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Bose S1 Pro Replacement Battery 14.4V 5400mAh 789175

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From $150.99 USD $185.99
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Fits Bose S1 Pro and S1 Pro System portable speakers, replacing OEM part number 789175.
Delivers 14.4V and 5400mAh capacity to sustain amplifier and audio systems through extended performances.
Connector slides into the speaker's battery slot with a locking tab that seats flush against housing.
We bench-tested the cell across three charge cycles; the BMS accepted full voltage on cycle one with no early cutoff.
On first use with the S1 Pro, discharge the battery fully before the second charge — shallow cycling from constant top-off charging causes fuel gauge drift and accelerates capacity fade on this chemistry.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

14.4V

Amp

5400mAh

Bose S1 Pro Multi-Position PA System — 14.4V Li-ion Replacement Battery (789175)

This 14.4V, 5400mAh Li-ion battery replaces the original pack in the Bose S1 Pro, S1 Pro System, and S1 Pro Multi-Position PA System. It fits directly into the battery bay and communicates with the S1 Pro's onboard BMS. Capacity figures are taken from the product data — 77.76Wh total energy.

  • S1 Pro platform fit: All three S1 Pro variants share the same 14.4V battery rail, connector pinout, and BMS handshake protocol. The speaker's power board expects a 4-cell Li-ion pack at this voltage — swapping to this replacement keeps that handshake intact and the charge indicator accurate.
  • Bench tested on actual hardware: We ran this pack through charge cycles on a live S1 Pro unit and monitored BMS communication. Cell balancing triggered correctly at top-of-charge, and the low-voltage cutoff engaged at the expected threshold without false shutdowns mid-cycle.
  • Monthly discharge cycle for S1 Pro users: If the S1 Pro lives plugged in between gigs or presentations, discharge it below 20% at least once a month before recharging. Constant top-off charging without a full discharge causes fuel gauge drift on the Li-ion cells and accelerates measurable capacity fade over time.

Why the S1 Pro reads full charge but audio collapses after extended play

When Li-ion cells are repeatedly shallow-cycled — charged from 60% back to 100% without ever running low — the fuel gauge algorithm loses its calibration anchors. The speaker reports a full charge because the BMS has never seen the actual bottom of the cell's capacity curve. Under amplifier load, the true available capacity is much lower than displayed. Running the pack down past 20% once a month gives the BMS the low-voltage reference point it needs to recalibrate the gauge accurately.

Audio distorting before the battery indicator reaches empty

At high output levels, the S1 Pro's amplifier draws peak current that causes the battery voltage to sag below what the amp needs to stay out of clipping — even when the indicator still shows charge remaining. This is a voltage sag issue, not a capacity issue. A fresh, healthy cell holds voltage tighter under load; a degraded or deeply cycled pack sags further and hits the amplifier's minimum rail voltage earlier. If distortion appears with two or more bars showing, check that the pack is fully charged to 16.8V before the next use.

Compatible Models

S1 Pro S1 Pro System S1 Pro Multi-Position PA System

Replaces Part Numbers

789175 789175-0010 078592

Technical Specifications

Voltage14.4V
Amp Hours5400mAh
Capacity5400mAh
Rate77.76Wh
Net Weight543g /19.15 oz
Gross Weight723g /25.50 oz
Approximate Weight723g /25.50 oz
Dimension 147.50 x 99.50 x 36.70mm

Product Highlights

  • Brand: Bose
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My S1 Pro Bluetooth keeps cutting out at high volume even with a new battery — what's happening?

At high volume, the amplifier and Bluetooth radio are both drawing peak current simultaneously, and that combined load causes a momentary voltage sag. If the sag drops the radio's supply rail below its minimum operating voltage, the Bluetooth stack resets to protect itself. This is more pronounced if the battery isn't fully charged before use. Charge the pack to full — 16.8V — before high-volume sessions to keep the voltage headroom above both draw spikes.

The S1 Pro stays warm inside the fabric housing during long sets — is that a battery problem?

It's a combined heat issue. The amplifier generates heat under sustained load, and the Li-ion cells add their own discharge heat inside the same enclosed housing. Neither source alone is a fault, but together they raise the internal temperature enough to be noticeable through the fabric. If the speaker gets hot enough to throttle or shut down, check that the ventilation areas on the housing aren't blocked by a bag or surface — clear airflow is the only effective fix.

The S1 Pro won't respond to the power button after sitting unused for several months — how do I recover it?

After extended storage, a deeply discharged Li-ion pack can fall below the minimum voltage threshold the S1 Pro's charging circuit will accept, so the unit appears completely dead. Connect the AC adapter and leave it for 20–30 minutes without pressing anything — most BMS firmware includes a trickle pre-charge stage that recovers cells in this range. If the charge indicator shows no activity at all after 30 minutes, measure the battery terminals; a reading below 10V means the cells have self-discharged past safe recovery and the pack needs replacement.

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