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Parallel LED not achieving expected current from 18650 battery pack and Boost converter

This is kinda a follow up to a previous question I asked here: Parallel 18650 battery pack voltage not stepping-up with Boost converter. Why? I have now added the correct boost converter to my 20 LED ...
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Parallel 18650 battery pack voltage not stepping-up with Boost converter. Why?

I'm new here and I hope this is the right place to ask! I have assembled a 6P 18650 battery pack out using Samsung 25R cells, soldered altogether with Nickel strips, effectively giving me 3.7V 15Ah. ...
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Can I use dc-to-dc converter to step up voltage of 20 3.7V 3Ah lithium-ion batteries connected in parallel?

I want to use this 3.7V 40Ah powerbank to power my e bike's 48V hub motor. So would it be a bad idea to step up 3.7V all the way up to 48V? Would there be a huge Ah loss?