Battery question for Trustfire TR J12 / Fandyfire STL V6

Batteries and Chargers Rechargeable Batteries
1

Hi

Hope some owners of these 2 flashlights can help me with choosing the right battery (as I am all new to Flashlights and Lithium batteries please bear with me) - I just ordered a Trustfire TR J12 and will also have a Fandyfire STL V6 (respectively its Twin the Skyray STL V2) on order.

I have shortlisted the Panasonic NCR18650B as well as the Sanyo UR18650ZT series batteries as well as the Nitecore Intellicharger i4 V2 - yet what I am uncertain about is what capacity and voltage would be recommended for best performance.

Given that both lights are digitally regulated (the TR at 7500mA and the STL at 3000mA) will my choice of batteries have any relevance for safely operating the Flashlights at their brightest output. Runtime is at this point less important than brightness, yet I expect to operate them for up to 10-15 minutes (at a time) at the highest mode with occasional use of the Strobe (if that makes any difference).

So in practice for these 2 Flashlights which would you recommend:

- Lower capacity or higher capacity batteries ?

- 4.2 Voltage or 4.3 Voltage maximum batteries ?

- Protected or unprotected batteries (and what benefit would protected batteries have in this scenario?)

- Will 26650 batteries be a better/safer choice than 18650 batteries ?

  • Are other brands to be preferred over Panasonic or Sanyo and which ones (cheap Chinese batteries are no option for me) ?

I understand someone suggested using C cells for the TR in a different thread, however I may want to invest in good Lithium batteries also for different Flashlight models in future, so thanks in anticipation for giving me some advice before I toast my 1st flashlight by using the wrong batteries.

Cheers

2

Sorry, this thread is old, but here it goes. It's common practice to use protected cells when they are used in series, like both of these flashlights do. I would only recommend protected cells for you - you could have major problems with unprotected cells when they run down, or go bad. I would stay with the standard 4.2v max rated cells, not the 4.3 ones. 4.3 is non-standard and gets difficult to find a charger for them. In lights like this with cells in series and with the stock drivers, internal resistance of the cells isn't so critical.

I would suggest KeepPower protected cells - 26650's for the J12, 18650's for the 18650 light. They are known quality cells and an excellent protection circuit. There are other good ones around as well. I'd stay away from the Panasonic protected cells FastTech sells - they are proven to fail with the protection circuit.