Product details:

BA-503 - Inogen One G5 External Battery Charger With Power Supply - Product Features: Recharge in under 4 hours (Single) Recharge in under 8 hours (Double) LED indicator light The Inogen One G5 External Battery Charger is the perfect source for simultaneously recharging your additional Inogen G5 single and double batteries. A fully depleted G5 Single Battery can be charged to full in 4 hours and a fully depleted G5 Double Battery can be charged to full in under 8 hours. The charger includes an AC power supply.