A novel low-cost aluminum–graphite dual-ion battery is reported. The battery shows a reversible capacity of ≈100 mAh g⁻¹ and a capacity retention of 88% after 200 charge–discharge cycles. A packaged aluminum–graphite battery is estimated to deliver an energy density of ≈150 Wh kg⁻¹ at a power density of ≈1200 W kg⁻¹, which is ≈50% higher than most commercial lithium ion batteries.