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The biggest issue I found with this ESP module, is that the over-discharge protection doesn't seem to function at all. I forgot one of these in deep sleep mode for about 15 days and after realizing it when I checked the battery voltage, it had dropped down to 1.7V which is pretty bad for a lithium cell. There is also no low battery indicator which makes situations like this even more likely to happen. Of course, adding my own low battery indicator shouldn't be too hard, but still this is pretty basic functionally that you expect on a product like this. It's about safety, lithium cells should never been discharged under 3V as doing so can permanently damage the cell. Because of this issue, even though I have tested the product and in fact I really like it, I'm forced to not recommend this. If you've decided to buy this anyway, please make sure that you know what you're doing and also you have the knowledge to address the issues mentioned above. At the very least add a low battery indicator so you'll know when you should charge it and definitely use it with a 18650 cell that has built in battery protection. Another problem I had with these boards is the really poor quality micro USB connectors. On 2 out of the 4 boards that I have, the micro USB connector completely failed in less than 10 cycles.Read full review
Verified purchase: No
this circuit consumes a lot of power and so it is not good to work long time battery-powered
Verified purchase: Yes | Condition: New
Great price, All in one solution for esp projects. A bit bigger than I expected with 18650 Lithium battery attached...
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New