How To Change Acoustic Electric Guitar Battery

To change acoustic electric guitar battery, you first need to identify which of the two main systems your guitar uses: a standard 9V battery in a side preamp or tail block compartment, or a Taylor-specific cartridge system (either the pre-2022 ES-B with CR2032 button cells or the 9V Expression System). Replacing the power source is a five-minute job once you know your type, and doing it correctly prevents damage to the preamp and ensures you’re not caught silent mid-gig. The most common low-battery warning signs are a dimming or dead onboard tuner, weak or distorted amplified output, or a dedicated low-battery indicator light on the preamp face.

Before you change acoustic electric guitar battery: know your system

Acoustic-electric guitars overwhelmingly use one of two battery formats. The first, and by far the most common, is a single 9V battery (also labeled S-006P, 6F22, or 6LR61), which sits in a compartment either on the side of the guitar as part of the preamp unit or at the tail end near the strap pin. The second is the Taylor ES-B system (pre-2022), which uses two 3V CR2032 lithium button cells housed in a small tray that slides out from the front of the preamp. A third, less common variant is the Taylor 9V Expression System (ES2, ES1.2, ES1.3, EST), which uses a dedicated battery cartridge that inserts into a battery box at the tail block. Check the face of your preamp for model markings or look for a visible battery compartment, this tells you which section below applies to you.

How to change a standard 9V acoustic guitar battery

For the majority of acoustic-electric guitars, the battery compartment is either on the side of the guitar (integrated into the preamp housing) or at the tail end of the body. Here’s the step-by-step for this most common case:

1. Turn off your guitar’s preamp or tuner if it has a power switch. If there’s no switch, unplug any cable from the output jack, this also cuts power on most systems.
2. Locate the battery compartment. On side-mounted preamps, it’s usually a small plastic door on the top edge of the preamp. On tail-block systems, it’s a round or rectangular cover near the strap pin at the bottom of the guitar.
3. Open the compartment. Some covers are held by a small Phillips screw; others pop off with a gentle tug. Use a precision screwdriver only if needed, do not pry against the wood.
4. Remove the old 9V battery from its clip or holder, noting the orientation of the positive and negative terminals (usually marked inside the compartment).
5. Clip or slide in a fresh alkaline 9V battery, matching the polarity markings. Good-quality alkaline batteries are generally recommended for 9V systems.
6. Close the compartment door and tighten any screws just until snug, do not overtighten.

How to change a Taylor ES-B battery (CR2032)

If your Taylor has “ES-B” printed on the preamp face (or you know it’s a pre-2022 model), it uses two CR2032 button cells. This system is different from the 9V standard, so follow these specific steps:

1. Locate the two small clips on the front edge of the preamp/tuner unit, one on each side of the display.
2. Pinch the clips inward simultaneously, this releases the battery tray from the preamp housing.
3. Pull the tray straight out. It will slide freely once the clips are disengaged.
4. Remove the two old CR2032 batteries from the tray, noting their flat-side-up orientation (positive facing up).
5. Insert two fresh 3V CR2032 lithium button cells in the same orientation. These are not the same as 9V batteries, do not force them into a 9V compartment.
6. Slide the tray back into the preamp until you feel the clips click into place.

How to change a Taylor 9V Expression System battery

For Taylor guitars with ES2, ES1.2, ES1.3, or EST electronics, the battery is not in the preamp face. Instead, you’ll find a dedicated battery cartridge at the tail block, the narrow end of the guitar where the strap button is. This cartridge holds a standard 9V battery and slides out for replacement:

1. Look at the tail end of the guitar, near the output jack. You’ll see a small plastic cartridge (often black) that sits flush with the body.
2. Grasp the cartridge’s ridged edge and pull it straight out. It may require a firm tug, do not twist or pry.
3. Remove the 9V battery from the cartridge’s clip. Note the polarity: the clip’s red wire connects to the positive terminal, black to negative.
4. Snap a fresh alkaline 9V onto the clip, matching the same orientation. Taylor recommends changing the battery when it reaches 10% capacity to avoid performance risks, though 30% might suffice for a single gig.
5. Slide the cartridge back into the tail block until it seats fully. You should feel a slight click or resistance.

Test your guitar after a battery swap

After any battery replacement, you need to verify the preamp is receiving power and delivering clean sound. This step is non-negotiable, it confirms you didn’t reverse the polarity or leave a compartment door loose.

1. Plug a standard instrument cable into your guitar’s output jack and connect the other end to an amplifier or PA system.
2. Power on the preamp. If your guitar has an onboard tuner, switch it on, this is the fastest way to confirm power.
3. Strum the strings and listen for clear, amplified sound. If the output is weak, distorted, or absent, double-check the battery orientation and the compartment door fit.
4. Use the tuner (if present) to confirm it registers notes accurately. A dim or non-functioning tuner usually means the battery is not making proper contact.
5. Play a few different chords and single notes across the fretboard to ensure the preamp responds consistently. If you have a low-battery indicator light, confirm it’s off, if it stays lit, the battery is still low or the connection is bad.