GE Druck IO620 Replacement Battery 3.7V 4400mAh Li-ion

GE Druck IO620 / DPI 620 Series — 3.7V Li-ion Replacement Battery (191-365)

This 3.7V 4400mAh Li-ion battery fits the GE Druck IO620, IO620IS, DPI 620/G, and DPI 620 Genii handheld pressure calibrators. These instruments are used for pressure measurement, documentation, and calibration in industrial and field environments. Capacity figure is 4400mAh (16.28Wh) as supplied.

• IO620 and DPI 620 series pack compatibility: The IO620, IO620IS, DPI 620/G, and DPI 620 Genii all share the same battery bay geometry, connector pinout, and BMS handshake protocol — one pack covers the full platform without modification.
• Bench tested on actual hardware: We cycled this pack through the IO620 charge and discharge sequence and monitored the BMS communication with the instrument. The protection circuit responded correctly to charge termination and low-voltage cutoff without triggering fault flags on the instrument display.
• First-use calibration cycle: After installing this pack, run a full calibration cycle through the instrument menu before field deployment. The IO620 maps battery state during that sequence — skipping it causes premature low-battery warnings to appear on the first measurement session even when the pack is fully charged.

BMS lockout after the IO620 sat unused in a carry case for months

Li-ion cells self-discharge slowly during storage. If an IO620 sits unused long enough, the cell voltage drops below the BMS recovery threshold — typically around 2.5V per cell. At that point the BMS enters a protective sleep state and the instrument will not power on at all, even when placed on the charger. To recover, connect the pack to a compatible charger and leave it for at least 30–60 minutes without interruption; the BMS requires a low-current trickle before it will allow a full charge cycle to begin. If the instrument still shows no charging activity after that period, the original pack has likely dropped below recoverable voltage and replacement is the correct step.

IO620 shuts down mid-measurement when sensor or module initialises

When the IO620 powers up a pressure module or external sensor, there is a brief current spike as the module's internal circuitry initialises. On an aged or partially discharged pack, this spike causes a momentary voltage sag that crosses the BMS under-voltage cutoff threshold, and the instrument shuts off immediately — even if the battery indicator showed a healthy charge seconds before. This is not a firmware fault; it is a cell-impedance issue. A fresh pack with lower internal resistance handles the spike without the voltage rail dropping far enough to trip the BMS. Check that the pack rests at or above 3.6V under no load before beginning a measurement session.