"Panasonic NCR18650A 3100mAh - Q&A

5 posts / 0 new
Last post
dschae1
Offline
Last seen: 2 months 3 weeks ago
Joined: 03/22/2014 - 15:53
Posts: 24
Location: N. Texas
"Panasonic NCR18650A 3100mAh - Q&A

I bought these batteries and they arrived today. I have a few questions for the experts if you don’t mind.
Panasonic Protected NCR18650A Rechargeable 3100mAh 3.7V 18650

Q1) Should I charge them before I use them?…or drain them down some before charging?

Q2) There is a plastic wrap around each battery, but not on the ends. Should I remove the wrap? I think it is just to protect them for shipment, but really, I’m not sure. Does anyone know about removing this?

Q3) I noticed they are a little (3mm?) taller than my first battery [one of these: EFest JV-00500. I guess the 18650 specification is not a precise spec for size and shape?

Helios-
Helios-'s picture
Offline
Last seen: 3 years 2 months ago
Joined: 01/18/2012 - 21:12
Posts: 2099

Do not remove the clear wrap. It holds the protection circuit on the bottom.

New batteries should arrive only partially charged. I would charge them. You can use them now / partially charged, no harm, you just won’t get full runtime. No need to fully discharge li-ions before recharging. Charge them at any time.

These batteries are protected. The protection circuit is added to the bottom & adds a couple millimeters. Anatomy of a protected battery


Counterfeit 18650s, 2,<a href=“http://

phantom23
phantom23's picture
Offline
Last seen: 5 hours 26 min ago
Joined: 09/26/2011 - 17:39
Posts: 962

1. If you don’t have a multimeter you may discharge them a little before charging.
2. Clear wrap is something like isolator for ptotection circuit.
3. Cells inside are 65mm tall but protection circuit adds a few mms. Efest cell you linked doesn’t have one, that’s why it’s shorter.

kronological
kronological's picture
Offline
Last seen: 5 years 1 month ago
Joined: 12/12/2012 - 09:23
Posts: 3042
Location: Texas

dschae1 wrote:
Q3) I noticed they are a little (3mm?) taller than my first battery [one of these: EFest JV-00500. I guess the 18650 specification is not a precise spec for size and shape?

They are a little taller because of the protection circuit…so yeah…they tend to vary in length a few mm.

No one, after lighting a lamp, puts it away in a cellar nor under a basket, but on the lampstand, so that those who enter may see the light.

My Reviews: Ma

Helios-
Helios-'s picture
Offline
Last seen: 3 years 2 months ago
Joined: 01/18/2012 - 21:12
Posts: 2099

The EFest JV-00500 that you linked are actually a different chemistry. LiMn also known as IMR, its a bit safer then li-ions so they don’t usually have protection circuits added.

Be aware that they do sell li-ions without protection but don’t buy them. The battery manufacturers say a protection circuit is required for li-ion.


Counterfeit 18650s, 2,<a href=“http://