Question APC UPS fan question

Jun 1, 2019
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I ordered an apc back ups today and before using it on some costly equipment i wanted to test it, So far no sparks like the last one i returned, but the occasional brrrt sound while changing between battery and mains which (i think) is normal, but one thing i noticed is when the ups isnt connected to anything and i have the main supply on with ups power off and switch it off after sometimes without
touching the ups power button the fan starts running for a short while, So is this normal? i thought it was supposed to switch on fans during the charging process to cool down the battery or something? not after disconnecting it?
 

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