Shure Portable Dual Battery Charger w/ Power Supply $300 Model: SBC210 SB900A Lithium-Ion Rechargeable Battery $100
https://www.long-mcquade.com/76442/Pro-Audio---Recording/Accessories/Shure/Portable-Dual-Battery-Charger-W--Power-Supply.htm
https://www.long-mcquade.com/77394/Pro-Audio---Recording/Headphones/Shure/SB900A-Lithium-Ion-Rechargeable-Battery.htm