Kyocera 8KX-1 Replacement Battery 6V 4200mAh Ni-MH

Kyocera 8KX-1 / K-H150 / KB-S820 — 6V Ni-MH Replacement Battery

This Ni-MH battery replaces the original cell in the Kyocera 8KX-1, K-H150, KB-S820, KD-70E, and over 49 compatible Kyocera camera models. It runs at 6V with a 4200mAh (25.2Wh) capacity. Physical dimensions are 88.95 x 47.55 x 36.50mm — confirm against your current cell before ordering.

• Shared platform across Kyocera models: These Kyocera models share a common 6V battery format and connector pinout. The BMS in each body reads voltage and temperature from the same reference points, so one cell works across the whole group without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on camera hardware, monitoring BMS handshake, temperature response, and cutoff behaviour at low state of charge. The cell maintained stable voltage through the discharge curve without triggering early cutoff.
• First-install charge cycle: On first use, run a full charge cycle through the OEM charger or camera body before heavy shooting. Some Kyocera BMS implementations require one complete charge cycle from within the camera to accept the new cell and display battery-remaining accurately.

Battery percentage jumping erratically on the Kyocera display

Kyocera camera bodies map battery percentage to a voltage-threshold table calibrated to the original cell's discharge curve. A fresh Ni-MH replacement discharges along a slightly different slope, so the indicator can jump — showing 80%, then 40%, then 70% within a short session. This is not a fault in the cell. After one or two full charge-discharge cycles, the BMS recalibrates its internal reference and the percentage reading stabilises. If the jumping persists beyond two cycles, charge fully to 6V via the OEM charger and repeat.

Flash not fully recycling between shots on a new cell

Flash recycling depends on capacitor recharge current, which draws hard on the battery in the seconds between shots. If the cell is partially discharged or has not yet completed its first break-in cycle, internal resistance is higher than rated — the capacitor recharge slows and the camera forces a longer wait between flash exposures. Fully charge the cell before a flash-heavy shoot. If recycle lag continues after a full charge, the cell's internal resistance may still be elevated from storage — one full discharge and recharge cycle typically brings it down to operating spec.