VT
Charge fully then use as you wish.
Don't listen to scare stories, they are urban myths concerning an obsolete battery type promulgated by self-aggrandising help-desk simians.
The 'memory' effect in NiCad batteries (no longer available) was caused by whiskering. During charge, metal was deposited unevenly and the electrodes grew localised whiskers which limited the chargeability.
Don't worry! Equipment designers do all the worrying for you.