I have this RF remote/receiver. Though the manual says battery life for the receiver is at least 12 months, I easily get 2 years of operation on a fresh set of batteries. The receiver 4 uses AAA batteries, so that should be 6V at 1200 mAh. Assuming there are external factors like self-discharging, the battery life is further decreased by 15%. I'm basing my calculations from this calculator.

Battery Life in years = Battery Capacity in mAh / Current in mAh / 24 / 365 * (1 -.85)

So based upon a 2 year life span (and assuming the .15 constant is correct) is it fair assume that the receiver is drawing on average around 58uA?

I realize I'm making some assumptions here, like the .15 constant. And I'm fairly sure the receiver is operating in sleep mode and waking up, but I want to make sure I understand this before addressing those assumptions.

  • \$\begingroup\$ Seems like a good estimate. If you need to know for sure, measure it. \$\endgroup\$
    – mkeith
    Dec 27 '16 at 7:03
  • \$\begingroup\$ could be hard to measure if you don't have a data logger. \$\endgroup\$
    – Jasen
    Dec 27 '16 at 8:04
  • 1
    \$\begingroup\$ In the manual it says the receiver operates on AA batteries.Note that batteries have a voltage-mAh discharge curve,which means that as you consume the battery energy,their total voltage drops.The linked document says that the receiver must be supplied with at least 5.3V.Have you considered this? \$\endgroup\$ Dec 31 '16 at 13:24
  • \$\begingroup\$ You have a mistake: "Current in mAh", unit of current is mA, not mAh \$\endgroup\$ Feb 2 '17 at 14:50

IMHO you are doing it wrong. your calculations are only correct if the RF remote is constantly working and sending signals. And I think the 12 months is estimated by the manufacturer for an average household usage of the product.

  • 1
    \$\begingroup\$ OP's calculation of 58 uA avg. is still correct when his personal use pattern of the remote control is the consideration, because a few bursts of high current consumption and long period of no current consumption is still equivalent to a very low constant current consumption on average. So the result can be described as entirely correct. Nevertheless, I agree that it's probably a bit misleading: If the remote is used more frequently by someone else, the calculated average current consumption should also increase. \$\endgroup\$ Nov 3 '20 at 19:37

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.