Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By torntrousers
#24607 I run some for weeks directly connected to a LIPO and so at about 4.2v when fully charged and they've been fine.

Though from thisabout sleep current vs supply voltage its not a great thing to do when using deepSleep. Also, with the latest July23 Arduino code it doesn't seem to work much over about 3.7v and just crashes at startup now, does anyone else see that?

alonewolfx2 wrote:Yes I don't recommend. But my one module working with 5v lcd on 5v power and it still working(59 days)
trackerj wrote:
Mario Mikočević wrote:Heya,

do you connect 18650 directly or through step-down to 3.3V ?
Isn't fresh battery voltage of slightly over 4V too much for ESP ?

--
Mozz
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By alonewolfx2
#24638 no. my modules working fine. just one thing. i measured deepsleep voltages and it seems esp consumes almost 3ma in deepsleep modes if voltage bigger than 3.6v soo maybe esp has something like internal regulator
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By nemik
#24654 Someone recommended the XC6206P332MR part which looks pretty good to provide 3.3v across the range that a Li-Ion battery might be at, so acting like a buck-boost DC converter. I ordered a bunch since they're only like $3 for 50 and will see how it goes.
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By GigAHerZ
#24698 I'm using this one: http://www.ebay.com/itm/2A-DC-5V-23V-to ... 1667714648

It doesn't waste excess voltage to heat as it's a buck converter instead of voltage regulator. (Kind of like step up converter, but it's stepping down)

Input can be anywhere between 5-23V and output is nicely 3.3V. Max current is 2A.

I just made a wifi controllable RC car, that uses 2x18650 li-ion batteries. Motors work directly from 7.4V (2x3.7V) and the motor driver is controlled by ESP8266-12 powered with before mentioned buck converter.