TSC Alpha 3R Replacement Battery 7.4V 3400mAh A3R-52048001

TSC Alpha 3R — 7.4V Li-ion Replacement Battery (A3R-52048001)

This 7.4V 3400mAh Li-ion battery replaces the OEM unit in the TSC Alpha 3R mobile thermal printer. It fits the Alpha 3R directly using the original part number A3R-52048001. The Alpha 3R is used in retail, logistics, and field service for printing labels and receipts on the move.

• Alpha 3R platform fit: The Alpha 3R uses a single-cell 7.4V Li-ion pack with a dedicated BMS handshake that controls both the thermal print head and paper feed motor. This replacement matches that voltage rail and connector configuration so the printer's power management logic recognises the pack correctly.
• Bench tested on actual hardware: We ran this battery through full charge and discharge cycles on an Alpha 3R unit. The BMS negotiated correctly, the thermal head reached operating temperature without voltage sag, and the paper feed motor drew consistent current through the test sequence.
• First-deployment print sequence: After installing, charge fully and print five test receipts before deploying in the field. The Alpha 3R's BMS sets its current profile for the thermal head based on early load draws — skipping this step can cause the printer to underestimate available capacity mid-shift.

Bluetooth dropping mid-job on the Alpha 3R

The Alpha 3R runs its Bluetooth radio on the same 7.4V rail as the thermal head. When battery charge drops below roughly 6.8V under load, the radio doesn't get enough stable voltage to maintain its transmission window. The printer appears connected in the app but drops the job at the point of print. Charge the battery above 7.2V before starting a batch job to keep the radio stable.

Print coming out faded or uneven on a freshly charged battery

The thermal print head needs a steady voltage to hold consistent head temperature across the full print width. If the BMS hasn't calibrated its discharge curve to the new cells, it can allow micro-sags during head activation — visible as faded bands or uneven density across the label. Running five to ten prints after a full charge lets the BMS map the cell's response curve. After that, print density should stabilise across the page.