What is better? 2x18650 series or parallel?

Flashlight Modding and DIY Parts
1

Hi again!:wink:

I am building a new single xml2 u3 diving light.

I need your advice on the batteries setup (+driver).

What is better ? (Or more efficient…though)

  1. Using 2x18650 in parallel with 7135x10 driver?
    OR
  2. Using 2x18650 in series with Buck driver?

Thanks for your time!

2

What is better ? (Or more efficient…though)
2. Using 2×18650 in series with Buck driver

3

Thanks for your answer!
Is there any 3.4a - 3.6a buck driver on the market?

Or maybe, is there any way to mod a driver I already have to be a 3.5a

http://www.ledsupermall.com/cree-xml-t6-8-4v-12v-3a-3-mode-circuit-board-suit-for-cree-xml-t6-led-emitter.html

I still didnt check its’ real current, but I dont beleive it is 3A anyway…

4

Might try one of these. LED TOP LAWYERS

5

I’d recommend LD-29. I used in caving headlamp. It’s PWM free and provides 150, 1000 and 2600ma (measured). I got it from intl-outdoor.com
Fasttech also has driver with same name and looking very similar.

6

Guys thanks for the fast answers.

About ld29 driver, the resistor at the Black cable (R02…) is that a current sense resistor?
Can it be changed into something else to get 3.5A?

Thanks for your time!