I'm looking to calculate the battery life in hours with the following setup:

  1. AAA Battery: 1.2v 950mAh
  2. PCB to convert AAA 1.2v to 3.7v
  3. Strip of LEDs. Total 16 leds at .24w each. Total 3.84w at 3.7v

What life would i get from the battery in hours roughly?


  • \$\begingroup\$ Around 5-15 minutes. \$\endgroup\$
    – Tom L.
    Commented Oct 14, 2015 at 6:02
  • \$\begingroup\$ thanks @TomL. Think i better rethink the product then! :) Need a couple of hours at least. \$\endgroup\$
    – jason3w
    Commented Oct 14, 2015 at 6:03

1 Answer 1


3.84 W at 1.2 V is 3.2 A, more than one AAA NiMH battery can muster. This datasheet only shows up to 2 A, and the curve isn't pretty.

Note that at such a high load, it's not a 1.2 V battery at all. Internal resistance is significant, which also means it'll heat up.

enter image description here


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