There are no true Antivirus Products available for iOS/iPadOS. Those that claim to provide AV protection are little more than “snake oil” - are pointless - and should generally be avoided. The iOS/iPadOS sandboxed architecture will effectively inhibit any form of “virus scanning” - as Apps can only access their own “sandbox” within which their own system files and associated data are located.
Due to the system architecture of iOS/iPadOS, unless jailbroken, your iPad is not susceptible to traditional malware infection per-se. However, as with all computer systems, there are still vulnerabilities and exploits to which you remain vulnerable. For older devices, no longer benefiting from regular security updates, the risk of an unpatched vulnerability being exploited increases. As your iPad Air3 (as identified by the tags appended to your post) this is unlikely to be a concern - as your iPad is capable of update to the most recently released version - iPadOS 15.6.1.
As described, your iPad is exhibiting typical symptoms of a failing battery. Start by connecting your iPad to its Power Adapter and allow the iPad to charge undisturbed for at least an hour - or preferably overnight. This step is advised as a battery with very low charge, or is failing, may produce symptoms that emulate a boot loop - as described.
If the problem fails to stabilise, whilst still connected to the Power Adapter, attempt a forced restart of the iPad:
- On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
- On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

If iPad still doesn’t turn on, or if it gets stuck during start up, see the Apple Support article If your iPhone, iPad, or iPod touch won't turn on or is frozen. Or if your iPad isn’t working correctly after you restart it, see the iPad Support website.
If your iPad is stuck is actually stuck in a boot-loop, you’ll need to resolve this specific issue - which may entail “restoring” the most recent version of iPadOS to the iPad. This support page outlines restoration of an iPad to Factory Settings:
Restore your iPhone, iPad or iPod to factory settings – Apple Support
You’ll need access to either a PC (with iTunes installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of MacOS).
Download and use iTunes for Windows – Apple Support
Update to the latest version of iTunes – Apple Support
Use of a PC or Mac computer is unavoidable. If you don’t have access to a suitable computer of your own, that of a helpful friend or family member will suffice. Alternatively, the technicians at the Genius Bar of your local Apple Store or Apple Authorised Service Provider (AASP) will be delighted to assist.
If you continue to experience difficulties, you might be best advised to seek assistance directly from from Apple Support - and request a remote diagnostic test. You can contact the Support Team using the Get Support link at top-right of this page. Alternatively, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:
https://apps.apple.com/gb/app/apple-support/id1130498044