About this replacement
Kress 180 AFB Series — 18V Li-ion Replacement Battery (PF 180/4.2)
This is an 18V Li-ion replacement battery rated at 5000mAh (90Wh) for the Kress 180 platform. It fits the 180 AFB, APF 180/1.5, and APF 180/2.1 cordless tools. The OEM part number PF 180/4.2 confirms the correct BMS profile and connector for this series.
- 180-series platform compatibility: The 180 AFB, APF 180/1.5, and APF 180/2.1 share the same 18V rail voltage, connector footprint, and BMS handshake protocol — which is why a single cell pack covers all three models without modification.
- Bench tested on actual hardware: We ran this pack through cold-start drill cycles and sustained saw loads. The BMS held the overcurrent threshold during motor-start inrush and did not trip under repeated full-load engagement.
- First-use load conditioning: On initial use, run the tool at half load for two cycles before pushing maximum torque applications. This allows the BMS to profile the motor's inrush current draw and calibrate overcurrent thresholds before high-demand cuts.
BMS cutoff on motor-start inrush during drilling or sawing
When a Kress 180-series motor starts under load, it draws a spike of current that can be three to five times the steady-state draw. If the BMS detects this inrush as an overcurrent event — especially on a new or cold pack — it cuts the output rail to protect the cells. This is not a faulty battery; it is the protection circuit responding to an uncalibrated threshold. Running two half-load cycles first lets the BMS log the motor's start signature and set a realistic trip point.
Charger not recognising the pack after extended storage
Li-ion cells that sit unused for several months can self-discharge below the charger's acceptance voltage — typically around 2.5V per cell. When the pack voltage drops that low, the Kress charger sees it as a fault condition and refuses to begin a full charge cycle. To recover the pack, leave it on the charger for 10–15 minutes; most Kress chargers include a trickle pre-charge mode that will bring individual cells up to approximately 3.0V before switching to the main charge algorithm. If the charger does not respond after 20 minutes, check each cell group with a multimeter — any group reading below 2.0V indicates a cell that will not recover.