About this replacement
JVC GY-HMQ10 / GY-HM600E Series — 7.4V Li-ion Replacement Battery (SSL-JVC75)
This is a 7.4V 7800mAh (57.72Wh) lithium-ion replacement for the JVC SSL-JVC75 battery pack. It fits the GY-HMQ10, GY-HMQ10E, GY-HM600E, GY-HM600EC, and more than a dozen other JVC professional camcorder bodies. Capacity figures come from product data — not estimated from web specs.
- GY-HM600 and GY-HMQ10 platform fit: These models share the same battery bay dimensions, 7.4V supply rail, and InfoLithium-style communication protocol. One cell SKU covers both lines without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a GY-HM600E body. The BMS handshake completed on the first cycle, battery-remaining display tracked correctly, and no authentication rejection was triggered during recording.
- First-cycle acceptance on broadcast bodies: Charge the replacement fully inside the OEM JVC charger or camera body before shooting. JVC's BMS maps its battery-level indicator against a discharge curve baseline it builds on that first full cycle — skipping this step causes erratic percentage readings in the field.
Why the GY-HMQ10 shows a dead battery icon on a new, charged cell
JVC's InfoLithium-style fuel gauge doesn't read raw voltage alone — it references a stored discharge curve from the cell's first calibration cycle. A brand-new replacement hasn't built that curve yet, so the body defaults to displaying empty or unknown. This isn't a compatibility fault. Charge the battery to full in the OEM charger, insert it, and allow the camera to complete one full discharge before trusting the indicator. After that cycle, the percentage display stabilises.
Battery percentage jumping or dropping suddenly during recording
This happens when the camera's fuel gauge is mapping against a curve the new cell hasn't matched yet. The GY-HMQ10 draws variable current — codec processing, viewfinder backlight, and 4K sensor readout all spike demand at different points. Those spikes cause voltage dips that the uncalibrated gauge misreads as a steep state-of-charge drop. Run one full charge-discharge cycle through the camera body. After calibration, the gauge tracks to the cell's actual 7.4V discharge curve and the jumping stops.