MiBoxer C4 Smart Charger Review
We will be reviewing the Miboxer C4 smart charger this charger was sent to me by Miboxer they actually sent me two which is good. I have had one charger plugged into the wall for over a week straight! I have ran so many different cells through this charger in the 2 weeks I have had it. It has already had a very hard life. I have pulled one apart to check it out and left in tact for photos.
Internal resistance test with trustfire 14500 reads 95 milliohms! sorry for the blurry pic!
- Safety (I will do my best)
- Build quality
What category should I start with?
Features & Functionality
The Miboxer is jam packed with a whole variety of features it has all the goodies you would want in a smart charger. Plus extras when I was looking at the C4 smart charger I was thinking it was another plain and generic smart charger with normal features. When I received the C4 I was pleasantly surprised to see all the features the C4 offers. First of the bat I prefer chargers that have an inbuilt mains rectifier. Basically this mean instead of using an AC-DC adapter you can plug mains straights in the Miboxer. The C4 has that ability to use straight mains AC power 90-260V input voltage. No need for big and heavy adapters they are a pain. I can see two sides to this. Having an AC-DC adapter will take away some of the heat from the charger its self. Not a big issue seeing as those adapters are all passively cooled. The C4 is set up in such a way that the heat will be evenly spread throughout the charger. The Miboxer C4 stays relatively cool even charg8ing 4 cells at 800Ma. I will go further into this in the build quality section. I love opening a charger package and picking up a figure 8 cable that I can actually use. I have never received an Australian mains figure 8 cable with any charger but Miboxer sent me two. The Miboxer C4 does feature a 12v DC input this would be used mainly for some thing like an in car charger.
So as you can see it does all of our commonly used cells for flashlights and vaping plus lots more. We are seeing smaller cells becoming more common with flashlights like the CooYoo Quantum but those 10180 are to small to charger in the C4. This is to be expected they are really small cells.
I personally feel that the max charge rate for NiMH is way to low there is no reason at all that AA NiMH can not be charged at 1amp. Looking further into this I can see why they limited the input current because the pulse is phase is twice as much at 600ma.
Charging cells on the low setting will yield a max charging rate of 350Ma for lithium cells and a max charging rate of 150Ma for NiMH/NiCd. Although the 150Ma is a little low even for AAA cells. I would have liked to see this option in the Lithium department so you can charge smaller cells like 10440 at a proper rate.
When you first insert a cell it reads the voltage correct 4.17 on my multimeter and the charging display. Either way this happens on most of my chargers. I ran this test a few times and got different results. I had cells reading 1.5 volts on screen and once checked while in the charger they read 1.5 volts. This does not effect the cut of voltage of the C4 which is important. The cutoff voltages are all spot on!
For lithium cells the cut of voltage for lithium is either 4.20 or 4.35 (if selected in the menu). Here the C4 does very well cutting of voltage at exactly 4.198 volts. Spot on I would say! If you want the C4 to charger your cells to 4.35 volts or charge your Lipo cells you have to select that in the settings. For lithium cells standard cut of is 4.20 volts. This cut of voltage is well within the Miboxer specs.
For NiMH and Nicd Miboxer rate the cut of voltage at 1.48 volts with a plus or minus of 1% my cells where terminating around 1.50 volts not rested well within specs.
All the 4 charging ports are separately controlled so you can charge all your different cells at once. This feature is common on smart chargers but of you have a basic lithium or NiMh charger it may not have separate current and voltage control. Also keep in mind some charger let you have no control over the charging rate.
This is great feature to have on a charger and is defiantly an optional extra that Miboxer decided to include. On high mode the C4 will discharge the cell being tested at 400ma. On low mode the C4 will discharge the cell at 200ma the charging rates stay the same so for lithiumís high will be 800ma and low will be 350ma charge rate. As with most capacity testing charger the C4 will first fill your cell up then fully discharge to 3V then charge the cell up again. The capicity and resistance checker work with both NiMH and lithium based cells.
All my cells came up close to the rated specs the charger performs the same as the liitokala lii 500. My Samsung 25r came in at 2550Mah which is very good they are rated at 2500. This charger does a good enough job to give you a ball park figure.
- Compatible with batteries of Li-ion (4.2v / 4.35v), LiFePO4 (3.6v), Ni-MH/ Ni-Cd (1.48v)
- Compatible with all diﬀerent type of cylindrical rechargeable lithium battery
- Up to 800mA charging speed in a single slot
- High precision Calibration of voltage source
- Automatically stops charging upon charging completion
- Reverse polarity protection and short circuit prevention
- Automatically detects battery power status and displays charging progress
- Automatically detects Battery Resistance Detect battery capacity in discharge
- Each battery slot controls and charges independently
- Support small capacity battery charging
- Support for lithium battery repair function
- Compatible with DC12V Car Charging function
- Made of ﬁre resistant, ﬂame retardant PC material Designed by optimal heat dissipation Excellent circuit design, 3 years warranty
The Miboxer C4 is a very well build charger it punches above its weight in this category. I like the internal board lay out I will attach photos here so you can see for your self. All the soldering is good and I like the fact the mains voltage is serrated from the rest of the board. There is also good separation between the AC input and DC output it looks to be about 7mm separation. All the traces are big and have good clearance. The board layout on the C4 is impressive even if I only half know what I am looking at. It looks like a lot of thought went into safety. They do mention that the charger is lighting resistant I am not sure about that. If I had an insulation tester I would love to test the Miboxer C4. Hopefully some one else with skill can confirm the board quality.
Back side battery PCBThe Miboxer C4 also incorporates build in safety features for charging and discharging cells. Features like short circuit protection and reverse polarity protection. Which is awesome in case you insert cells the wrong way around. The C4 also automatically stops charging once the cell is full. The C4 automatically detects battery types so you will never over charge NiMH or under charger your Lithium cells. The body of the Miboxer C4 is very sturdy and is made of ﬁre resistant, ﬂame retardant PC material Designed by optimal heat dissipation. The springs are well connected to the charger and do not flop about when you take the charger apart. They appear to be stainless steel and are none magnetized. The negative terminal move easily and offer ample resistance they are not overly high sprung this should mean no more cells flying across the room. The buttons on the front feel tactical and offer good feedback. All the PCBs used on the C4 are custom made and have Miboxers name on them. This shows pride in there product. The Miboxer C4 also has a bleed resistor so when you open the charger it is already discharged. All of the ports and inputs feel solid and well made and do not jiggle or wiggle. The main safety issue with most charger would have to be overcharging and I am glad to say the C4 performs perfect. The other issue is to high current and here the Miboxer C8 does perfect. You know your cells are in safe hands.
Charging 4 cells at once the Miboxer C4 does get warm but not hot using my thermocouple the ambient temperate is 23 degrees. Placing the C4 on a table I saw a max temp of 44 degrees with the thermocouple under the Miboxer C4.
The Miboxer C4 offers so many different features and options its a hard charger to beat. The inbuilt multiple input voltage is great plus they give you the option to use straight DC for car charging. The UI is very simple and easy to navigate. You only have two buttons and a few option all the rest is automatic. The C4 can charge all the cells that are commonly used. The charging current options make this charger friendly for all of us. The charging options also means most if not all cells can be charged on the C4. The back lite LCD is super bright and very easy to read and understand. If you do not like the back lighting you can turn it of. Not one aspect has been over looked with the Miboxer C4. Plus Miboxer give you a 3 year warranty which is a great piece of mind. Cell placement in the C4 is very good! There is enough space to fit all your cells you can even charger 2 26650 at once I have 26650 that will not fit of my other chargers but they just fit inside the C4 I managed to get in 2 26650 plus 2 18650s cells to charge at once this is awesome. Max cell lengh is 72mm which is big. The overall dimesion of the Miboxer C4 are 10.3cm across (horizontal) and 15.8cm in length (vertical) and 3.8cm in thickness.
Max charge current for NiMH is 300ma but it is reading almost 600ma this could be the pulse charging at work?What is included withe MiBoxer C4?
- Miboxer C4
- AC plug
- AAA adapter
Thanks for taking the time to read my review of the MiBoxer C4 i tested the charger to the best of ability.