About this replacement
DATECS BlueCase 50 / BluePad 5500 Plus — 3.8V Li-Polymer Replacement Battery (1ICP6/58/63)
This 3.8V, 2300mAh lithium-polymer cell replaces the OEM battery in the DATECS BlueCase 50 and BluePad 5500 Plus mobile thermal printers. Both devices use the same 1ICP6/58/63 cell format with matching connector and BMS handshake. Capacity is 8.74Wh — unchanged from the original specification.
- BlueCase 50 and BluePad 5500 Plus compatibility: Both models share the same 65.20 x 58.10 x 5.30mm cell footprint, identical connector pinout, and the same BMS communication protocol. One cell fits both without modification.
- Bench tested on actual hardware: We ran the cell through full charge cycles on the BlueCase 50 platform. The BMS accepted the cell without error flags, current draw during paper feed motor activation stayed within spec, and thermal head voltage held stable across repeated print sequences.
- First-use print calibration: After installing, charge to 100% and run five consecutive test receipts before deploying in the field. The paper feed motor draws a brief current spike on each cycle — this sequence confirms the BMS current profile is correctly mapped to the new cell and prevents false low-battery cutoffs on the first shift.
Voltage sag at the thermal print head during high-density label runs
The BlueCase 50's thermal head pulls peak current during high-density black coverage — barcodes, bold logos, and full-width lines hit the cell harder than plain text receipts. A degraded or deeply discharged cell cannot sustain the required voltage during that peak, so the BMS throttles output to protect the cell. The result is a mid-job cutoff or a visibly faded label on the same print run. A fresh cell at full charge resolves this — the cell needs to hold above 3.5V under load to maintain consistent head temperature.
Bluetooth dropping mid-job after the battery icon shows half charge
The BlueCase 50's Bluetooth radio requires a stable voltage supply separate from the motor and thermal head circuits. As a lithium-polymer cell ages, its internal resistance rises — voltage sags under combined motor and radio load even when the state-of-charge indicator reads 40–50%. The radio loses its power floor first, causing the connection to drop before the printer reports low battery. If disconnects stop after fitting a new cell and charging to 4.2V, the original cell's internal resistance was the cause.