I purchased 3 of the Ultrafire 18650 3000mah protected. They worked first time but after charge they showed 4.2v but voltage dropped under 1a load to under a volt. I replaced with 18650 2400mah protected with no problems. I also got 4 14500 900mah protected and 1 did the same thing. Has anyone had this problem or is my bad luck or worse user error.
High failure rate of Shurefire & Ultrafire
- Thread starter aintwaven
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My Ultrafire 18650 protected's are 2500 mah.
I've been using them daily for about 4 months.
I don't check the voltage,but I use them on a copper mod with RCA connectors and always run dual 901 atty's
In this configuration one battery lasts me 2 full days of heavy vaping
and is still pumping the vapor when I switch them at the end of the second day.I have 6 of them so I switch them out every two days.
I've been using them daily for about 4 months.
I don't check the voltage,but I use them on a copper mod with RCA connectors and always run dual 901 atty's
In this configuration one battery lasts me 2 full days of heavy vaping
and is still pumping the vapor when I switch them at the end of the second day.I have 6 of them so I switch them out every two days.
My UltraFire 14500's are spotty but my TrustFire 14500's with the flames are very reliable. Not sure what the main difference is but I would assume a better protection circuit.
Would you mind taking one of those apart and uploading a picture of the PCB? Because what you describe is exactly what would happen if the PCB wasn't present, or didn't actually protect against undervoltage. I've been thinking those "protected" Ultrafires are only protecting against shorts, and not undervoltage.
--Dave
--Dave
Been useing 4 ultra fire 14500 3.6v 900mah for over a month chargeing them in a ultra fire 3.7v charger every outher day with no problums.
I ordered some awhile back-one was DOA when I got it-they claim they'll replace it, so just gotta wait awhile I guess. (14500 900mah that is)
Without being able to see part numbers, all I can tell for certain is that it isn't the same as one I pulled off one of my Trustfire 14500's. Mine has another resistor and a completely different layout. Somebody would need to hook a PCB from a cell that failed to a good adjustable bench supply and see if the undervoltage protection worked properly.Here's a Ultrafire 14500 PCB that went bad after 2 charges.
--Dave
I've had the exact opposite experience. Gray Ultrafire 14500 900mAh are super consistent. The blue Trustfire 14500's are the one's I have problems with.
I got both. The Trustfire were too long to work in NicoStick.
The Ultra Fire fit fine & have used them 1/2 months. No problems wiyh them.
The Ultra Fire fit fine & have used them 1/2 months. No problems wiyh them.
I'm having a problem with the cr2's. Some of them dump awful fast, and below the cutoff. They are real cr@p.
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