About this replacement
Stihl HSA 25 Cordless Shrub and Grass Shears — 10.8V Li-ion Replacement Battery
This listing is for a 10.8V, 1500mAh lithium-ion replacement battery for the Stihl HSA 25 cordless shrub and grass shears. The HSA 25 runs on Stihl's proprietary 10.8V battery platform — this pack matches that voltage rail and connector exactly. Capacity is 1500mAh (16.2Wh), sourced to the original specification for this tool.
- HSA 25 platform compatibility: Stihl's HSA 25 uses a closed battery platform that does not share connectors or BMS logic with the HSA 26 series — this pack is built specifically for the HSA 25 voltage and communication requirements.
- Bench tested on actual hardware: We ran full charge/discharge cycles on this pack — the BMS held voltage steady under load and tripped the low-voltage cutoff cleanly without dropping the shears mid-cut.
- First charge before use: Fully charge the pack before the first session with the shears — Li-ion cells bed in better from a full state of charge on the initial cycle.
Why the HSA 25 battery is not interchangeable with other Stihl packs
Stihl segments its cordless range by voltage platform and connector format. The HSA 25 sits on a 10.8V rail that is physically and electronically separate from larger Stihl battery systems. Attempting to fit a pack from another Stihl line will fail at the connector — the housings do not align. This replacement matches the HSA 25's specific form factor and BMS handshake.
Shears cutting out suddenly — what's happening and how to fix it
If the HSA 25 cuts out mid-use without warning, the BMS has hit its low-voltage protection threshold. This is not a fault — it prevents cell damage from over-discharge. Remove the battery, let it rest for two minutes, then place it on charge. If cutouts happen earlier in each session over time, the pack's capacity has degraded and replacement is the correct next step.