These things are great. I'm using it to power a Raspberry Pi 3 with two 18650s and I've had no low voltage issues even with multiple USB devices connected. Many or other of my 2A USB chargers weren't powerful enough to power it. The only problem is that the indicator doesn't turn red at 3.6V and I haven't seen it turn red yet. I will do some tests to see at what voltage it changes. You may need to use a liposuction protection circuit to ensure your batteries don't run out. If you use alkaline batteries this is not a problem, they will just die.
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