Fireflies E07 preview

The dent on the top is nothing but that groove is way out of the ordinary.

Just did a google image search of the 40T and none of them show that deep groove. Can not be from the E07 cap either as the spring diameter is not so wide. What it seems is that the 40T I got in my E07 was used and abused in some other device before being shipped to me. I have a strong feeling I should send it off for recycling as the grooves in the bottom are just too deep.

Yes, that is very encouraging. The only issue is Nichia 219B LEDs are discontinued, so there is a trade-off between choosing them or the improved E07 in the future, if you are interested in those emitters.

contactcr, ever see 4K video shot on a full frame sensor? Bring a Rhodes mic and we’ll mod a few… :stuck_out_tongue: (The Rhodes mic isn’t necessary, dual mics on the 5D MkIV work just fine… I’ve just always wanted a Rhodes with a dead kitten)

Wait, what? TK, the center aux LED’s are supposed to be lit over 3.3V? Like, all the time when the cell is charged? Or just down at the low level as an early warning indicator?

Edit: When my E07 blinks out 3.3V there are still no center lights. At 3.2V the red lights are on and the outer purple aux lights are off.

Edit II: At 3.29V (measured on a meter) the center lights are off and the outer lights are on. I don’t ever see a green or blue center, only red and only then for a very short .2V period.

Edit III: At 3.29V I can see the red center lights blinking, but only if I look through the clear side of the center TIR, they don’t show from the front.

No, the inner ring (red LEDs) are only lit during a specific range of low voltages. At higher voltage, only the outer rings light up. There are no green or blue or purple emitters in the center. Also, the exact voltage where it changes seems to vary from one light to the next.

Without knowing the thickness of the bottom plate, it's impossible to know if there is a safety concern or not and based on the images I saw online, none of them have this indention. For lithium batteries, I've always followed the "when in doubt, throw them out" rule. The bottom ring almost looks like a factory fault and someone decided to let it go.

I have cells deeply indented in the base from overly stiff springs, mainly the little carobronze ones from FastTech… been using them that way for years. Deeply indented. Dang near lay a green pea in there….

The battery’s tail groove looks like it was just manufactured that way.

Google tells me this pic is a Lishen 2170SA 4000mAh 21700 cell. Dunno if it’s the same thing, but it has similar specs and the same tail ring:

In any case, it doesn’t seem like the battery is damaged.

It looks like the Samsung 48G also uses the same tail ring design. That’s just how the factory produces it.

Someone should check the length and width (WITH PLASTIC CALIPERS, DO NOT SHORT YOUR BATTERY) and weigh them. Lishen cells are also slightly longer than 40T’s which could explain even more.

Yeah I’ll probably just order a new Samsung 21700 40T and see what happens.

Good to know, thanks!

Hmmm interesting.

EDIT: Just saw your edit with an additional battery.

Klrman,I have two brand new 48Gs that came the same way from Battery Junction. The rings are not a result of being compressed. They are manufactured that way for some reason.

I believe it’s for safer venting?

Weight: 68.53g

width: 21.70mm

length: 70:70

The dimensions basically line up perfectly with a Lishen battery. All of those dimensions are larger than a 40T

Thanks! Seems that some samsungs do have the rings then. Still couldn't find any images of 40T's with rings though.

Can you show the wrapper in full? They do sell a Lishen battery on their site and before we do a witch hunt it DOES say 40T right?

imr has the 40T list as 21.1mm width.

The Aha! moment when the red lights first come on…


And yes, I turned the purple auxiliaries back up, they’re just too magnificent at this level… :smiley:

nah, not a witch hunt for sure, just making sure the battery is ok.

It says samsung on my wrapper