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Thank you for this documentations, however it's not a L293D chip on these boards: the pinout does not match! But the manufacturer of these boards has been very careful to strip down the chip markings... but the L293D would not contain MOSFETs either... I found an image with complete chip code on Alibaba, it's either an MX130B or MX1308.
Getting Started with Electronics
He will not be able to destroy (or charge) any lithium battery with this reverse fan. You might get a certain open-circuit voltage out of a "generator" like this, but there is no way it will deliver any significant amount of power (current times voltage).You have just to compare a high quality hub dynamo which delivers 2.4 W with this fan - you cannot turn a wheel attached to such a dynamo by just blowing, yet riding along you don't notice the extra resistance. What happens with the fan if you actually try to extract power is that it will simply not rotate anymore...
if - only if! - this wind turbine would be anywhere close to producing 2-3 W of electric power (which could charge a smartphone in a mere 3 hours) it would produce at least a comparable drag on the bicycle. Just imagine it dangling on one side of the handle as in the photos ;)
Simple Dual Axis Solar Tracker
My First CNC Machine
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