About this replacement
AEG Liliput AG1413 — 3.6V Ni-MH Replacement Battery (520103)
This is a 3.6V, 3000mAh Ni-MH replacement battery for the AEG Liliput AG1413 cordless handheld vacuum cleaner. It also fits the Liliput Classic 1 and FL36 AG303 models, which share the same voltage rail and connector format. Swap it in when the original cell can no longer hold a charge through a full cleaning session.
- Liliput AG1413, Classic 1, FL36 AG303 fit group: These models share a 3.6V single-cell Ni-MH architecture with the same connector orientation and physical cell format. One battery cell covers the entire group without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the AG1413 platform. The BMS accepted the cell without fault codes, and suction output held consistent across the discharge curve down to the low-voltage cutoff threshold.
- Dock charging habit on the AG1413: Do not leave this vacuum sitting on its charging dock continuously. Ni-MH cells in this format degrade significantly faster under constant trickle charge. Charge the unit fully, then remove it from the dock until the next use.
Suction dropping before the battery indicator reaches low on the AG1413
The AG1413 motor draws more current when airflow is restricted — a partially blocked filter forces the motor to work harder, pulling voltage down faster than normal. The battery indicator tracks voltage, not actual capacity, so it can still show mid-range while the cell is already sagging under load. This looks like a weak battery but is often a filter restriction. Clean the filter first, then retest suction performance before concluding the cell is at fault.
Motor cuts out mid-use and then recovers after a short pause
This is a BMS overcurrent trip, not a dead battery. When the motor draws a sustained high current — usually from a blocked nozzle or clogged filter — the BMS cuts the output circuit to protect the cell. After a brief rest the BMS resets and the vacuum runs again. Clear any blockage in the nozzle and wash the filter before recharging. If the cutout continues on a clean filter, check that the cell voltage reads at least 4.2V after a full charge.