Here is a great deal on a few different batteries. Both are trusted and have been used in the community for years. Solid workhorse batteries. You will save even more money (beyond the coupon) when you buy 2 or more.
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LG HE4 - 2500mAH / 35AMP 18650 BATTERIES - $3.91
USE COUPON CODE VAPECHEAP
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SAMSUNG 25R - 2500mAH / 20A 18650 BATTERIES - $4.26
USE COUPON CODE VAPECHEAP