Tevion SZ7 SZ8 Li-ion Replacement Battery 3.7V 660mAh

Tevion SZ7 / SZ8 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 660mAh Li-ion replacement battery for the Tevion SZ7 and SZ8 compact digital cameras. It slots into the same battery compartment as the original cell and connects via the same contact arrangement. Capacity is 660mAh (2.44Wh), matching the original specification.

• SZ7 and SZ8 compatibility: Both models share the same battery bay dimensions — 40.00 × 31.10 × 5.90mm — and operate on the same 3.7V voltage rail. One cell fits both bodies with no modification.
• Bench tested on actual hardware: We cycled this cell through the camera body's onboard charger and monitored BMS handshake. The camera accepted the cell and battery-remaining display updated correctly after one full charge cycle completed inside the body.
• First charge via camera body: Charge this cell fully inside the camera body before your first shoot. The SZ7 and SZ8 BMS maps the discharge curve during that initial cycle — skipping it can cause the battery indicator to read inaccurately for the first several uses.

Flash not fully recycling between shots on a new cell

The SZ7's capacitor recharge circuit pulls a short burst of high current after each flash fire. A new cell with no charge history may show a slight voltage dip under that load, extending recycle time by a fraction. This typically resolves after two or three full charge-discharge cycles as the cell's internal resistance settles. If recycle lag persists past the third cycle, check that the battery contacts in the body are clean and making firm contact.

Battery percentage jumping erratically on the SZ7 display

This happens when the camera's indicator hasn't mapped the new cell's discharge curve yet. The SZ7 uses voltage thresholds set against the original cell to estimate remaining charge — a fresh replacement discharges along a slightly different curve until the BMS calibrates. Run two full cycles, charging completely inside the camera body each time, and the percentage readout will stabilise. After the second full cycle, the indicator should track smoothly from 100% down to the low-battery cutoff near 3.0V.