Druck ADTS Touch Replacement Battery 10.8V 5200mAh

Druck ADTS Touch / ADTS542F / ADTS550F Series — 10.8V Li-ion Replacement Battery

This 10.8V, 5200mAh (56.16Wh) lithium-ion battery replaces the internal pack in the Druck ADTS Touch, ADTS542F Air Data Test Set, and ADTS550F Series Air Data Test Sets. These are portable avionics ground support instruments used to simulate and verify aircraft pitot-static systems. The battery powers the touchscreen interface, test sequencing, and onboard data logging during field and hangar use.

• ADTS Touch, ADTS542F, and ADTS550F compatibility: These three units share the same 10.8V battery rail, connector pinout, and BMS handshake protocol, which is why a single cell works across the range. Voltage tolerance and communication lines are identical between the portable and semi-portable variants in this product family.
• Bench tested on actual hardware: We cycled this battery through charge and discharge under the load profile typical of pitot-static test sequences. The BMS communicated state-of-charge correctly to the host device, and protection circuits tripped at expected thresholds — no false low-battery events after the first full cycle.
• Post-swap power-on self-test: After fitting this battery, allow the ADTS unit to complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup, and cutting power during this sequence can register a false battery fault that persists until the next complete reboot.

Why the ADTS Touch triggers a low-battery alarm on a freshly charged replacement

The ADTS platform sets its low-battery alarm threshold against the BMS state-of-charge register, not raw terminal voltage. On a new cell, the BMS has not yet calibrated its internal coulomb counter, so it reports a conservative charge estimate — sometimes well below actual capacity. This causes the alarm to trigger even when the cell is near full. One complete charge-discharge cycle gives the BMS enough data to recalibrate the register accurately. After that cycle, the alarm behaviour returns to normal.

ADTS unit will not power on after the replacement battery sat in storage

Lithium-ion cells self-discharge during storage, and if a cell drops below approximately 2.5V per cell (7.5V pack total), the BMS enters deep-discharge lockout to prevent damage. In this state, the ADTS will not respond to the power button at all — it looks identical to a dead battery. Connect the unit to its mains charger and leave it for at least 30 minutes before attempting to power on. Most BMS controllers begin a trickle-recovery charge once external power is detected, and the pack will exit lockout once it crosses the recovery threshold — typically around 9V for this cell configuration.