Finding batteries for the ipod nano 2g is extremely hard in my area, so i was wondering if i could solder capacitors instead of batteries and use the ipod nano with a powerbank. What capacitance should i use?
#Are capacitors a viable replacement for battery in ipod nano? I can run it off a powerbank...
cold flame
You cannot use caps (or more like supercaps - as typical capacitor set would give you minor running time in are of seconds not hours) in place of batteries because of general difference in the way those work. The charging circuitry expects a specific behavior (for example: charging curve, resistance, working voltage range) from the power source.
Example issue: Putting a discharged capacitor would cause the iPod to detect a faulty battery (voltage below safe LiIon threshold) - even if you charge the cap in-circuit, in very short time it would get self discharged and you'd get into the same issue on every cycle.
So in theory yes, it is doable, but you need to heavily modify the power management circuitry - not really doable in any ipod sized device, not to mention ipod nano.
Bigger battery - answer is obvious - you need to keep it outside 🙂
wide delta
You cannot use caps (or more like supercaps - as typical capacitor set would giv...
how would 18650s work, im worried about wobbling the cable and losing power
could i use capacitors to stabilize the connection instead, or can i just deflate the expanded battery and put some tape on it instead
cold flame
18650 has nearly identical chemistry to the internal liion flat package - it should work but I have no idea how the software can react to such a giant battery (compared to the original).
cables should be soldered to avoid any shorts - shorting the LiIon battery can have dramatic consequences.
also deflating (piercing effectively) the expanded battery can cause it to catch fire - air (mostly water vapor in the air) + Lithium usually causes fire. That is why there the cells are usually hermetic and well mechanically protected and have charging circuitry that keep the temperature and voltage in check.