7.4V Li-ion power architecture across the JTV, Standard, and Shuriken lines. The battery interfaces with the same internal BMS and connector layout, so one cell spec covers the full platform.
• Bench tested on actual hardware: We ran this battery through charge and discharge cycles on Variax hardware. The BMS accepted the cell without fault codes, and voltage held stable through modeling transitions — including switching between guitar models under active DSP load.
• Variax battery contact care: The BA12 slides into the battery compartment via a contact plate. If the guitar intermittently loses power during play, check that the gold contacts on the cell are clean and free of oxidation — a dry cotton swab removes residue without damaging the surface.

Why the Variax drops its model mid-performance

The Variax's DSP draws a short current spike each time it switches guitar models or engages a tuning preset. An aging BA12 with elevated internal resistance can't supply that spike cleanly — voltage dips below the electronics threshold and the guitar resets or mutes. This isn't a firmware issue. The cell is no longer delivering the current the processor needs. A fresh 7.4V cell with low internal resistance eliminates the dropout entirely.

Variax powers on but tuning accuracy drifts after a few minutes

The Variax's pitch modeling relies on a stable voltage reference to maintain accurate intonation across alternate tunings. As a degraded cell sags under sustained load, that reference voltage shifts — and the guitar's tuning output drifts relative to standard pitch. This typically appears as sharp or flat inconsistencies that worsen the longer the guitar stays on. Replace the BA12 and confirm the fresh cell reads at least 7.2V under load before ruling out other causes.