If you replaced the battery yourself, it expected it will show as unverified.
If you had an unauthorized service provider replace the battery, it is expected it will show as unverified.
If the battery used was not official Apple battery (cheap knockoff) it is expected it will show as unverified.
If the battery is not charging then you have a bad battery or damaged something during the install.
If you had Apple or an authorized repair center replace it, take it back to be fixed.
If you did it yourself or had an unauthorized repair shop do it, good luck.