Pilot Automotive CA-9911PK4 USB AAA Rechargeable Battery, 4 Pack (USBCell ECO);

Each Eco Cell lithium polymer battery is equipped with charge overload and can be recharged in any powered USB 2.0 or 3.0 port, so your in-car charger, computer or power bank is also a battery charger. Each durable battery is designed for 500 recharging cycles, minimal self-discharge when idle, and is engineered to deliver a consistent 1.5V / 1040 mAh of power. Perfect for home, auto and camping.