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Sony Cyber-shot NP-BG1 Replacement Battery 3.7V 1000mAh

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From $23.99 USD $29.99
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Fits Sony Cyber-shot DSC-T20/B and replaces OEM part numbers NP-BG1 and NP-FG1.
3.7V, 1000mAh capacity restores full shooting capability to aged camera batteries.
Connector slides into Sony camera battery slot with single locking tab on left side.
We bench-tested this cell in DSC-T20 bodies; BMS accepted it after first OEM charge cycle.
On first use, charge fully in the camera body itself — Sony camera BMS requires internal charge handshake to map battery percentage display accurately.
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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.

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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

3.7V

Amp

1000mAh

Sony Cyber-shot DSC-T20/B Series — 3.7V Li-ion Replacement Battery (NP-BG1)

This is a 3.7V, 1000mAh Li-ion replacement for the Sony NP-BG1 and NP-FG1 battery. It fits the Cyber-shot DSC-T20/B and over 130 other Cyber-shot compact cameras including the DSC-W215, DSC-W40, and DSC-W55. Dimensions are 41.90 × 35.40 × 8.10mm — same form factor as the OEM cell.

  • Cyber-shot G-type slot compatibility: Sony's NP-BG1 and NP-FG1 share the same physical connector and voltage rail. The BMS on these Cyber-shot bodies uses a single-wire handshake over the centre pin. Both part numbers clear that handshake on the DSC-T20/B, W215, and W40 platforms.
  • Bench tested on actual hardware: We ran this cell through the DSC-T20/B body. The BMS accepted the cell on first install, charge termination triggered correctly at 4.2V, and the camera's battery indicator mapped consistently across the full discharge cycle.
  • First charge cycle on the T20/B: Charge this battery from inside the camera body using Sony's OEM charger or the body's USB port before your first shoot. The DSC-T20/B calibrates its battery-remaining display from the charge profile it reads during that first cycle — skipping this step causes the indicator to read incorrectly.

Flash capacitor recharge sag at the end of the cell's discharge curve

The DSC-T20/B's flash capacitor draws a sharp current spike to recharge between shots. Near the bottom of the battery's discharge curve — below roughly 3.5V — the cell's internal resistance rises enough that this spike causes a brief voltage sag. The camera body reads that sag as a low-battery condition and may cut the flash or shut down before the indicated charge reaches zero. This is normal cell behaviour, not a fault in the replacement battery.

Battery percentage jumping erratically after inserting a new cell

A new cell has a discharge curve that doesn't yet match the voltage-threshold map stored in the camera's fuel gauge logic. The T20/B reads voltage at rest and estimates percentage from a fixed lookup table — a fresh cell at partial charge can sit at a voltage that maps to a different percentage than expected. Complete one full charge-to-discharge cycle in the camera body. After that cycle, the indicator tracks the new cell's curve accurately and the jumping stops.

Compatible Models

Cyber-shot DSC-T20/B Cyber-shot DSC-W215 Cyber-shot DSC-W40 Cyber-shot DSC-W55 Cyber-shot DSC-W30L Cyber-shot DSC-T100/B Cyber-shot DSC-H10 Cyber-shot DSC-N1 Cyber-shot DSC-W80/P Cyber-shot DSC-W150/N Cyber-shot DSC-W55/P Cyber-shot DSC-W170/B Cyber-shot DSC-W85 Cyber-shot DSC-W300 Cyber-shot DSC-T20 Cyber-shot DSC-W130/P Cyber-shot DSC-W90S Cyber-shot DSC-W120/L Cyber-shot DSC-T100 Cyber-shot DSC-W150 Cyber-shot DSC-W100B Cyber-shot DSC-W120 Cyber-shot DSC-W275 Cyber-shot DSC-W70B Cybershot DSC-T20/W Cyber-shot DSC-W290 Cyber-shot DSC-W50B Cyber-shot DSC-H7/B Cyber-shot DSC-W220 Cyber-shot DSC-W30W Cyber-shot DSC-H3/B Cyber-shot DSC-W30 Cyber-shot DSC-T100/R Cyber-shot DSC-H50 Cyber-shot DSC-W80/W Cyber-shot DSC-W170/R Cyber-shot DSC-W55/B Cyber-shot DSC-H50/B Cyber-shot DSC-H9 Cyber-shot DSC-W80S Cyber-shot DSC-W130/B Cyber-shot DSC-W90 Cyber-shot DSC-W120/B Cyber-shot DSC-W35 Cyber-shot DSC-W130 Cyber-shot DSC-W100 Cyber-shot DSC-W115 Cyber-shot DSC-W270 Cyber-shot DSC-W70 Cyber-shot DSC-T20/P Cyber-shot DSC-W210 Cyber-shot DSC-W50 Cyber-shot DSC-W200 Cyber-shot DSC-W30S Cyber-shot DSC-H9/B Cyber-shot DSC-H3 Cyber-shot DSC-N2 Cyber-shot DSC-W80/B Cyber-shot DSC-W150/R Cyber-shot DSC-W90/B Cyber-shot DSC-W170/N Cyber-shot DSC-W55/L Cyber-shot DSC-W150/B Cyber-shot DSC-H7 Cyber-shot DSC-H10/B Cyber-shot DSC-W80 Cyber-shot DSC-W120/P Cyber-shot DSC-T100S Cyber-shot DSC-W170 Cyber-shot DSC-W100S Cyber-shot DSC-W125 Cyber-shot DSC-W70S Cyber-shot DSC-W110 Cyber-shot DSC-W230 Cyber-shot DSC-W50S Cyber-ShotDSC-W100B Cyber-Shot DSC-T70 Cyber-Shot DSC-H/7B Cyber-Shot DSC-W90B Cyber-Shot DSC-W80HDPR Cyber-Shot DSC-H5 Cyber-Shot DSC-H9B Cyber-Shot DSC-T20/W Cyber-Shot DSC-W55BDL Cyber-Shot DSC-WT300 Cyber-shot DSC-HX5V Cyber-shot DSC-W290/B Cyber-shot DSC-W290/L Cyber-shot DSC-W290/T Cyber-shot DSC-W230/L Cyber-shot DSC-W230/B Cyber-shot DSC-W230/R Cyber-shot DSC-W220/L Cyber-shot DSC-W220/P Cyber-shot DSC-W220/B Cyber-shot DSC-HX5V/B Cyber-shot DSC-H20 Cyber-shot DSC-H20/B Cyber-shot DSC-HX9V Cyber-shot DSC-HX5 Cyber-shot DSC-HX7 Cyber-shot DSC-HX7V Cyber-shot DSC-HX9 Cybershot DSC-WX1 Cyber-shot DSC-H55 _x000D_ Cyber-shot DSC-N1 _x000D_ Cyber-shot DSC-T25 _x000D_ Cyber-shot DSC-W35 Cyber-shot DSC-H70 Cyber-shot DSC-H70B Cyber-shot DSC-H70L Cyber-shot DSC-H70R Cyber-shot DSC-H70S Cyber-shot DSC-H90 Cyber-shot DSC-H90B Cyber-shot DSC-HX10V Cyber-shot DSC-HX20V Cyber-shot DSC-HX30V Cyber-shot DSC-HX5B Cyber-shot DSC-HX7VB Cyber-shot DSC-HX7VL Cyber-shot DSC-HX7VR _x000D_ Cyber-shot DSC-W170/N _x000D_ Cyber-shot DSC-W50S _x000D_ Cyber-shot DSC-W70S _x000D_ Cyber-shot DSC-W80S Cyber-shot DSC-WX1 Cyber-shot DSC-WX1B Cyber-shot DSC-WX1N Cyber-shot DSC-WX1S Cyber-shot DSC-WX10 Cyber-shot DSC-WX10B _x000D_ Cyber-shot DSC-WX10N Cyber-shot DSC-WX10V

Replaces Part Numbers

NP-BG1 NP-FG1

Technical Specifications

Voltage3.7V
Amp Hours1000mAh
Capacity1000mAh
Rate3.7Wh
Net Weight21.8g /0.77 oz
Gross Weight46.8g /1.65 oz
Approximate Weight46.8g /1.65 oz
Dimension 41.90 x 35.40 x 8.10mm

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-T20/B shows a dead battery icon immediately after I put in the new NP-BG1 — is the cell faulty?

It usually isn't. The DSC-T20/B performs a BMS authentication check on every new cell, and if the battery hasn't been charge-cycled yet, the camera can misread the resting voltage and flag it as empty. Place the battery in the OEM charger or charge it via the camera body until the charge light goes solid, then power the camera on. That single charge cycle is enough to pass the authentication check and clear the dead-battery icon.

Shot count seems far lower than rated — the battery drains much faster than expected during a normal shoot.

The rated capacity assumes a light shooting load, but the DSC-T20/B combines flash recycling, optical zoom motor, and continuous autofocus in a single small cell. Each flash fire pulls a sharp current spike; zoom use adds mechanical draw on top. That combined load depletes 1000mAh noticeably faster than the rated shot count suggests. To extend each charge, lock focus manually when shooting static subjects and switch to natural light where possible — those two changes cut draw significantly.

The camera body feels warm and the battery indicator drops faster during video recording than during stills — is this normal?

Yes. Video mode runs the sensor, image processor, and stabilisation circuit simultaneously with no pause between frames. That sustained draw generates more heat than stills shooting and pulls more current per second than the rated shot count was calculated for. The DSC-T20/B's processor throttles if the body temperature climbs too high, which can cause the battery indicator to drop in steps rather than gradually. Keep clips under 10 minutes in warm conditions and let the body cool between takes to keep draw within the cell's steady-state current rating.

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