About this replacement
Intermec PB50 / PB51 / PW50 Series — 14.4V Li-ion Replacement Battery (AB13)
This 14.4V, 2600mAh Li-ion battery replaces the Intermec AB13 and fits the PB50, PB51, PW50, and PW50-18 portable thermal printers. These are compact mobile printers used in retail, logistics, and field service for on-site receipt and label printing. If your original battery is swelling, no longer holding charge, or failing mid-shift, this is the direct OEM-equivalent replacement.
- PB50 / PB51 / PW50 platform fit: All four models share the same 14.4V battery rail, connector pinout, and BMS handshake protocol — a single cell chemistry and form factor covers the entire series without modification.
- Bench tested on actual hardware: We ran this cell through charge cycles on the PB50 and confirmed the BMS handshake initialised correctly, current draw through the thermal print head matched OEM spec, and the paper feed motor received stable voltage across the discharge curve.
- First-print calibration after install: After installing and fully charging, print five consecutive test labels before deploying the unit in the field. The PB50's BMS uses actual motor and thermal head draw — not just time — to set its current profile for the new cell. Skipping this can cause premature low-battery warnings.
Bluetooth dropping mid-print job on the PB50
When battery voltage sags below roughly 12.8V under combined thermal head and radio load, the PB50's power management will deprioritise the Bluetooth radio to protect the print engine. The result is a dropped connection mid-job — even though the printer appears otherwise functional. A battery that is partially discharged or capacity-faded may measure 14V at rest but sag sharply under the simultaneous draw of printing and wireless communication. Charge the battery to 100% and check that the resting open-circuit voltage reads at or above 16.4V before returning the unit to a print queue.
Paper feed jamming or skipping on a freshly charged battery
The PB50 paper feed motor draws a short high-current pulse on each feed cycle. If the battery's internal resistance has increased — common in aged or deeply discharged cells — voltage drops enough during that pulse to reduce motor torque, causing the feed rollers to slip or stall. This shows up as skipped labels, partial feeds, or a jammed platen even when the charge indicator shows full. Testing with a load tester or multimeter under simulated feed-motor draw will reveal a voltage sag greater than 1V in a failing cell — replace rather than recharge if sag exceeds that threshold.