What Does an E-Bike Battery Really Cost to Charge in 2025?
What Does an E-Bike Battery Really Cost to Charge in 2025?
Cheaper than a flat white ☕ — crunch the numbers below.
2025 electricity rates we used
| Tariff | Unit rate (p/kWh) | Source |
|---|---|---|
| Ofgem price-cap (Jul–Sep 2025) | 25.73 p | Ofgem press note |
| Octopus Go off-peak (00:30–05:30) | 8.50 p | Octopus FAQ |
Real-world cost per full charge
Formula: (V × Ah ÷ 1000) × unit rate + 10 % charger loss.
| Pack | Wh | Std 25.73 p | Off-peak 8.5 p |
|---|---|---|---|
| 36 V 7.5 Ah | 270 | ≈ £0.08 | ≈ £0.03 |
| 36 V 10 Ah | 360 | ≈ £0.10 | ≈ £0.03 |
| 48 V 15 Ah | 720 | ≈ £0.20 | ≈ £0.07 |
| 52 V 20 Ah | 1040 | ≈ £0.29 | ≈ £0.10 |
🔍 DIY cost calculator
Cost per full charge: —
How to keep it even cheaper
- Schedule off-peak. Smart plug + Octopus Go ≈ 70 % off.
- Stop at 80 % daily. Lower cost and double battery life.
- Keep it cosy. Charge at 15–25 °C for best efficiency.
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