Thanks! I wonder how the grey wrapper protected Trustfires fare? I have some of those and they seem OK but I never use them long before recharging or push them hard. I guess with Trustfire / Ultrafire you probably never really know what cell you're getting anyways.
I think it's safe to assume that it won't have the capacity listed on the label, but I have no idea about anything else. I wonder if fakes still apply to this battery type. Isn't there far less sources for this type?
i have 2 pairs of 10440 i think, not sure if they’re trustfire or ultrafire though. 1 pair grey protected and 1 pair blue unprotected, or the other way. it looks as if i haven’t tested them with my opus bt-c3100 yet though.
might do it some day and upload my results to this thread if i remember