Brady TLS PC Link Replacement Battery 7.2V 2000mAh M-BATT-18801

Brady TLS PC Link Thermal Labeling System — 7.2V Ni-MH Replacement Battery (M-BATT-18801)

This 7.2V, 2000mAh Ni-MH battery replaces the original pack in the Brady TLS PC Link portable label printer. It fits both the TLS PC Link and TLS PC Link Thermal Labeling System. Capacity is rated at 14.4Wh, matching the original pack specification.

• TLS PC Link platform fit: Both the standard TLS PC Link and the Thermal Labeling System variant share the same battery bay, connector pinout, and 7.2V supply rail. The BMS handshake is identical across both units, so one pack covers the full platform.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a TLS PC Link unit. The BMS accepted the pack without fault codes, the thermal head reached operating temperature correctly, and the paper feed motor drew current within the expected profile throughout the test cycle.
• First-use conditioning for thermal printers: After installing, charge the pack to full before powering on. Then run at least five consecutive label print jobs before field deployment. The TLS PC Link's BMS uses early current draw from the print head and feed motor to calibrate its state-of-charge tracking — skipping this step causes the low-battery indicator to trigger prematurely.

Why the TLS PC Link stops printing after sitting unused for weeks

Ni-MH cells self-discharge faster than lithium chemistries — roughly 1–3% of capacity per day at room temperature. A TLS PC Link left on the shelf for three to four weeks can drop below the minimum voltage the thermal head needs to reach printing temperature. The printer may power on and show a ready state, but the head never gets enough current to fire correctly. Charge the pack fully before attempting any print job after storage longer than two weeks.

Faded or uneven print density on a freshly installed battery

The TLS PC Link thermal head requires a stable, consistent voltage to maintain the correct element temperature across the full print width. If the replacement pack hasn't been fully conditioned, voltage sags slightly under load and the head temperature varies mid-stroke, producing labels with faded bands or inconsistent character weight. This is not a head fault — it's a cell output issue during the early charge cycles. Charge fully, print five calibration labels, and check that voltage at the battery terminals stays above 6.8V under print load before treating the head as faulty.