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Sony VGF-AP1 Replacement Battery 3.7V 2200mAh Li-ion

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From $26.99 USD $33.99
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Fits Sony VGF-AP1 and SAP1 media players, replaces OEM part 2-174-203-02.
3.7V, 2200mAh lithium-ion cell delivers full playback capacity on a single charge cycle.
Connector slides straight into the battery slot; locking tab seats flush with the housing.
We tested this cell on bench power; the BMS accepted input current without fault codes.
After installation, connect the charger and wait thirty minutes before powering on the device.
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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

3.7V

Amp

2200mAh

Sony VGF-AP1 / SAP1 — 3.7V Li-ion Replacement Battery (2-174-203-02)

This is a 3.7V, 2200mAh Li-ion replacement battery for the Sony VGF-AP1 and SAP1 portable media player. It replaces OEM part numbers 2-174-203-02 and 2-349-036-01. Fits the VGF-AP1L variant as well.

  • VGF-AP1, SAP1, and VGF-AP1L compatibility: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one battery fits all three without modification.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on the VGF-AP1 platform. The BMS accepted the cell without fault codes, held the voltage curve through full playback load, and reported state-of-charge correctly to the device firmware.
  • First charge after deep storage: The VGF-AP1 enters deep discharge protection when the cell drops below roughly 2.5V during long storage. If the device won't respond after install, connect the original charger and leave it for at least 30 minutes before attempting to power on — this allows the BMS to trickle-charge the cell out of protection mode before normal charge current resumes.

Battery percentage jumping after a cell swap on the VGF-AP1

The VGF-AP1 stores learned voltage-threshold data from the previous cell. When a new cell goes in, the firmware maps the old discharge curve onto different capacity characteristics, producing erratic percentage readings. This is not a fault with the replacement cell. Run two or three full charge-to-discharge cycles and the indicator recalibrates to the new cell's voltage profile. After that, the percentage display stabilises.

Playback cutting out before the battery indicator shows empty

The audio amplifier in the VGF-AP1 draws a current spike during loud passages that causes voltage sag at the end of a cell's discharge curve. Once cell voltage drops to around 3.2V, the amplifier can no longer sustain output voltage, and the device shuts down even though the indicator still shows a residual charge. This is a voltage-sag cutoff, not a faulty battery. A full recharge resolves it immediately — the device will show the remaining capacity it reported before shutdown.

Compatible Models

VGF-AP1 SAP1 VGF-AP1LPortable Music Player

Replaces Part Numbers

2-174-203-02 2-349-036-01

Technical Specifications

Voltage3.7V
Amp Hours2200mAh
Capacity2200mAh
Rate8.14Wh
Net Weight46g /1.62 oz
Gross Weight116g /4.09 oz
Approximate Weight116g /4.09 oz
Dimension 65.57 x 18.17 x 18.17mm

Product Highlights

  • Brand: Sony
  • 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 VGF-AP1 won't turn on at all after sitting in a drawer for a year — is the battery dead?

Probably not dead — just in deep discharge protection. When the cell voltage drops below around 2.5V during extended storage, the BMS locks the battery out of normal operation to prevent damage. Connect the charger and leave it plugged in for at least 30 minutes without pressing the power button. Once the trickle charge brings the cell above the protection threshold, the device will accept a normal charge and power on.

The battery percentage on my VGF-AP1 keeps jumping around after I fitted the new cell — is it faulty?

The display is not reading the new cell — it's still using the discharge curve it learned from the old one. When the voltage thresholds don't match, the percentage calculation produces erratic jumps. Run the battery through two full charge and discharge cycles without interrupting them. After the second cycle, the firmware recalibrates its thresholds to the new cell and the percentage readout stabilises.

My VGF-AP1 cuts out mid-playback even though the battery shows it still has charge left — what's happening?

The audio amplifier pulls a voltage spike during playback that the cell can't sustain once it's near the bottom of its discharge curve. The device shuts down at around 3.2V cell voltage to protect the circuit, even when the indicator shows remaining charge. This is normal behaviour for a partially discharged cell under audio load — not a faulty battery. Charge the device fully and the playback will resume from the point it stopped.

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