[quote=HKJ]
[quote=DroneFisherMan]
It is the same story, NiMH (Eneloop) starts at about 1.4V when full and are empty at about 1.0V, this matches Alkaline fairly well (Except a few devices)
I do also have a lot of AA/AAA curves: Battery test-review 18650 comparator
Top part is rechargeable batteries (NiMH), bottom part is primary batteries (Alkaline)
I thought 2 cell is 2s which means 3.7 x 2 = 7.4 V
Am I right?
As I wrote above that matches Alkaline fine enough.
Oki doki bro. Thanks
When charged it will start a bit above 11V and then drop to 8 volt during use.
It is eight AA sized NiMH cells.
I doubt they are low self discharge types, i.e. they will self discharge in less than a couple of months
If its rechargeable then volt should be 1.2V and 8 AA means 9.6V? Right?
My concern is will it burn my circuit board if i supply more than 9 V?
Thanks for taking time to help me out
No, for rechargeable batteries the voltage is some sort of average voltage, that means when charged the voltage will be higher and when empty the voltage will be lower.
At higher load a NiMH battery will have higher voltage than a Alkaline cell, even though it is only rated 1.2V and Alkaline is rated 1.5V. I wrote a bit about it here: Comparison of AA battery chemistry
thanks man
so last question then I am done eating your brain
If i use that 9.6V battery will it burn the electronics inside compared to 9 V LiIon rechargeable battery you said could give me some performance
Conclusion
The voltage printed on the cells, do not have much relation to actual voltage when using the cell.
Alkaline marked with 1.5 volt has lower voltage than NiMH marked with 1.2 volt at higher loads (Like a flashlight on high). At very low loads alkaline will be better than NiMH.
Lithium is the top performing chemistry for high voltage, high capacity and fairly high current at the same time (It is also the best at low temperature).
NiZn has too high voltage and with the short lifetime it is not really interesting.
LiIon may be interesting for devices that requires more voltage than NiMH can provide, but watch out for the self discharge.
+1 for this info man!
Probably not, but there is no guarantee.
After reading that article on actual voltage and voltage under load, I have decided to buy eneloop AA 1.2 rechargeable batteries. I hope i get desired voltage to run the Tx
Even though it needs 9V
My guess is that (radio control transmitter/receiver?) device has a set of 6x AA cell slots. How much time does a set of alkalines last? Knowing that gives a hint about the kind of current/power drain of the transmitter, and I guess a set of alkaleaks won't last long.
“9V” is just a voltage rating, probably obtained from this 6 × 1.5V alkaline nominal voltage based calculation. Devices powered by batteries are designed to work on a broad voltage range, usually from at least a bit above rated value to way below it. At times I wish they were to make this information available to the consumer somewhere, like “working voltage range: 11 - 6V”, plus current and/or power consumption.
Not long ago I modified an old kitchen scale which had a slot for “9V” cells. I plugged it to an old mains adapter from which I could read way above 11V. Nothing burned, though.
Cheers ^:)
Originally posted on Thu, 08/09/2018 - 14:29. Edited for a fixup.
Yup its for drone’s Tx
It need 6 AA 1.5V