Toshiba PDR-BT1 Allegretto M70 Replacement Battery 3.7V 2400mAh

Toshiba Allegretto M70 / PDR-M Series — 3.7V Li-ion Replacement Battery (PDR-BT1)

This is a 3.7V, 2400mAh Li-ion replacement cell for the Toshiba Allegretto M70 and PDR-M4, PDR-M5, and PDR-M70 digital cameras. It replaces OEM part numbers PDR-BT1, PDR-BT2, and PDR-BT2A. Capacity is 8.88Wh — matched to the original spec from product data.

• PDR-M series compatibility: The M4, M5, M70, and Allegretto M70 share the same battery bay dimensions and voltage rail. All four models run the same 3.7V BMS handshake, so one cell fits the full line without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible PDR-M hardware. The BMS accepted the cell without fault codes, held voltage across a full discharge curve, and showed no abnormal cutoff behaviour at either end of the charge range.
• First charge in the camera body: Some Toshiba PDR-series bodies require one complete charge cycle from inside the camera — not just via an external charger — before the battery-remaining indicator reads accurately. Run one full in-body charge cycle before shooting.

Dead battery indicator showing on a new, partially charged cell

The Toshiba PDR-M series maps its battery indicator to a specific voltage-threshold table built around the OEM cell's discharge curve. A new third-party cell delivered partially charged can sit at a voltage the camera reads as critically low, triggering the dead battery icon before any actual depletion. This is a calibration mismatch, not a faulty cell. Charge the battery fully in the camera body first — the BMS recalibrates its threshold mapping once it sees a complete charge-to-discharge cycle from 4.2V down.

Flash recycling slowing down mid-shoot on a new replacement cell

The flash capacitor in the PDR-M series draws a short, high-current spike to recharge between shots. If the replacement cell has a higher internal resistance than the worn OEM cell the camera was tuned around, that spike causes a brief voltage sag, and the camera body throttles recharge current to protect the circuit. The result is longer recycling gaps between flashes — even on a full charge. Check that the cell contacts are clean and seated fully; a partial contact adds resistance on top of the cell's own impedance. If the issue persists across a full charge cycle, confirm cell voltage reads at least 4.1V before shooting.