My friend just received two Samsung INR18650-25R. I've told him to send them back, but maybe someone can shed some light on the subject. I've never seen batteries like these. Looks like they just pulled them from a battery pack.
Edit: Apparently this was a mistake on my friends part. As an Australian buying from a Korean website (Hangul) he accidentally selected spot welded batteries. Not the vendors fault. I'm just not sure for what application you would use spot welded batteries.
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