Amazon.com: Made For Amazon, Battery Base in Black, for Echo (4th generation). Not compatible with previous generations of Echo or Echo Dot (1st Gen, 2nd Gen, or 3rd Gen). : Everything Else
ECHO, 58V, Battery - 492R63|CBP-58V2AH - Grainger
5.0Ah Lithium-Ion Battery | ECHO-USA.com
ECHO eFORCE 56V High-Capacity 5.0Ah Lithium-Ion Battery LBP-56V250A - The Home Depot
Echo X Series 12" Bar Chainsaw 56V Battery Top Handle Bare Tool DCS-2500T-12BT from Echo - Acme Tools