Tagged Questions
1
vote
1answer
47 views
How to calculate battery capacity required for home applications?
The issue I'm facing is calculating current draw from different household items. Like, if a fan is rated at 75 Watts, its current draw would be A = W/V so A = 75/220 and A = .34 amperes.
That doesn't ...
2
votes
1answer
148 views
Rechargeable battery calculation
The rechargeable battery info: 1900 mAH (1 battery)
A device that have input of 3V DC and output of 5 V / 500mA
If one rechargeable battery is inserted into the device,
I can expect that it can ...
2
votes
1answer
89 views
LSD NiMH cells that provide reasonable capacity even in subfreezing temperatures
Sanyo claims that 2000 mAh Eneloop LSD AA NiMH batteries provide about 1400 mAh at -10 °C (-15 °F).
I wonder if only Eneloops provide reasonable capacity in the cold, or if the competition does too. ...
2
votes
3answers
171 views
Why battery specs are given in contextless mA·h instead of meaningful W·h? [duplicate]
Possible Duplicate:
Why are deep cycle batteries rated in amp hours instead of watts hours?
I don't understand why it is so common for specifications of battery capacity to be given in ...
5
votes
1answer
98 views
Issues ascertaining current x time for battery life
It is simple to calculate a continuously-on device's theoretical battery life based on the battery datasheet capacity (assuming always nominal voltage, etc.)
An LED @ 20mA..
...
2
votes
1answer
451 views
Battery charging questions Parallel charging and battery balancing of LiPos
I'm having a long discussion on an RC board regarding LiPo parallel charging.
The basic crux is that my understanding of how charging works is something like this:
Charger Line voltage of x(8.4v in ...
4
votes
2answers
239 views
Properly charging and discharging Lithium cells during battery testing?
I'm working on some software that automates charging and discharging battery cells to generate discharge curves. I have a few concerns about properly charging and discharging of lithium-ion / ...
4
votes
4answers
4k views
How do I find the maximum “discharge C rating” of a battery?
I've been experimenting running my 3A LED strips off battery power and the results are disappointing. I'm only getting a few minutes (< 10) out of a YSD-168 1800mAh lithium ion. How can I find the ...
2
votes
3answers
166 views
How to I determine/ interpret values of autoranging multimter
I have an autoranging multimeter and many AA batteries.... how do I interpret the readings when deciding to keep or discard AA (1.5 volt) batteries?
