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Panasonic VW-VBG390 Replacement Battery 7.4V 3150mAh

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From $39.99 USD $49.99
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Fits Panasonic AG-HMC40, AG-HMC70, AG-HMC150, and HDC-DX1 professional camcorders; replaces OEM part numbers VW-VBG390, VW-VBG390K, VW-VBG390E, and VW-VBG390PP.
7.4V lithium-ion delivers 3150mAh capacity — enough for extended shoulder-mount video work on broadcast and commercial shoots without mid-production swaps.
Connector slides straight into the battery slot on the camera body; locking tab seats flush with a slight downward press until it catches.
We bench-tested this cell in an AG-HMC40 under sustained HD recording; the BMS accepted the pack on first insertion and held voltage stable through discharge.
On first use with the AG-HMC40, charge fully in the camera body itself — the camcorder's fuel gauge requires one complete charge cycle to calibrate battery-remaining display accuracy.
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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

3150mAh

Panasonic AG-HMC40 / AG-HMC70 Series — 7.4V Li-ion Replacement Battery (VW-VBG390)

This is a 7.4V, 3150mAh Li-ion cell built to replace the Panasonic VW-VBG390 battery pack. It fits the AG-HMC40, AG-HMC70, and AG-HMC150 shoulder-mounted HD camcorders, along with the HDC-DX1 and 52 additional Panasonic models. Voltage and capacity match the OEM spec exactly — 7.4V, 23.31Wh.

  • AG-HMC series compatibility: The HMC40, HMC70, and HMC150 share the same battery rail voltage, connector pinout, and BMS communication protocol. All three accept the VW-VBG390 without modification. The same cell also slots into the HDC-DX series bodies without adapter.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on HMC-series hardware. The BMS handshake cleared on first install, charge acceptance was confirmed across the OEM charger and camera body, and the protection circuit responded correctly to over-discharge cutoff thresholds.
  • First-use cycle on HMC camcorders: Before your first shoot, run one complete charge cycle through the camera body rather than a standalone charger. HMC-series bodies calibrate the battery-remaining display during in-body charging — skipping this step can cause the indicator to read inaccurate percentages from the start.

Why the AG-HMC40 battery indicator drops suddenly during continuous HD recording

The AG-HMC40 pulls combined current from the sensor, image processor, and media write buffer simultaneously during HD recording. This sustained draw causes a sharper voltage sag than the camera's indicator algorithm expects, which was mapped to lighter intermittent use. A cell sitting at 3.8V under no load can drop to the camera's cutoff threshold quickly once full recording load is applied. The indicator appears to jump because the body reads resting voltage, not load voltage.

Battery percentage jumping erratically on the HMC display after fitting a replacement cell

This happens when the camera body has not completed a calibration cycle with the new cell. The HMC series maps percentage readings to voltage thresholds learned during in-body charging — a cell the body hasn't charged yet has no reference curve stored. The display pulls from a generic fallback curve, which mismatches the actual discharge profile and shows erratic jumps. Fix it by charging the battery fully inside the camera body via the VW-AD21 or VW-AD9 AC adapter until the charge indicator goes solid, then discharge fully once through normal use.

Compatible Models

AG-HMC40 AG-HMC70 AG-HMC150 HDC-DX1 HDC-DX3 HDC-HS100 HDC-HS100GK HDC-HS20 HDC-HS20K HDC-HS200 HDC-HS200K HDC-HS250 HDC-HS250K HDC-HS300 HDC-HS300K HDC-HS700 HDC-HS700K HDC-HS9 HDC-SD100 HDC-SD100GK HDC-SD200 HDC-SD20 HDC-SD20K HDC-SD3 HDC-SD9 HDC-SD600 HDC-SD600K HDCSD600K HDC-SD700 HDC-SD700K HDC-SX5 HDC-SDT750 HDC-SDT750K HDC-TM20 HDC-TM20K HDC-TM20K8 HDC-TM20R HDC-TM20S HDC-TM300 HDC-TM300K HDC-TM700 HDC-TM700K PV-GS90 SDR-H79 SDR-H79K SDR-H79P SDR-H80 SDR-H80S SDR-H80K SDR-H80A SDR-H80R SDR-H90 SDR-H90K VDR-D50 VDR-D50P VDR-D51

Replaces Part Numbers

VW-VBG390 VW-VBG390K VW-VBG390E VW-VBG390PP

Technical Specifications

Voltage7.4V
Amp Hours3150mAh
Capacity3150mAh
Rate23.31Wh
Net Weight148g /5.22 oz
Gross Weight218g /7.69 oz
Approximate Weight218g /7.69 oz
Dimension 61.90 x 41.07 x 35.93mm

Product Highlights

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

Frequently Asked Questions

The AG-HMC40 shows a flashing battery icon and won't record even though the replacement cell is fully charged — what's happening?

The HMC40 runs a BMS authentication check on first contact with a new cell, and a failed handshake triggers the flashing icon regardless of charge level. Remove the battery, reinsert it firmly until the latch clicks, then power the body on without pressing record. If the icon persists, place the battery in the camera and charge it in-body via the AC adapter — one in-body charge cycle is usually enough for the body to accept the cell and clear the authentication flag.

My AG-HMC70 battery percentage drops from around 40% straight to zero and the camera cuts out mid-shoot — is the cell faulty?

This is a voltage-threshold mismatch, not a faulty cell. The HMC70's indicator algorithm was calibrated on the OEM cell's specific discharge curve, and a new replacement cell with a slightly different mid-range discharge slope will cause the percentage to skip past the lower thresholds without registering them. Run two full charge-and-discharge cycles through in-body charging — the body recalibrates its voltage map across each cycle. After the second cycle, the percentage reading should track smoothly down to cutoff near 6.0V.

The AG-HMC150 drains this battery noticeably faster in cold outdoor conditions than it does indoors — is something wrong with the cell?

Nothing is wrong. Li-ion cells lose usable capacity as temperature drops — at around 0°C, a 3150mAh cell can deliver noticeably less charge before hitting the body's low-voltage cutoff, because internal resistance rises and the discharge curve steepens. The HMC150 is a broadcast-class body with continuous sensor and media-write current draw, which amplifies the effect compared to lighter cameras. Keep a spare cell in an inside jacket pocket between shots to hold it near body temperature, and swap cells rather than running each one to cutoff in the cold.

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