I'm having problem with the mod. Whenever the battery is 50% (or lower) the Voltage output drops significantly. 3.89V when fully charged compare to 3.19V when low battery. I use it with Uwell Crown Tank and 0.5ohm coil. Anyone having this problem? Or I have to keep 3 or 4 batteries in order to replace frequently? :-<
P/s: the battery is Samsung 25R 18650 2500mah. :-<
https://online.aspirecig.com/aspire-18650-battery40a1800mah-p-107.html
The Samsung INR 18650-25R is a great battery, but not for high current draws. A review of this battery can be found here.
I use them singly with the 1.8Ω coil in the Kamry 30W V2, and now the Pegasus V2. For higher power vaping, up to 50W I'll use two of them in my Sigelei 150W, or Smok X-Cube II. They last all day when used like this.
For more vaping power, you need a battery capable of delivering higher current. The go-to battery for many high power vapers is Aspire's 18650 Battery 40A 1800mAh. The initial poor reviews were due to misunderstandings by the reviewers. Mooch, the acknowledged king of battery reviews rates it as the equal of Sony's VTC4. Here's his review.