# COMMUNITY : FORUMS : TECH

## Battery Powered LED Strip

Hi,

I have one 6V Alkaline Battery (or two 3V Coin cell battery) that i am using to light a fairy LED strip (see here). I'd like to know for how long the battery will last me for. Can you please direct me what parameters I need to collect for the battery (or the LEDs) and what equations i will be using to determine the operating time of the battery. Thank you for your support in advance,

Regards,

Antzy Carmasaic2 years ago

Assuming the batteries are in series(most common setup):
2 CR2032 batteries in series = 3V * 2 = 6V
Wikipedia says typical capacity is 225mAh. In series, capacity remains the same for 2.

They run for 10 hours.
So current consumption per hour of lights = 225mAh / 10h = 22.5mA

So if the new batteries can provide 6V, look up their current capacity. Let's say it is X mAh. So they will run for (X / 22.5) hours.

Greensal (author) 2 years ago

i was aware of this information but if i am to use different set of batteries wouldnt that be different?

mpilchfamily2 years ago

Nothing to calculate here. The lights take 2 coin cell batteries and it tells you right there on the Amazon page that they will run for over 10 hours on a set of batteries.

http://www.amazon.com/Lights-Battery-Sets-10-light...