Samsung AB663450GZ/AB663450GZB/AB663450GZBSTD Lithium Ion Battery for Convoy U640 - Original OEM - Non-Retail Packaging - Blue This battery is a 3.7 volt lithium ion battery that is rated at 1300 mAh. This battery is specifically designed for your Convoy and is optimized to provide the longest lasting talk and standby times. durable and long lasting power source to your Samsung Convoy U640. This Samsung battery is made with the latest in lithium ion technology to provide the an ultra lightweight.