ESP8266 Community Forum

- Thu Dec 18, 2014 8:15 pm #5122 This one look quite interesting as well: http://www.belling.com.cn/upload/bl8530_en.pdf
Quiescent current is below 7µA and it can supply 300mA @ 3.2V with 1.8V input voltage. The downside however is availability: I haven't found this chip anywhere but on aliexpress (but there are tiny modules available as well).

- Sun Dec 21, 2014 10:07 pm #5371

Thank you for comment. Please look at more detail about these batteries from another brand :- http://www.varta-microbattery.com/appli ... _er_en.pdf, As I know, its price below 3USD for 1200mAh at 1ku.

According to the datasheet the 1.2Ah model has a max. pulse discharge current of 80 mA (using 100ms pulses every 2min.) while the ESP8266 has a max. consumption of 300mA. I'm not an electrical engineer, but these numbers just don't add up...
You're welcome to try using capacitors to compensate for current spikes, but looking at the numbers, I don't think it's worth the time & effort. Even at 3USD/piece these batteries don't seem very economical. Good AA batteries have about 3.9Wh (using numbers from wikipedia) and cost 50 cent or less at consumer quantities, while the 1200mAh Lithium Thionyl Chloride battery has 4.32Wh at 6 times the price. The MCP1640* costs about 70 cent in single quantities, so even if you add the one time additional cost of the boost converter, using 2 AA batteries costs about the same for the first charge, but give you almost twice the capacity.

*) there might be cheaper or better boost converters, I'm just sticking with the MCP1640 as example since it's the first chip I found that seemed suitable.

Thanks again for your comments. Good points. By the way anyone know about working temperature range of alkaline AA battery? Actually I'd like to use in extreme low temperature about -20 Celsius that I have some experiment with Lithium Thionyl Chloride (but not for ESP8266)

Thank you.

- Mon Dec 22, 2014 5:48 pm #5478 An inexpensive choice for Li-Ion batteries to power a sensor node would be Sony Playstation PS3 controller batteries. These put out 3.7V at 1800mAH, have a simple JST connector, and are available almost everywhere for dirt cheap.

battery.jpg

You can also integrate a TP4056-based module into your node for charging via USB cable.

tp4056.jpg

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- Wed Dec 24, 2014 10:01 am #5613 This IC has some potential: LD39130SJ33R, in particular, current consumption lower than 0.1 μA in green mode and capable of delivering 300mA...

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