Hi Loubylou,
16d a children’s author requires a central letter to be removed to give the first 6 letters, then 2 letters for a hesitant expression.
26a parses 4 (having lost bronze) + 2 (a famous Farah).
I would have thought the bars refer to the battery life rather than what the clue is referring to! It was obvious because it was clearly the rhyming pair anyway.