We don't have specific guidelines or requirements for 18650 batteries. Theoretically, they all work fine, and most of them sound alright with C9. The 10A discharge rate will benefit the headroom and transient of the amplifier but batteries with 5A discharge rate are valid options. Be reminded that the discharge rate is NOT the only factor that matters. We didn't pretend we know a lot about battery manufacturing, so we can't explain whether the changes in tonal characteristics are related to the material or the special formula of the battery.
I have tested the Panasonic NCR18650GA and they sound very good with C9, if the Orbtronic are out of stock, maybe you can consider the Panasonic.
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affects the overall sound signature
Thanks a lot @Andykong for confirming this information
Actually, I'm more concerned in adding listening time to the C9 (Sonic changes is a bonus for me). So I'm now eyeing on 3500mAh capacities.
Thanks for the feedback on Panasonic NCR18650GA - I was specifically looking at this and LG MJ1.
EDIT: Follow-up question @Andykong regarding the NCR18650GA - did you use the protected or unprotected model?
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