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BN-VG121 JVC GZ-HD620 Replacement Battery 3.7V 2700mAh

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From $40.99 USD $50.99
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Fits JVC GZ-HD620, GZ-HM330, GZ-MS210 camcorders; replaces OEM BN-VG121, BN-VG121SU, BN-VG121US battery packs.
3.7V, 2700mAh lithium-ion cell delivers full capacity for extended recording without mid-shoot battery swaps on compact HD cameras.
Connector slides straight into the GZ-HD620 battery slot with the locking tab oriented toward the camera body grip.
We bench-tested this pack on a GZ-HD620 body; the BMS accepted the cell on first insertion and held voltage steady through discharge.
On first use, perform one full charge cycle inside the camera body before extended video recording — JVC bodies need an internal charge cycle to map battery percentage display correctly to this cell.
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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

2700mAh

JVC GZ-HD620 / GZ-HM330 Series — 3.7V Li-ion Replacement Battery (BN-VG121)

This is a 3.7V, 2700mAh Li-ion replacement battery for the JVC BN-VG121 cell. It fits the GZ-HD620, GZ-HD620BAH, GZ-HM330, GZ-MS210, and over 170 additional JVC camcorder models that share the same BN-VG121 battery platform. Voltage and capacity match the original specification exactly.

  • GZ-HD620 and BN-VG121 platform compatibility: JVC built the GZ-HD620, GZ-HM330, and GZ-MS210 lines around the same 3.7V battery rail and connector housing. All models in this group use the same BMS handshake protocol, so one cell fits the full range without adapter or modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a GZ-HD620 body. The BMS accepted the cell on first insert, reported charge state correctly through the camera's indicator, and held voltage within the expected discharge curve under continuous HD recording load.
  • First-use charge cycle on the GZ-HD620: Insert the battery and run one full charge cycle inside the camera body or OEM charger before your first shoot. The GZ-HD620's BMS maps the discharge curve during this cycle — skipping it can cause the battery-remaining indicator to display inaccurate percentages throughout the cell's life.

Why the GZ-HD620 battery percentage display reads inaccurately after fitting a new cell

The GZ-HD620 uses a voltage-threshold system to estimate remaining charge rather than a coulomb counter. When a new cell is installed, the camera has no reference for that cell's discharge curve, so it maps voltage readings against a stored table built from the original cell's age profile. A fresh cell holds a flatter discharge curve than a degraded original, which causes the percentage to jump or drop suddenly at thresholds that no longer align. Running one complete charge-discharge cycle inside the camera body lets the BMS re-calibrate against the new cell's actual voltage behaviour.

GZ-HD620 showing "no battery" or refusing to power on with a new replacement installed

This happens when the BMS detects a cell voltage outside its initialisation window — typically when the replacement cell arrives partially discharged below 3.0V. The camera body interprets a low resting voltage as a fault condition rather than a depleted cell and refuses to boot. Place the battery in the OEM charger first and allow it to reach at least 3.6V before inserting it into the camera body. Once the charger has brought the cell up to that threshold, the camera's BMS will accept it normally on the next power-on.

Compatible Models

GZ-HD620 GZ-HD620BAH GZ-HM330 GZ-MS210 GZ-MG680 GZ-HD500 GZ-HM335 GZ-HM550 GZ-MG750 GZ-MS215 GZ-MS250 GZ-MS230 GZ-MS110 GZ-HM300BUS GZ-HM300U GZ-HM320 GZ-HM320BUS GZ-HM320U GZ-HM550BUS GZ-HM550U GZ-HD500BUS GZ-HD500U GZ-HD620BUS GZ-HD620U GZ-MS110BUC GZ-MS110BUS GZ-MS110U GZ-MS210BUC GZ-MS210U GZ-MS230AUC GZ-MS230AUS GZ-MS230BUC GZ-MS230BUS GZ-MS230RUC GZ-MS230RUS GZ-MS230U GZ-MS250BUC GZ-MS250BUS GZ-MS250U GZ-MG750AUC GZ-MG750BUC GZ-MG750BUS GZ-MG750RUC GZ-MG750U GZ-MG760 GZ-E10 GZ-E100 GZ-E200 GZ-E205 GZ-E220 GZ-E300 GZ-E306 GZ-E505 GZ-EX210 GZ-EX215 GZ-EX250 GZ-EX250BUS GZ-EX310 GZ-EX355 GZ-EX515 GZ-EX555 GZ-GX1 GZ-HD510 GZ-HD520 GZHD520 GZ-HD550 GZ-HD750 GZ-HD760 GZ-HM30 GZ-HM30U GZ-HM35 GZ-HM35U GZ-HM300 GZ-HM310 GZ-HM334 GZ-HM340 GZ-HM350 GZ-HM40 GZ-HM430 GZ-HM435 GZ-HM440 GZ-HM445 GZ-HM446 GZ-HM450 GZ-HM50 GZ-HM50U GZ-HM570 GZ-HM65 GZ-HM650 GZ-HM655 GZ-HM690 GZ-HM860 GZ-HM870 GZ-HM880 GZ-HM890 GZ-HM960 GZ-HM980 GZ-HM990 GZ-MS118 GZ-MS150 GZ-MS216 GZ-MS240 GZ-EX265 GZ-EX275 GZ-EX575 GZ-G3 GZ-GX8 GZ-E245 GZ-E565 GZ-HM970 GZ-HM855 GZ-HM670 GZ-HM845 GZ-HM334BEU GZ-HM335BEU GZ-MS240AUS GZ-HD500BU GZ-HD500SEK GZ-HD500SEU GZ-HD620-B GZ-HD620BEU GZ-HD620BU GZ-HD620-R GZ-HD620-S GZ-HM300BU GZ-HM300SEK GZ-HM300SEU GZ-HM330BEK GZ-HM330BEU GZ-HM330SEU GZ-HM550BEK GZ-HM550BEU GZ-HM550BU GZ-MG750AU GZ-MG750BEK GZ-MG750BEU GZ-MG750BU GZ-MG750RU GZ-MG980 GZ-MG980-A GZ-MG980-R GZ-MG980-S GZ-MS110BEK GZ-MS110BEU GZ-MS110BU GZ-MS210AEK GZ-MS210AEU GZ-MS210BEU GZ-MS210SEK GZ-MS210SEU GZ-MS215BEU GZ-MS215PEU GZ-MS215SEU GZ-MS216AEU GZ-MS216BEU GZ-MS216REU GZ-MS216SEU GZ-MS230AU GZ-MS230BEU GZ-MS230BU GZ-MS230RU GZ-MS250BEK GZ-MS250BEU GZ-MS250BU GZ-E300AU GZ-E300BU GZ-E300WU GZ-E505BU GZ-EX310AU GZ-EX310BU GZ-EX310WU GZ-EX555BU GZ-GX1BU GZ-EX210BU GZ-E200AU GZ-E200BU GZ-E200RU GZ-HM650BU

Replaces Part Numbers

BN-VG121 BN-VG121SU BN-VG121US

Technical Specifications

Voltage3.7V
Amp Hours2700mAh
Capacity2700mAh
Rate9.99Wh
Net Weight64g /2.26 oz
Gross Weight134g /4.73 oz
Approximate Weight134g /4.73 oz
Dimension 42.55 x 30.95 x 34.33mm

Product Highlights

  • Brand: JVC
  • 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 GZ-HD620 shows a full charge immediately after inserting the new battery, then drops to empty within a few minutes of recording — what's happening?

The camera's voltage-threshold indicator is misreading the new cell's discharge curve because it hasn't completed a calibration cycle yet. The GZ-HD620 BMS builds its percentage map during the first full charge-discharge cycle on any new cell. Run the battery completely down from a full charge inside the camera, then charge it fully again — after that single cycle, the indicator tracks correctly against the actual remaining capacity.

The battery percentage on my GZ-HM330 jumps from 60% straight to 10% with no warning — is the replacement cell faulty?

It isn't faulty. This is a voltage-sag artefact specific to how the GZ-HM330 maps its discharge thresholds. At around 3.5V, the cell's voltage drops more steeply than the camera's stored threshold table expects, causing the display to skip past several percentage points at once. The jump narrows after two or three full charge cycles as the BMS accumulates discharge data from the new cell. If the jump persists past three cycles, check that the battery contacts inside the grip are clean and making full contact.

My JVC camcorder body feels noticeably warm during extended HD recording sessions — is that draw too high for this battery?

Heat during sustained HD recording is normal for this platform. The GZ-HD620 and related models draw simultaneously from the sensor, image processor, and optical image stabilisation system, which together pull more current than the spec sheet's single-task figures suggest. The BN-VG121 cell is rated for this combined draw. If the body becomes hot enough to trigger automatic shutdown, check that the ventilation slots on the grip aren't blocked and that ambient temperature is below 40°C — the thermal cutoff activates at that point regardless of remaining battery charge.

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