Portable 5V power for my projects - I was about to get the necessary parts to wire up an OEM LiPo battery (3.7V battery, boost circuit, charging circuit) when I took a peak at pre-built "power banks". From all the sources I see the LiPo batteries alone cost more than the power bank, at much lower capacity. For reference:
- a 10400 mAh power pack (max output 3A @ 5V) is 26$ on Amazon
- a 10000 mAh power pack (max output 2.1A @ 5V) is 9$ on Hobby King
- a 2500 mAh LiPo is 17$ on Amazon
- a 5000 mAh Lipo is 8$ on Hobby King
The power packs already have charging and voltage regulation circuitry! The price difference makes me think I am missing something.
Reading around I notice issues with power packs auto-shutdown at low current draws. But other than this power packs seem cost optimal and technically equivalent - at least within the output amperage range of the power banks.
- Are there any technical differences in output voltage, lifetime, or otherwise I am missing here?
- Are there any "surprises" I'm going to face by using a power pack?
- Can you recommend a solid power pack that doesn't shut down at arduino level draws. (My app will draw 800mA @ 5V max, but during sleep, the draw of an Arduino Nano)