length is spec'ed as 70.5mm but i can hardly believe that. Such cells wouldnt fit in a grand variety of common popular 1x18650 flashlights or multi-18650 flashlights.
Anyway, they exist, and price is good too shipped. Let's recall that Protected Efest 3400 cost ~25 bucks shipped, button top version.
I just got 2 of these from FastTech and they fit in the Sipik sk98 clone (a touch long but you can screw it shut) and they fit nicely in the Aleto 26650 version with the 18650 insert.
If you have other batteries like the Samsung ICR 18650 30A which is full charged with 4,35V - a 4,2V charger is not a problem and will not harm the battery. Of course it's not charged 100% full, but you can read in many thread, that a not 100% full charged battery will have a longer lifetime.
I would like to ask the difference Panasonic Protected and Unprotected batteries.
In protected batteries it had some kind protection for overcharge, over-discharge, etc…
and unprotected didn’t.
So… If I’m charging the protected batteries, it will stop if the batteries FULL. ( Green Light )
what about the unprotected one ? Is it the same ? My charger output DC = 4.2V
I’m gonna used it for some kind ultrafire XML-T6 flashlight is it OK ? After an hour using full brightness it’s very hot.
In a good, reputable charger, the unprotected Panasonic NCR18650B cells shown in the 1st post will also stop at or around 4.2v’s. The protection circuit just cuts out when the voltage gets to low in the cell from usage, not necessarily from charging, or overcharging. I have several of these cells, and they are excellent! Better than most other cells. When using them, you just have to be very disciplined and be on the lookout for the 1st significant dip in output on the drop in, and then stop and recharge immediately. Most good, reputable drop ins have a protection circuit built in that will stop the output of the light when voltage is too low.