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I am trying to figure out what configuration of battery(ies) I need to power this LED. I am only using one (specifically the warm white 1-up).

I am also looking to make it flicker like a candle with the smallest item possible that will NOT reset every time it is turned on/off. I need to to always turn on and flicker correctly. EDIT/ADD: Is there a resister I can include in a simple circuit with a battery pack to make it flicker? It seems like thats what a lot of the cheap tea lights use.

For context I am trying to make super bright LED candles. So everything I use needs to be able to fit into a smallish pillar candle (~1.5-2.5" diameter x min 6" height). And I am on a pretty tight budget, so please let me know what are the cheapest options.

Thanks!

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closed as too broad by JYelton, RoyC, Voltage Spike, Finbarr, Bimpelrekkie Jun 17 at 6:11

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ What do you mean by "not reset when every time it is turned off". Reset what? The thing you describe has no memory to forget anything when turned off. \$\endgroup\$ – DKNguyen May 21 at 20:12
  • \$\begingroup\$ I have used string lights and other things before that have multiple modes and it resets back to the beginning of the mode options every time it is turned on. \$\endgroup\$ – Nova May 21 at 20:17
  • \$\begingroup\$ Those are simple, stupid LEDs. No worries about resetting a controller. Just about supplying the current. Maximum brightnes (1.5 ampere) is a lot for a battery if you want it to last for a while. \$\endgroup\$ – JRE May 21 at 20:22
  • \$\begingroup\$ Lasting even 1-2 hours would be great. \$\endgroup\$ – Nova May 21 at 20:51
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That's a high quality LED (if genuine) - depending on volume then an Asian sourced semi-equivalent would be much cheaper.

Battery life is very very dependant on operating current.
For a battery of adequate voltage across the operating time

  • Operating life = Battery_mAh_capacity / LED-mA.

If you operate the LED at 700 mA then

  • 3 x AA Alkaline cells with a capacity of ABOUT 3000 mAh would ooerate the LED for about
    time = battery_mAh/LED_mAh = 3000/700 = 4+ hours.

  • A rechargeable 18650 LiIon cell of 3000 mAh would provide similar operating time.

If "cheating" is acceptable, using an existing (low cost) low power flickering-candle-LED to drive your power LED, similar to this circuit by the great Dave Johnson, or a simple but elegantish version here.

Alternatives could be a low cost microcontroller (from about 20 cents US) - ATtiny85 example here and ATtiny13 version here or a counter IC connected to form a pseudo-random number generator.

Many ideas here - Google image search on - candle flicker circuit

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  • \$\begingroup\$ So I could I use 4 x AA alkaline batteries (just to get a battery holder that will fit in my candle)? \$\endgroup\$ – Nova May 21 at 22:40
  • \$\begingroup\$ @Nova You will need a means of regulating the supply to suit the LED and any circuitry. 3 x AA = about 3.3V - 4.5V flat to new. 4 x AA = 4.4V - 6V . You will get NO MORE lifetime with a linear regulator from 4 cells than you get from 3. With a switchmode regulator you get SLIGHTLY more. You still need to decide on a Flicker-circuit. You can use a 4 x AA holder with 3 x AA by soldering a wire across one of the positions - be SURE that a cell never gets inserted in that position. \$\endgroup\$ – Russell McMahon May 22 at 11:46

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