About this replacement
DYMO XTL 300 / LabelManager 500TS Series — 7.4V Li-Polymer Replacement Battery (1814308)
This 7.4V, 1300mAh Li-Polymer battery replaces part number 1814308 in the DYMO XTL 300 and LabelManager 500TS series portable label printers. It fits a cross-compatible group of handheld thermal labeling devices used in warehouses, retail floors, and field service. Capacity is 9.62Wh — matching the OEM specification from DYMO part 1814308.
- XTL 300 and LabelManager 500TS family: These models share the same 7.4V nominal rail, identical connector pinout, and a common BMS handshake protocol — which is why a single cell pack covers the full group including the LabelManager Wireless PnP variant.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the XTL 300 platform, confirmed the BMS negotiated correctly with the printer's charge controller, and verified thermal head voltage held steady across a sustained print run.
- First-use print sequence: After installing, charge the pack fully, then print five test labels before deploying the unit in the field. The XTL 300's feed motor draws a brief current spike on the first actuation — completing this sequence lets the BMS log the correct current profile for that motor and prevents a false low-power cutoff during your first real job.
Why the XTL 300 thermal head produces faded or uneven labels at low charge
The XTL 300's thermal print head uses resistive heating elements that require a stable voltage to reach the correct activation temperature across the full print width. When cell voltage sags — typically below 6.8V under load — the head temperature drops unevenly, and you get labels where characters are faint on one side or bands of text are missing entirely. This is not a head fault; it is a voltage delivery problem. A fresh, fully charged pack at 7.4V nominal resolves it immediately.
XTL 300 powers on but won't feed tape after sitting unused for weeks
Li-Polymer cells self-discharge at roughly 2–3% per month, but the BMS on this platform has a minimum operating threshold near 6.5V — below that, the printer will power up the display but block the feed motor as a protective measure. If the unit has been shelved, the pack voltage may have drifted below that threshold even though the screen looks normal. Connect to the OEM charger and let it reach at least 7.0V before attempting a print job — most units resume normal feed operation at that point without any reset procedure.