Sharp AD-S30BT Compatible Battery 3.7V 1000mAh Li-ion

Sharp MD-MS301 / MD-MS701 Series — 3.7V Li-ion Replacement Battery (AD-S30BT)

This is a 3.7V, 1000mAh Li-ion cell that replaces the Sharp AD-S30BT and compatible OEM part numbers across the MD-MS301, MD-MS701, MD-MS702, and MD-MS722 models. It slots into the same battery bay and connects to the same BMS contact points as the original. Capacity is 1000mAh (3.7Wh), matching the stock specification.

• MD-MS301 / MD-MS701 series compatibility: These models share a common battery bay geometry, contact layout, and BMS handshake protocol. The AD-S30BT, AD-S31BT, AD-S31BTX, AD-T50BT, and AD-T51BT part numbers all cross to the same cell specification — same voltage rail, same connector pitch, same BMS communication logic.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible Sharp hardware. The BMS accepted the cell without fault codes, current draw during imaging operations stayed within rated range, and protection circuitry triggered correctly at low-voltage cutoff.
• First charge via camera body: On first install, run one complete charge cycle through the camera body rather than a standalone charger. Sharp's BMS maps the battery-remaining indicator to the discharge curve during that first in-body cycle — skipping it can cause the display to read inaccurately from the start.

Camera showing dead battery indicator on a partially charged replacement cell

Sharp's battery indicator maps percentage thresholds to a discharge curve calibrated during the first charge cycle. A new cell that hasn't been through that cycle will report voltage readings the BMS doesn't recognise as a full charge state. The camera may show one bar or a flashing empty icon even when the cell is at 3.9V or above. Run one full in-body charge from flat to complete — the BMS recalibrates its threshold map and the indicator normalises.

Battery percentage jumping erratically on the Sharp MD-MS701 display mid-shoot

This happens when the BMS voltage-threshold mapping doesn't align with the replacement cell's discharge curve. The original OEM cell's curve was used to set the percentage breakpoints, and a new cell with slightly different internal resistance will cause the indicator to step unevenly — jumping from 60% to 20% without warning. It's a display calibration issue, not a cell fault. Perform two full charge-discharge cycles in the camera body and the indicator will track the new cell's curve more accurately.