Safety: Do not continue using a battery that becomes very hot or shows physical damage.

Fully charge: Charge the battery until the charger indicates full.
Runtime test: Run the vacuum continuously and time how long it operates before stopping. If it is far below specification, the battery is weak.
Test another battery: Use a different Parkside battery of the same series. If runtime is normal, replace the weak battery.
Clean contacts: Clean the battery and tool contacts with isopropyl alcohol to ensure low resistance connections.

LED battery indicator shows full, but vacuum stops after a minute

Possible Causes