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Sony CyberShot NP-BK1 Replacement Battery 3.7V 770mAh

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New arrival
From $23.99 USD $29.99
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Fits Sony CyberShot DSC-S750, DSC-S780, DSC-S950, DSC-S980 and replaces NP-BK1, NP-FK1 battery packs.
3.7V, 770mAh lithium-ion cell delivers the same energy capacity as OEM spec for standard photo and video shooting.
Connector aligns vertically into the battery door slot with a single locking tab — insert until it seats flush.
We bench-tested this cell in a DSC-S950 body; the BMS accepted it without authentication errors after one full charge cycle.
On first install, charge this pack once through the camera body before extended shooting — Sony's firmware needs an internal charge cycle to map the discharge curve correctly to the battery-remaining display.
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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

770mAh

Sony CyberShot DSC-S750 / DSC-S980 Series — 3.7V Li-ion Replacement Battery (NP-BK1)

This is a 3.7V, 770mAh (2.85Wh) Li-ion replacement battery for the Sony CyberShot compact camera range. It fits the DSC-S750, DSC-S780, DSC-S950, DSC-S980, and 38 additional models sharing the NP-BK1 and NP-FK1 specification. The cell matches Sony's original voltage rail and connector pinout for this series.

  • NP-BK1 / NP-FK1 platform compatibility: These models share the same battery bay geometry, 3.7V nominal voltage rail, and BMS communication protocol. A single cell design covers the full S-series compact lineup without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on DSC-S series bodies. The BMS accepted the cell without error flags after one full charge cycle completed inside the camera body.
  • First-use charge cycle: Insert the battery and charge it fully inside the camera body or the OEM Sony charger before shooting. Some S-series bodies need a complete in-body charge cycle to calibrate the battery-remaining indicator against the new cell's discharge curve.

Flash recycling slowing down mid-shoot on the DSC-S750

The DSC-S750's onboard flash capacitor draws a sharp recharge current burst after each shot. As a Li-ion cell ages or sits at a lower state of charge, internal resistance rises and that recharge current sags. The camera body interprets slow capacitor refill as low power and may lock the shutter until recycling completes. If flash lag is increasing, check cell voltage under load — anything below 3.5V at rest indicates the cell needs replacement.

Battery percentage jumping or dropping suddenly on the display

The S-series battery indicator maps voltage thresholds to percentage steps, not a true fuel-gauge IC. A new cell has a slightly different discharge curve than the original Sony cell, so the indicator can skip steps or drop several bars at once. This is a calibration mismatch, not a faulty battery. Run two full charge-to-discharge cycles inside the camera body and the indicator will stabilise against the new cell's actual curve.

Compatible Models

CyberShot DSC-S750 CyberShot DSC-S780 CyberShot DSC-S950 CyberShot DSC-S980 CyberShot DSC-S950/B CyberShot DSC-S950/P CyberShot DSC-S980/B CyberShot DSC-S980/P MHS-PM1 MHS-PM1/D MHS-PM1/V Cyber-shot DSC-W190 Cyber-shot DSC-W190/R Cyber-shot DSC-W190/B Cyber-shot DSC-W180 Cyber-shot DSC-W180/B Cyber-shot DSC-W180/R MHS-PM5 MHS-PM5/K MHS-CM5 Cyber-shot DSC-S950 Cyber-shot DSC-S950B _x000D_ Cyber-shot DSC-S950P _x000D_ Cyber-shot DSC-S950S _x000D_ Cyber-shot DSC-S980 Cyber-shot DSC-S980S _x000D_Cyber-shot DSC-W180/S Cyber-shot DSC-W180B _x000D_ Cyber-shot DSC-W180R _x000D_ Cyber-shot DSC-W180S _x000D_Cyber-shot DSC-W190 _x000D_Cyber-shot DSC-W190/R _x000D_ Cyber-shot DSC-W190B _x000D_ Cyber-shot DSC-W190R Cyber-shot DSC-W190S Cyber-shot DSC-W370 _x000D_ Cyber-shot DSC-W370B _x000D_ Cyber-shot DSC-W370G _x000D_Cyber-shot DSC-W370S _x000D_ MHS-PM5KP _x000D_ Webbie HD _x000D_Webbie MHS-PM1

Replaces Part Numbers

NP-BK1 NP-FK1

Technical Specifications

Voltage3.7V
Amp Hours770mAh
Capacity770mAh
Rate2.85Wh
Net Weight18g /0.63 oz
Gross Weight43g /1.52 oz
Approximate Weight43g /1.52 oz
Dimension 40.10 x 34.10 x 6.80mm

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 DSC-S750 shows a dead battery icon immediately after inserting a fully charged replacement — what's wrong?

The S-series BMS runs an authentication handshake on first install. If the cell hasn't completed a full charge cycle inside the camera body or OEM charger, the body may read it as flat or incompatible. Insert the battery, connect the camera to charge via USB or the Sony charger, and let it run to 100% without interruption. After that first complete cycle, the body will recognise the cell correctly.

The battery percentage on my DSC-S780 drops from 50% to empty in a few frames — is the cell faulty?

Not necessarily. The S-series indicator uses fixed voltage thresholds rather than a fuel gauge. A new Li-ion cell's discharge curve doesn't match the thresholds mapped to the original Sony cell, so the display can skip bars or collapse suddenly. Run the cell through two full charge and discharge cycles inside the camera body. The threshold mapping will align and the readout will track more accurately.

Why does my DSC-S950 get noticeably warm during extended video recording even with a new battery?

During continuous video, the DSC-S950 draws current simultaneously from the image sensor, processor, and display — all from a 770mAh cell. That sustained combined draw raises both the cell temperature and the body temperature faster than still shooting does. It's normal up to a point, but if the body shuts down mid-clip, the thermal protection circuit has tripped. Break recordings into shorter clips and allow 60–90 seconds between takes to let the cell voltage recover above 3.6V before the next clip starts.

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