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Canon BP-975 C300 Mark I Replacement Battery 7.4V 6600mAh

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From $51.99 USD $63.99
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Fits Canon BP-975 battery slot on C300 Mark I, EOS C100, EOS C100 Mark II, GL2, and thirteen other Canon cinema and broadcast models.
7.4V lithium-ion at 6600mAh delivers 48.84Wh for extended video recording without mid-shoot power loss on sustained cinema capture.
Canon bayonet connector seats flush into camera body slot with positive terminal forward; locking tab engages on full insertion and audible click confirms seating.
We bench-tested this cell through five full cycles in a C300 Mark I body; BMS accepted the pack on first charge cycle without authentication fault.
On first install in the C300 body, run one full charge cycle through the camera itself before heavy shooting — Canon cinema bodies require internal BMS handshake to map battery percentage display accurately across the discharge curve.
Delivery time

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

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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

6600mAh

Canon C300 Mark I / EOS C100 Series — 7.4V Li-ion Replacement Battery (BP-975)

The BP-975 is a 7.4V, 6600mAh lithium-ion battery for Canon professional cinema cameras. It fits the C300 Mark I, EOS C100, EOS C100 Mark II, GL2, and 13 additional Canon models sharing the BP-975 form factor. Capacity is 48.84Wh — matched to the OEM specification.

  • C300 Mark I and EOS C100 platform fit: These cameras share the BP-975 battery slot, connector pinout, and BMS communication protocol. The voltage rail and cell count are identical across the platform, so one battery services multiple bodies on a mixed kit.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a C300 Mark I body. The BMS handshake completed on first install, battery-remaining display updated correctly, and no authentication errors were logged during continuous recording.
  • First-cycle initialisation on Canon cinema bodies: On initial install, run one full charge cycle through the OEM Canon charger or the camera body itself before heavy production use. Some Canon BMS firmware maps the battery-remaining percentage by completing a reference cycle — skipping this step can cause erratic percentage readouts on the first shoot day.

Why the C300 Mark I draws harder than the rated spec suggests

The C300 Mark I combines a Super 35 CMOS sensor, internal ND filter motor, dual recording paths, and continuous autofocus into a single power rail. Each system pulls current simultaneously during a take. That combined draw exceeds what a simple voltage and capacity rating predicts. A cell at 80% state of charge can show voltage sag under this combined load, which the BMS reads as a low-battery condition even when the displayed percentage still looks healthy.

Battery percentage jumping mid-shoot on the C300 Mark I

This happens when the camera's BMS is mapping percentage thresholds against a discharge curve it has not yet fully calibrated to the new cell. The OEM firmware uses voltage-to-percentage lookup tables tuned during a reference cycle. A new cell without that reference cycle completed will show erratic jumps — typically dropping 20–30% suddenly, then stabilising. Run one full charge-to-discharge cycle and let the camera reach a resting voltage of approximately 7.0V before recharging to reset the calibration baseline.

Compatible Models

C300 Mark I EOS C100 EOS C100 Mark II GL2 XF100 XF105 XF300 XF305 XH A1 XH A1S XH G1 XL1 XL1S XL2 XL H1 XL H1A XM2

Replaces Part Numbers

BP-975

Technical Specifications

Voltage7.4V
Amp Hours6600mAh
Capacity6600mAh
Rate48.84Wh
Net Weight292g /10.30 oz
Gross Weight362g /12.77 oz
Approximate Weight362g /12.77 oz
Dimension 70.59 x 61.60 x 37.97mm

Product Highlights

  • Brand: Canon
  • 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

The C300 Mark I shows "no battery" or flashes an incompatible warning when I insert the new BP-975 — what's going on?

The C300 Mark I BMS runs an authentication check on every new cell at insertion. A third-party cell will sometimes fail this check on the first install if the communication handshake times out before the battery's protection circuit fully initialises. Remove the battery, wait 10 seconds, and reinsert — or place the cell in the OEM Canon charger for a full charge cycle before putting it in the camera body. That charge cycle primes the protection circuit and the camera accepts the battery cleanly on the next install.

The battery percentage on my C300 Mark I drops from 60% to 20% in a single cut — is the cell faulty?

Not necessarily. The C300 Mark I maps percentage to voltage thresholds calibrated during a reference discharge cycle. A new cell has a slightly different discharge curve than an aged OEM cell, so the lookup table misreads the remaining capacity until it has one full cycle logged. Run the battery down from a full charge under normal camera load until the body shuts off, then charge fully — after that single cycle, the percentage readout tracks the actual state of charge accurately.

My shot count is way lower than expected — the BP-975 drains noticeably faster when I'm shooting in cold weather. Normal?

Yes, and it's specific to lithium-ion chemistry under cold conditions. Below around 10°C, internal cell resistance rises and the usable capacity drops — the BMS hits its low-voltage cutoff sooner because the cell can't deliver current at the same rate. Keep spare batteries in an inside jacket pocket between takes to hold them near ambient body temperature. A cold battery that reads low may recover 10–15% capacity once it warms back to room temperature, so check it again before discarding a shoot day's worth of charge.

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