Typically, most Apple store locations DO NOT do any type of repairs or actual iPad battery replacement.
To expedite quick and speedy customer service, many Apple store locations will ONLY offer in/out-of-warranty device replacement for any iPad repair or battery replacement circumstance.
A device replacement, in lieu of an actual battery replacement, for an iPad is $99 U.S.D., plus tax.
Time to use the “Support” link, in the top black Apple Website menu bar, at the upper right hand corner of every Apple Support Community Webpage to attempt to schedule an appointment with your nearest Apple Store location to have your iPad evaluated/diagnosed and options presented to you.
Apple Store employees will be glad to help/assist you.
Sorry & Best of Luck to You!