Formulas

Intervals (ms)  =  60 000 / rate (bpm)

Ohms Law: V (A)  =  I (current) x R (Ω)

Energy (J)  =  V² / R (Ω) x t (s)

Charge/Q (µ coulombs)   =   I (mA) x t (ms)

Battery Life (hours)  =   bat capacity (Ah)/ I (A)

Power (watts)  =   I (A) x V (V)