I am sorry for my bad English before writting this question
I have got nitecore EA4 recently.
To play with EA4, I use my E-keep AA batteries(this is eneloop type battery. this is known as good battery in Japan,Taiwan brand)
I turned it for one hour for test.
And I found that the rubber switch was popped up like a balloon.
It seemed be exploded soon!
It means the batteries produce gas.
Acutally I had similar experiece when I used ThruNite Neutron series.
Do I need to trash my AA batteries?
Anybody know what is the gas name?
Seems that the flashlight got hot due to your testing and working continuously for one hour.
Another member had a similar problem with the rubber button when he left the EA4 in his car where temperature was quite high.
Fact is that Nitecore has to redesign this rubber button on the EA4.
Besides the fact that heat is obviously affecting it, the led beneath is almost invisible when lit.
Thank you for you guys opinions.
Yes I tailstanded it for one hour…
Compare to Nitecore P25,I thought that EA4’s heat treatment was better to touch.(both are on high mode, EA4 doesnt get hot for one hour. it was just warm.
No. Because I removed tailcap at once when I saw it
Ah you give a idea.
I will not remove tailcap until torch cool down.
Anyways…my old batteries seem be in not good condition.
I can’t charge one battery with sysmax i4 charger after using in EA4
Its voltage is 0.918v
———>the voltage rises to 1.1v next day.I can charger it.
EA4 tortured AA batteries.
I am testing EA4 with akalne batteries now
It has passed 43 minutes since turned on.
rubber cap inflates a little as you see… that is accpetable for now.
It sounds like a heat buildup problem. I wonder what would happen if you pricked a tiny pinhole in the cap? It sound funny, but it is almost as if your EA4 is too waterproof. Heat expands air, and it is not escaping from your torch, which is causing the switch to act as a hot air balloon. The rubber compound chemistry of you cap could also be at fault.
Only time I’ve seen a rubber switch cover bulge is when I ran down a single AA to completely drain an alkaline cell. Towards the end of AA’s life, gases escaped and forced the rubber switch cover up and I had hard time unscrewing tail cap, but when I did the bulge disappeared… foolish to do but I was foolish at the time
Apprarently, a select few of the EA4’s rubber switch covers are of a different composition? Only stretch one way?
Test Results: At 1 hour 30 minutes with regular eneloops, my low battery indicator is flashing fast, but no bulge on the rubber switch boot.. EA4 output has dimmed considerably at 1 hour 35 minutes. At this point I shut the light off
I haven't tested mine too thoroughly in terms of total continuous run time, but have ran it for ~15 minutes repeatedly, without any problems.
The LED is kind of useless while the light is on.
Vs the same size, about almost the same output the EA4 warns up much faster than the fandyfire rook. This could be because the driver is producing more heat, or if the heat dissipation on the ea4 is better. Not sure which.
it is funny this being mentioned as I have had this happen once to me. It was with a Fenix using 2 AA and the tail switch cover got huge. I discontinued use of those batteries and put another set in and never a problem. I felt at the time it was a faulty battery ( rayovac NiMH) and seemed to confirm after changing .