Yashica 8KX-1 Replacement Battery 6V 2100mAh Ni-MH

Yashica 8KX-1 / K-H150 / KB-S820 — 6V Ni-MH 2100mAh Replacement Battery

This 6V Ni-MH battery delivers 2100mAh (12.6Wh) to power the light meter, autofocus system, and flash on Yashica film cameras including the 8KX-1, K-H150, KB-S820, KD-70E, and 49 additional models. Original cells in these cameras degrade over decades, and OEM replacements are no longer manufactured. This cell matches the original voltage rail and physical dimensions — 88.95 x 47.55 x 20.73mm — to seat correctly in the battery compartment.

• Cross-model fit across the Yashica range: The 8KX-1, K-H150, KB-S820, KD-70E, and related models share the same 6V battery bay and draw profile. All route battery power through the same internal circuit paths to the light meter, autofocus motor, and flash capacitor — so one cell specification covers the full group.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on camera hardware and confirmed stable voltage delivery across light meter polling, autofocus actuation, and flash recharge events. The cell held voltage within the expected window throughout the discharge curve without premature cutoff.
• Flash capacitor preconditioning: On first install, fire the flash at least five times before shooting. The flash capacitor in these Yashica bodies needs to reform after sitting discharged — skipping this step can cause delayed recycling or a weak first pop even on a full cell.

Flash recycling lag on a freshly installed cell

After a long period without power, the electrolytic capacitor in the flash circuit loses some of its charge-holding capacity and needs conditioning under load. A new cell delivers full voltage immediately, but the capacitor will not absorb charge at its rated rate until cycled a few times. Fire the flash repeatedly in manual mode — not during shooting — until recycling speed stabilises. If lag persists beyond ten cycles, the capacitor itself may need replacement, which is separate from the battery condition.

Light meter reading erratically after battery swap

The light meter circuit in these Yashica bodies is sensitive to voltage at the low end of the discharge curve. Ni-MH cells have a flatter discharge profile than the original alkaline or older Ni-Cd cells some users substituted — the meter can interpret mid-discharge voltage as nearly depleted. If the meter reads low or fluctuates shortly after install, confirm the cell is fully charged — a rested, fully charged Ni-MH cell should sit at approximately 1.2V per cell, giving 7.2V open-circuit across a six-cell pack before settling to 6V under load. A full charge cycle resolves most erratic readings on first use.