Can I use lithium ion batteries with the Arduino uno board as long as I am in the 5v - 12v range ?
If you are connecting the battery to the input jack then the preferred voltage range for an Uno is 7 to 12v and 6v is the minimum.
The type of battery does not matter.
...R
Thanks for the input it does help but now I worry about the 4.2v - 6000mah. And is .6ah is equal to 6000mah ?
The "m" in mAh stands for "milli". Or one thousandth. 1000mAh = 1.000Ah
Don't confuse it with "M" because that's "mega" or a million times.
The "A" in amps is a capital-A because it is named after a famous scientist. Mr Ampere would like you to respect his name. (I don't know why the unit is called amp or ampere without the capital-A. Just one of those things.)
OK lol thanks.
Robin2:
If you are connecting the battery to the input jack then the preferred voltage range for an Uno is 7 to 12v and 6v is the minimum.
The minimum voltage drop in the regulator is 1.2V. If you want to get regulated 5V you need to supply at least 6.2V on VIN or 6.8V on the power jack (the jack has a reverse voltage protection diode with a 0.6V drop).
Warning: The regulator can provide up to 1000 mA of regulated 5V power, but only if you keep the input voltage below about 7.66V. For example if you use 12V for VIN you can only draw about 330 mA before the regulator overheats.
johnwasser:
For example if you use 12V for VIN you can only draw about 330 mA before the regulator overheats.
That would dissipate 2.31watt in the 5volt regulator.
Might last a minute before it's off to silicon heaven.
The regulator on an Uno shouldn't dissipate more than ~1watt long term in my experience.
Leo..
Wawa:
The regulator on an Uno shouldn't dissipate more than ~1watt long term in my experience.
Maximum power dissipation (PD) is maximum junction temperature (TJ(max) =150°C) minus the ambient temperature (TA, typically 25°C) over the thermal resistance, junction to ambient (RJA). The thermal resistance is 67°C/W for the DPAK package used on the Arduino. Fortunately the big copper pad on the PCB acts as a tiny heat sink and lowers the thermal resistance to 47°C/W. This makes the power limit 2.66 Watts (125°C / 47°C/Watt).
An Uno uses an SOT-223 regulator, not DPAK.
θ JA is more like 60-70C/watt with that area of board heatsink.
Please try to draw 330mA from the 5volt pin with 12volt on V-in.
And let us know how long it lasts before shutting down.
Leo..