New Miboxer C4-12: "Upgrade C4-12"

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BlueSwordM's picture
Last seen: 1 hour 21 min ago
Joined: 11/29/2017 - 12:34
Posts: 6551
Location: Canada

Same thing with the C4-12 V1.

Not a bad thing, but the automatic charger is not very conservative in terms of charge rate.

However, it’s been wonderful as a charger, so I would recommend it to most members here with a manual charge rate.

My very own high current Beryllium Copper springs Gen 3:
Liitokala Aliexpress Stores Battery Fraud:

hasddie293's picture
Last seen: 7 months 3 days ago
Joined: 03/05/2019 - 08:53
Posts: 334
Location: Brunei

I have this Version 2 C4-12, I let it automatically charge my Vapcell INR21700 4500mah 20A RED…first it start low current and for while it increase current. I noted that it goes Max current which is 3Amps, that when I see temperature reach 40 celcius… Before, my thought is that charger than can determine battery chemistry, Internal ohm and auto select current accordingly should be safe for the battery condition and life cycle.

I’m doubt about the battery condition when it reach 40 celcius. I know 60 celcius is limit for baterry life cycle. The charger charge fine though as ussual terminated at 4.20v, trickle down current fine, no big issues actually here just saying…

Next time charge I should charge manually, my question is how much current should I set for my newly Vapcell baterry?? 2.5a? just 2a? I was try not to reach 40 celcius, it safe though but I want just way below that threshold.

Or should I leave it automatically incase I am wrong here..hehe. I’m just getting skeptical on battery..funny.. Big Smile

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Sidney Stratton
Sidney Stratton's picture
Last seen: 2 months 3 weeks ago
Joined: 01/28/2018 - 22:59
Posts: 1076
Location: Canada

As a postscript to my earlier observation (post #54), I’ll be manually setting the charge rate. Best guess depending on cell – low side to extend battery life.

Last seen: 4 months 3 weeks ago
Joined: 10/23/2019 - 11:58
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Location: Poland

Mishanchik wrote:
Interestingly, fixed MiBoxer problem 3 slots in the Upgrade C4-12?

Old C4-12 – problem (reviews from BLF)
C4-Plus – problem (reviews from Aliexpress)
C4S – problem (reviews from BLF)

I want to understand – did the MiBoxer engineers work on the bugs, or their problem of the updated C4 series was transferred to Uprgade C4-12 also.
Apparently the quality of products is affected by the fact that it is produced in very small batches.


I can confirm that faulty port #3 looks like faulty port #2 now, like in this video Also saw user D T A posted information here

I am a victim of this too (same symptoms, 12V on slot #2 when empty, Err message). Three confirmed faults in above link, add 2 of my friends who bought this device from different seller on AliExpress with same problem. This is mine×8g