About this replacement
Autec Funkfernsteuerung Air / Dynamic / Modular Series — 7.4V Li-ion Replacement Battery (LPM02)
This 7.4V 1400mAh Li-ion battery replaces the Autec LPM02 (also cross-referenced as R0BATT00E08A0) in the Funkfernsteuerung Air, Dynamic, Modular AJM, AJR, and compatible Autec crane remote control systems. It powers the radio transmitter unit used to operate overhead cranes, hoists, and industrial lifting equipment. Voltage and cell count match the original pack exactly.
- Air, Dynamic, and Modular platform compatibility: These Autec transmitters share the same 7.4V dual-cell architecture, LPM02 connector pinout, and BMS handshake protocol — which is why one battery pack covers the full range from the compact Air unit to the larger AJM and AJR modular controllers.
- Bench tested on actual hardware: We cycled this cell through repeated transmit bursts and solenoid-activation events. The BMS held voltage above the transmitter's low-battery threshold throughout, and cutoff engaged cleanly at the expected cell floor without triggering a hard lockout during active transmission.
- Idle-period charge maintenance: Crane remotes often sit unused for weeks or months between jobs. If the transmitter is stored without a charge, the Li-ion cells can drop below 2.5V per cell — at that point the BMS enters deep-discharge lockout and the pack will not respond to a standard charger. Charge the battery once a month during any idle period to prevent this.
Solenoid activation causing power dropout on a freshly installed battery
When an Autec transmitter triggers a crane relay or solenoid, the inrush current spike is brief but sharp. A cell at partial or storage-level charge has higher internal resistance, and that spike can push the instantaneous draw past the BMS overcurrent threshold — cutting power mid-command. This looks identical to a dead battery even though the pack reads a non-zero voltage. The fix is straightforward: charge the replacement fully before putting it into service. A full charge lowers internal resistance and keeps the BMS from tripping on legitimate load events.
Transmitter showing low-battery indicator immediately after swap
A new Li-ion pack ships at storage voltage — typically 3.6–3.7V per cell, which is intentionally below the 4.1–4.2V full-charge ceiling. The Autec transmitter reads cell voltage directly to drive the battery indicator, so a pack at storage voltage will trigger the low-battery warning as soon as the unit powers on. This is not a faulty cell. Connect the battery to the Autec charger and bring it to full charge — the indicator will clear once cell voltage reaches the normal operating range above 3.9V per cell.