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Philips SD80 Replacement Battery 14.4V 6800mAh Li-ion

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From $75.99 USD $93.99
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Fits Philips SD80, SD80 Outdoor, SD80/93, and SD80/93 Outdoor speakers; replaces OEM part INR18650-4S2P.
14.4V nominal with 6800mAh capacity delivers 97.92Wh total energy to power extended wireless playback on the SD80 platform.
Four-cell series, two-cell parallel configuration uses dual 18650 form factor in a fixed plastic carrier with spring contact terminals — slides into the battery compartment with alignment pins.
Bench test shows the BMS accepts charge at 2A input with balanced cell voltages across the 4S pack; no pre-charge delay observed on first insertion.
Once monthly, discharge the speaker below 20% before recharging to prevent fuel gauge drift — constant top-off charging without full discharge accelerates capacity fade on this Li-ion cell.
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

6800mAh

Philips SD80 Outdoor Speaker — 14.4V Li-ion Replacement Battery (INR18650-4S2P)

This 14.4V, 6800mAh lithium-ion battery replaces the original pack in the Philips SD80 and SD80/93 Outdoor Speaker series. The 4S2P cell configuration matches the voltage rail and capacity the speaker's amplifier and Bluetooth radio expect. Swap it in when the original cell no longer holds a charge or the speaker shuts down unexpectedly mid-session.

  • SD80 and SD80/93 compatibility: Both the standard SD80 and the SD80/93 Outdoor variant draw from the same 14.4V bus and use the same connector pinout, so one battery fits across the range without modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the SD80 platform and confirmed the BMS handshake triggers correctly — the charge indicator steps through all stages without fault flags.
  • Monthly discharge cycle for the SD80: The SD80 is frequently used as a desk or patio speaker kept on charge between sessions. Letting the pack drop below 20% at least once a month before recharging prevents fuel gauge drift that causes the battery indicator to misread remaining capacity.

Why the SD80 shuts down or clips audio before the battery indicator reaches empty

At high volume, the SD80's Class D amplifier pulls current in sharp spikes. When cell capacity has degraded, internal resistance rises and the pack can't deliver those peaks without voltage sagging below the amplifier's minimum rail. The BMS reads this sag as a low-cell condition and either cuts output or throttles power before the fuel gauge has caught up. A fresh 6800mAh pack at full 14.4V handles those current spikes without the sag that triggers premature cutoff.

SD80 not waking from USB charge after sitting unused for weeks

Li-ion cells left in storage self-discharge slowly. If the SD80 sits long enough, the pack can drop below the minimum acceptance voltage that the USB-C PD circuit requires to start a charge session — the speaker appears completely dead and won't respond to the charge cable. Connect the speaker to a 5V USB source for at least 15 minutes to allow the BMS to trickle-charge the cells back above the PD threshold, then switch to the main charger. If the pack refuses to accept any charge after 30 minutes on trickle, the original cell has likely reached end-of-life and replacement is the correct next step.

Compatible Models

SD80 SD80 Outdoor speaker SD80/93 SD80/93 Outdoor speaker

Replaces Part Numbers

INR18650-4S2P

Technical Specifications

Voltage14.4V
Amp Hours6800mAh
Capacity6800mAh
Rate97.92Wh
Net Weight410g /14.46 oz
Gross Weight480g /16.93 oz
Approximate Weight480g /16.93 oz
Dimension 78.30 x 73.10 x 44.00mm

Product Highlights

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

Frequently Asked Questions

My SD80 Bluetooth drops out whenever I push the volume past two-thirds — is this a battery problem?

Yes, this is a known symptom on the SD80 when the battery pack has degraded. At high volume, the amplifier and Bluetooth radio draw current simultaneously, and a weakened pack can't sustain the combined load without voltage sagging. That sag causes the radio module to briefly lose power, which the speaker registers as a Bluetooth dropout rather than a battery fault. A replacement pack rated at the full 14.4V and 6800mAh eliminates the sag that triggers it.

The SD80 shows a full charge after only 20 minutes on the charger — but then dies much faster than it used to. What's happening?

The fuel gauge has drifted. This happens when the speaker is consistently topped off before the battery drops below 50%, which is common on a desk or patio unit kept plugged in between short sessions. The BMS loses accurate track of true capacity and starts reporting full when the cells are only partially charged. Run the battery down below 20% on the next session, then charge it fully in one uninterrupted cycle — this recalibrates the gauge and brings the reported level back in line with actual cell state.

The SD80 speaker gets noticeably warm on the bottom during long outdoor sessions — is that normal or a battery issue?

Some warmth is expected — the SD80's amplifier generates heat during sustained playback and the battery discharges heat alongside it, with both sources trapped in the fabric housing. However, if the pack is hot to the touch rather than just warm, or if the speaker throttles volume on its own, the cells are running under higher-than-normal internal resistance, which is a sign of a degraded pack. A new pack at full capacity runs at lower internal resistance and generates less heat under the same load. If the housing stays only moderately warm after the swap, the original battery was the source.

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