Wait… cyclists smoked? I knew they took alcohol, painkillers, and opiates back in the Tour de France just to bear those insane lengthy rides, but… smoking? really?
Smoking rises your hemoglobin level 
but definitely do not open the lungs as it was believed.
Michael Phelps and I would disagree (I disagree with no scientific evidence)
… or simpler, “I forgot to recharge XXX”, where XXX is one of the 15 things you must recharge in order to remove all excuses.
Yup… power meter, head unit, heart rate monitor, drivetrain, radar, action camera, etc. 
My watch, my blood sugar monitor, my foot temperature monitor, my wireless tire pressure monitor, my brain pressure monitor, my iPad, my laptop, my…
…your HUD glasses, bone conduction headphones, you cadence sensor, your speed sensor, your electric pump, your custom sound bell, your…
my Phone, front light, rear lights
My water bottle, my tire air pump, my defibrillator, my portable battery extender, my helmet light, my warming gloves, my cooling gloves…
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“But the batteries can run out. What then?” 
two words… dynamo hub
You only need one of these. Never run out of batteries again.
Guess I’ll just have to use that to make Di2 usable. /s
