The seven-times European Cup winners lead the standings ahead of holders Barcelona’s visit to Viktoria Plzen in the other game in the section later on Tuesday.
Milan’s Sweden striker Zlatan Ibrahimovic put the visitors ahead in the 22nd minute after taking the ball off a defender, giving it to Robinho and then calmly slotting in the return pass with the home defence nowhere.
The Italian champions dominated the first half but BATE improved markedly after the break and equalised in the 55th when Brazilian Renan Bressan converted a penalty after Ignazio Abate barged down Artyom Kontsevoi.
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