Portable Horn Battery Runtime
25 A @ 18 V load · li-ion Peukert · pack-condition derate
Battery platform
Pack capacity
Pick a common pack size or set a custom capacity.
Pack condition
Honking pattern
Wall-clock runtime
48.5 min
At 20% duty cycle (1s on, 4s off) the same pack keeps you honking for 48.5 min of total session time — about 582 individual blasts before the compressor stalls on a flat pack.
Power draw
Usable energy
How the math works
A portable handheld horn compressor pulls a measured 25 A at 18 V under load — about 450 W at the motor. On a higher-voltage pack the same wattage is split across more cells, so the per-cell C-rate drops and Peukert losses shrink.
I_pack = 450 W / V_nominal Ah_peukert = Ah × (Ah / I_pack)^(k − 1) k = 1.08 Ah_usable = Ah_peukert × condition_factor t_continuous = Ah_usable / I_pack t_wallclock = t_continuous / duty_cycle n_blasts = t_continuous / blast_seconds
Power-tool li-ion packs have a flatter Peukert curve than lead-acid (k ≈ 1.08 vs 1.2 for AGM), so a 5 Ah pack at 25 A gives close to its rated capacity — but cold cells, cycle wear, and BMS low-voltage cutoff still take a real bite. Treat the result as ±15%.