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Philips SD80 Replacement Battery 14.4V 5200mAh Li-ion

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From $68.99 USD $84.99
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Fits Philips SD80, SD80 Outdoor, SD80/93, and SD80/93 Outdoor speakers replacing OEM part INR18650-4S2P.
14.4V 5200mAh delivers 74.88Wh — enough capacity to sustain full-volume wireless playback on this speaker platform.
Connector seats flat into the battery bay with a positive contact tab that locks in a fixed orientation.
We bench-tested the BMS on a Philips charging dock; the cell accepted charge without early cutoff and maintained output under sustained amplifier load.
Discharge the SD80 below 20% once monthly before recharging — constant top-off charging causes fuel gauge drift and accelerates capacity fade on this Li-ion pack.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

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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.

Disclaimer

⚠️ 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

5200mAh

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

This 14.4V 5200mAh Li-ion battery replaces the original pack in the Philips SD80 and SD80/93 Outdoor Speaker. It uses the same INR18650-4S2P cell configuration as the factory battery. When the original pack degrades, the speaker loses portability — this battery restores it.

  • SD80 and SD80/93 compatibility: Both the standard SD80 and the SD80/93 Outdoor variant share the same 14.4V battery bay, connector pinout, and BMS handshake protocol. One battery fits both. No adapter required.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the SD80. The BMS balanced cells correctly across both charge and audio-draw phases, and the protection circuit tripped as expected at low-cell voltage cutoff with no false shutdowns at high amplifier draw.
  • Monthly discharge cycle for the SD80: Let the speaker run down below 20% at least once a month before recharging. The SD80 is commonly left on its dock between uses, which causes shallow-cycle degradation and fuel gauge drift over time — a full discharge resets the gauge and slows capacity fade.

Audio distortion before the battery indicator reaches empty on the SD80

As the cell voltage drops toward the lower end of its discharge curve, the amplifier stage in the SD80 starts clipping before the battery indicator triggers a low-battery warning. The indicator reads off a voltage threshold, but the amplifier reacts to instantaneous current sag under loud audio. A worn or deeply cycled pack has higher internal resistance, which worsens voltage sag under load. Replacing the pack eliminates the resistance gap — the amplifier receives stable voltage through more of the discharge cycle.

SD80 warm to the touch during extended outdoor play

Heat buildup in the SD80 during long sessions comes from two sources running simultaneously: amplifier dissipation and battery discharge heat. In the fabric-wrapped outdoor housing, that heat has limited airflow to escape. A degraded original pack runs at higher internal resistance, generating more heat per discharge cycle. If the housing feels uncomfortably warm, check the battery first — a fresh pack with lower internal resistance reduces one of the two heat sources directly.

Compatible Models

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

Replaces Part Numbers

INR18650-4S2P

Technical Specifications

Voltage14.4V
Amp Hours5200mAh
Capacity5200mAh
Rate74.88Wh
Net Weight394g /13.90 oz
Gross Weight464g /16.37 oz
Approximate Weight464g /16.37 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 Philips SD80 shows a full charge on the indicator but the audio starts cutting out after about an hour of use — what's happening?

This is fuel gauge drift, not a charging fault. Constant top-off charging without a full discharge causes the battery's gauge circuit to lose track of true capacity, so it reports full when the usable charge is significantly lower. Run the speaker down below 20% before recharging for two or three consecutive cycles — this recalibrates the gauge. If the problem persists after recalibration, the original cell pack has degraded past recovery and needs replacing.

Bluetooth keeps dropping on the SD80 when I push the volume above 75% — the battery is new but this still happens with the replacement pack.

At high volume, the amplifier draws a sudden current spike that combines with the radio module's transmit draw. If the pack's internal resistance is even slightly elevated — common in a new battery that hasn't completed its first few conditioning cycles — this combined load causes a brief voltage sag that drops the Bluetooth radio below its operating threshold. Run three full charge-discharge cycles on the new pack to bring internal resistance down to its rated level. After conditioning, the sag at high volume should fall within the radio module's tolerance.

The Philips SD80 won't respond to the USB charging cable after the battery ran completely flat — no LED, no charge indication at all.

A deeply discharged Li-ion pack can fall below the minimum acceptance voltage for the USB-C PD negotiation circuit, so the charger sees no valid handshake and refuses to start charging. Leave the cable connected for 15 to 20 minutes — most BMS circuits include a trickle pre-charge stage that slowly raises the cell voltage to a level where normal charging can begin. If the LED still shows nothing after 30 minutes, measure the pack voltage directly: a reading below 10V on a 14.4V nominal pack means one or more cells have dropped into deep discharge and the pack needs replacing.

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