Actually, the items sold before that is safe to use with WUBEN original battery. As for the square spot, we update it from the market feedback. Some like that while many are dislike.
That's why we upgrate.
For why we do not contact buyers that has bought the first batch. Well, Amazon has hide every contact info of the buyers. We don't know how to get in touch one by one.
And that is why I comment back in the thread: Wuben C3 flashlight: built-in charging overcharges?! and ask to PM me a order number for after sales service as well as in this thread.