About this replacement
Aetep AT110 — 7.4V Li-ion Replacement Battery (JQ050-04L)
This 7.4V 5000mAh Li-ion battery replaces the JQ050-04L pack in the Aetep AT110 surveying and testing instrument. It fits the AT110 directly and matches the original voltage rail and connector configuration. Capacity is 5000mAh (37Wh), sourced to match the original cell specification.
- AT110 platform compatibility: The AT110 uses a single battery bay with a dedicated BMS handshake line. This pack carries the correct cell configuration and protection circuit to satisfy that handshake — without it, the instrument throws a battery fault and will not boot.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on the AT110 platform, including probe initialisation loads. The BMS held stable through the inrush current spike at sensor power-up, which is where weaker packs trip the protection circuit.
- Pre-deployment calibration cycle: After installing this pack, run a full calibration sequence through the AT110 instrument menu before heading into the field. The instrument maps battery state during calibration — skipping this step causes the low-battery indicator to trigger early on the first measurement session, even with a full charge.
BMS cutoff when the AT110 initialises its probe or sensor module
When the AT110 powers up a connected probe, the instrument draws a short inrush current to initialise the sensor module. This spike can exceed the overcurrent threshold on worn or mismatched packs, triggering the BMS to cut output before the measurement session starts. The JQ050-04L replacement uses a protection circuit rated to handle this initialisation load without tripping. If the instrument still cuts out at probe power-up, check that the battery contacts are clean and seating fully — poor contact raises effective impedance and worsens the spike.
AT110 display showing erratic battery percentage after pack swap
The AT110 reads battery state by tracking voltage thresholds, not a dedicated fuel gauge IC. A new pack with a different cell chemistry profile will cause the percentage indicator to jump or read incorrectly until the instrument has logged a complete charge-discharge cycle. This is not a fault with the battery — it is the instrument recalibrating its internal voltage map to the new cells. Run the instrument through one full discharge to below 7.6V under normal field load, then charge fully, and the percentage readout will stabilise.