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Sony NP-FW50 7.4V Replacement Battery for NEX-5 Mirrorless Camera

Up to 21% off
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From $37.99 USD $46.99
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Fits Sony NEX-5, NEX-5A, NEX-5K, NEX-5D and 90+ mirrorless models; replaces OEM NP-FW50.
7.4V, 1050mAh delivers full power for image capture and video on Sony alpha bodies.
Connector slides into battery compartment with positive terminal forward; locking tab seats flush.
We bench-tested on NEX-5 body charge cycle; BMS accepted cell after one full charge from camera.
On first use, run one complete charge cycle through the camera body before extended shooting — Sony mirrorless systems require an initial charge loop to map the new cell voltage curve to remaining-capacity display.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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

7.4V

Amp

1050mAh

Sony NEX-5 / NEX-5A / NEX-5K / NEX-5D Series — 7.4V Li-ion Replacement Battery (NP-FW50)

This is a 7.4V, 1050mAh Li-ion replacement cell for the Sony NP-FW50 battery pack. It fits the NEX-5, NEX-5A, NEX-5K, and NEX-5D mirrorless camera bodies, along with over 90 additional Sony Alpha and NEX models that share the same NP-FW50 form factor. Voltage and capacity match the OEM spec exactly.

  • NEX-5 series compatibility: The NEX-5, NEX-5A, NEX-5K, and NEX-5D all run on the same 7.4V battery rail and use identical connector orientation and BMS communication protocol — which is why one NP-FW50 cell covers the entire line.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a NEX-5 body. The BMS handshake completed correctly, the camera's battery icon populated without error flags, and the protection circuit triggered at the expected low-voltage cutoff point.
  • First-install charge cycle: Before your first shoot, run one full charge inside the camera body or OEM charger rather than a third-party charger. Sony's BMS maps its battery-remaining display to the cell's discharge curve during that initial cycle — skipping it can cause the percentage indicator to read inaccurately from the start.

Sony BMS rejecting a third-party NP-FW50 cell on first install

Sony camera bodies run an authentication check when a new cell is inserted. If the BMS doesn't receive the expected response during that first handshake, it can flag the battery as unrecognised even when the cell voltage is correct. This most often happens when the cell is inserted into the body cold and without a prior charge. Placing the battery in the OEM charger first — until the charge indicator shows full — then inserting it into the camera body typically clears the rejection flag. If the error persists after one full OEM charge cycle, try a power cycle: remove the battery, wait 10 seconds, and reinsert.

Battery percentage jumping erratically on the NEX-5 display

This happens when the camera's fuel gauge hasn't yet mapped its voltage-threshold table to the new cell's discharge curve. The OEM firmware calibrates the indicator against a reference discharge profile — a new third-party cell with a slightly different internal resistance can cause the percentage to jump or drop suddenly at certain voltage steps. The fix is to run two full charge-to-depletion cycles through the camera body, not a standalone charger, so the BMS can observe the actual discharge curve of this specific cell. After those two cycles, the indicator typically stabilises and tracks accurately down to the 3.0V per-cell cutoff.

Compatible Models

NEX-5 NEX-5A NEX-5K NEX-5D NEX-3 NEX-3C NEX-5C NEX-3A NEX-3D NEX-3DW NEX-3K NEX-3KS NEX-5DB NEX-5H NEX-5HB NEX-5KS Alpha 33 Alpha 55 Alpha 55V Alpha SLT-A35 DLSR A33 DLSR A55 NEX-C3 SLT-A55VB NEX-3DB NEX-3DR NEX-3DS NEX-5N NEX-5NB NEX-5ND NEX-5NDW NEX-5NHB NEX-5NKB NEX-5NKS NEX-5NYB NEX-7 NEX-7B NEX-7K NEX-7KB NEX-C3DB NEX-C3DP NEX-C3DS NEX-C3KB NEX-C3YB SLT-A33B SLT-A33Y NEX-5R NEX-5RB NEX-5RK NEX-5RKB NEX-5RKS NEX-5RKW NEX-6 NEX-6B NEX-6L NEX-6LB NEX-6Y NEX-F3 NEX-F3B NEX-F3D NEX-F3K NEX-F3Y SLT-A37 SLT-A37K SLT-A37M SLT-A37Y Alpha A7 II DLSR A37 Alpha 6 Alpha 7 Alpha 5000 Alpha 5100 NEX3NLB SLT-A35B ILCE-7 ILCE-7/B ILCE-7K/B ILCE-7R/B ILCE-7S ILCE-5000 ILCE-5100 ILCE-6000 NEX-3N NEX-3NL NEX-3NL/W NEX-3NY NEX-5T Alpha A6300 Mirrorless Alpha A3000 Mirrorless Alpha A5000 Mirrorless Alpha A6000 Mirrorless Alpha A3000 Mirrorless Alpha A5000 Mirrorless Alpha A6000

Replaces Part Numbers

NP-FW50

Technical Specifications

Voltage7.4V
Amp Hours1050mAh
Capacity1050mAh
Rate7.77Wh
Net Weight46g /1.62 oz
Gross Weight71g /2.50 oz
Approximate Weight71g /2.50 oz
Dimension 45.30 x 32.10 x 18.50mm

Product Highlights

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

Frequently Asked Questions

My NEX-5 shot count seems lower than expected — is the replacement cell drawing more than it should?

Shot count varies significantly based on how many camera systems are active. On the NEX-5, continuous autofocus, in-body image stabilisation, the EVF, and flash recycling all draw current simultaneously — the rated shot count assumes a standard mix, not continuous use of all four. A session heavy on video or burst shooting will deplete the 1050mAh cell faster than stills-only use. Track your actual draw by checking which camera functions are active rather than comparing raw shot numbers.

The flash on my NEX-5 isn't fully recycling between shots with this new battery — what's causing that?

Flash recycling pulls a short but high-current spike to recharge the capacitor between exposures. If the cell's state of charge is below roughly 50%, internal resistance rises enough that the capacitor recharge current sags, and recycle time extends noticeably. This is normal behaviour tied to cell state, not a fault with the replacement. If you're seeing slow recycle at what appears to be a full charge, run the first-install calibration cycle — charge fully via OEM charger, then discharge fully through the camera body once — to ensure the fuel gauge is reading the actual charge state accurately.

My NEX-5 body gets noticeably warm during extended video recording — is the replacement battery causing this?

The heat during video recording comes primarily from the sensor, image processor, and image stabilisation circuit running simultaneously — not from the battery itself. The NEX-5 body generates more thermal load under sustained video than stills because all three systems draw continuously rather than in short bursts. The battery will also warm slightly under that sustained draw, which is normal for a Li-ion cell operating within its rated current range. If the camera body triggers a temperature warning and shuts down, that's the body's own thermal cutoff protecting the sensor — not a battery fault.

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