Battery Formulas
Battery formulas let you predict runtime, estimate usable capacity, and translate between C-rate and current draw. These calculators help you size packs for a target endurance and understand discharge behaviour. They are vital for portable, off-grid, and IoT power budgeting.
Battery Formula Calculators
- Battery Runtime t = Capacity / Current
- Battery Energy E = V × Capacity
- Battery Loaded Voltage Vload = Voc − I × Rint
- Battery Charge Time t = Capacity / Icharge
- Battery Self-Discharge Crem = C0 × (1 − rate)^days
- Battery Temperature Derating Ceff = Cnom × factor
- Cell Balancing Current Ibal = ΔV / Rbal
- State of Charge (Coulomb Counting) SoC = SoC_init + (I × t / Q) × 100
- Battery Internal Resistance Rint = (Voc − Vload) / I
- Battery Pack Series-Parallel Vpack = Ns × Vcell, Qpack = Np × Qcell
- Battery Cycle Life Capacity Fade Qn = Q0 × (1 − fade)^n
- C-Rate to Current I = C_rate × Q
- Battery Voltage Sag Vsag = Voc − Crate × Q × Rint
Related Formula Categories
Browse the full formulas index for all 32 categories.