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Thread: Xtar FC2 Charger Review ( completed - for now )

  1. #1
    Flashaholic* old4570's Avatar
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    Default Xtar FC2 Charger Review ( completed - for now )






    Xtar FC2 Charger - Made available for review by Xtar
    A) Uses USB input ( 5v 2A needed )
    B) Can charge one battery at 2A or two batteries at the lower 1A and 0.5A settings . ( dependent on USB power supply )
    C) Starts charging at constant current till ( at or close to ) 4.2 volts it switches to constant voltage ( 4.2v ) and begins to drop the charge rate .
    D) LED's flashing indicate the battery is being charged - when they all go solid the battery is charged .

    The build quality on the FC2 looks to be excellent and the sliders are put together to a very high standard . The sliders slide flawlessly and just feel really nice compared to chargers made 10 or 15 years ago ( They still be out there ) . I have only charged a few batteries so far but !
    A) The batteries are coming off the charger at room temperature ( 0.5A charge rate )
    B) It does look like the batteries are terminating at 4.2v and depending on their quality and age will determine final resting voltage .

    There will be more to this review ( updated ) , after I charge more batteries . ( Just wanted to put something out there )

    AA Update !
    I spent the entire day ( April 20 ) charging AA batteries and some AAA . I have some dedicated AA chargers and they are brutal on the AA batteries , by that I mean the AA can come off the charger seriously hot . Heat is bad , and these dedicated AA chargers are just killing weaker AA . I am talking about charging at the lower charge rate of 500mAh .
    Xtar FC2 - They were coming off at 5 to 10 deg C above ambient room temperature @ the 500mAh charge rate . Temperature would be related to how good a condition the battery is in . Batteries in poor condition got to 10 deg C above ambient and batteries in good condition got about 5 deg C above ambient . I even charged AA that were down to 0.7 volts . At this low voltage the charger did trickle charge to start with . I did check from time to time ( voltage ) and at around 1.2v the FC2 was still trickle charging . I was in a little bit of a rush to get through 20 or so AA so at 1.2v I restarted the charge cycle . I had two bad AA and a bad AAA and all were brought back . I still have another 20 to 30 AA / AAA needing charging , but they can wait .
    So in regard to the AA , I really like the way the FC2 charger does it's job and does not cook the AA batteries when charging . ( I really like that ) That was one of my pet hates for the over priced dedicated AA chargers ( cooking batteries ) . Kudos to Xtar here !



    Time to play with some 16340 . Starting a 16340 which is at 2.4 volts . I did hope it would trickle charge , but looks like the battery voltage went straight up .

    AAAAAaaaaargh ! ( I'm all batteried out )


    No seriously , testing the FC2 set off the great battery purge of 2021 ! Not just Li-ion and Nimh but also by Lipo collection . ( I fly RC after all ) . So where are we ? Quite a few 16340 have been purged , almost all of my 14500 , some Lipo and AA/AAA . Simply getting to be too old with many if not most being over 10 years old . I found the FC2 to be a great help here . Li-ion that wont charge much past 4 volts or even reach 4 volts have been purged . Honestly I only reach for a few lights these days ( about 5 ) and the days of having 20 flashlights ready to rock N stroll is a thing of the past . Just having fresh batteries to swap into a light does the job . And those batteries need a good reliable charger .


    A) FC2 did not overcharge any battery
    B) I charged mostly older batteries - Li-ion / AA / AAA
    C) I really liked that the FC2 did not cook batteries - I really liked that .
    D) It is a true 2 channel charger - I did a AA on one side and a 18650 on the other without issue
    E) So far I have only seen TC ( Trickle Charge ) with the low voltage AA and AAA , haven't been able to get it into this mode with a Li-ion .
    F) At 500mAh , even 18650 don't take that long to charge . Must be that Constant Current state .

    I really do like the FC2 , it's USB powered so makes for a great mobile ( Car - Truck - Camper) charger . Because it's 5v USB , I guess a decent solar set up will work with it as well if you need a camping charger . These days I am no longer into fast charging , I'm more into slow charging and as such I would happily trade the 2A charge rate for 200 or 250 mAh . I have made a small harness for charging 1s lipo batteries ( RC ) for these chargers . And to charge small RC hobby batteries I like lower current . ( Even 150mAh would be crazy good )
    Different strokes for different folks . I like the FC2 and will be using it as much as possible as I still have a huge number of batteries to get through . And as a tool for assessing batteries ( oh and charging them ) the FC2 is doing a great job . Now if I have to give the FC2 a score , then as far as the FC2 doing what it's meant to do , it's 10/10 . For my own personal expectations for a charger ( What I want ) it's 9/10 . Bottom line , does the FC2 meet your expectations ? If it does then maybe you should buy one because Xtar makes serious kit .
    Last edited by old4570; 04-23-2021 at 04:51 AM. Reason: Updated

  2. #2

    Default Re: Xtar FC2 Charger Review / Preview

    Thanks for your kind update!

  3. #3

    Default Re: Xtar FC2 Charger Review / Preview

    What is TC/CC/CV three stage charging process? What TC stands for?

  4. #4
    Flashaholic* old4570's Avatar
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    Default Re: Xtar FC2 Charger Review / Preview

    Quote Originally Posted by NiOOH View Post
    What is TC/CC/CV three stage charging process? What TC stands for?
    • TC phase: cells discharged below 2.9V are "woken up" by a lower current.
    • CC phase: after reaching 2.9V, the cell is charged with 0.5A DC.
    • CV phase: when the cell is almost charged, the charger switches to charging with decreasing current until it reaches 4.2V on the cell. After reaching 4.2V, the charging process is completed - the battery is fully charged.

    Normal circumstance = Constant current and increasing voltage / followed by Constant Voltage and decreasing current . =/
    http://www.premiumestore.com/08-technology/p-001-1ef73.html?id=33 / Better description ..
    Last edited by old4570; 04-19-2021 at 07:45 AM.

  5. #5
    Flashaholic* old4570's Avatar
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    Default Re: Xtar FC2 Charger Review / Preview

    AA Update !
    I spent the entire day ( April 20 ) charging AA batteries and some AAA . I have some dedicated AA chargers and they are brutal on the AA batteries , by that I mean the AA can come off the charger seriously hot . Heat is bad , and these dedicated AA chargers are just killing weaker AA . I am talking about charging at the lower charge rate of 500mAh .
    Xtar FC2 - They were coming off at 5 to 10 deg C above ambient room temperature @ the 500mAh charge rate . Temperature would be related to how good a condition the battery is in . Batteries in poor condition got to 10 deg C above ambient and batteries in good condition got about 5 deg C above ambient . I even charged AA that were down to 0.7 volts . At this low voltage the charger did trickle charge to start with . I did check from time to time ( voltage ) and at around 1.2v the FC2 was still trickle charging . I was in a little bit of a rush to get through 20 or so AA so at 1.2v I restarted the charge cycle . I had two bad AA and a bad AAA and all were brought back . I still have another 20 to 30 AA / AAA needing charging , but they can wait .
    So in regard to the AA , I really like the way the FC2 charger does it's job and does not cook the AA batteries when charging . ( I really like that ) That was one of my pet hates for the over priced dedicated AA chargers ( cooking batteries ) . Kudos to Xtar here !

  6. #6
    Flashaholic* old4570's Avatar
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    Default Re: Xtar FC2 Charger Review / Preview


  7. #7
    Flashaholic* old4570's Avatar
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    Default Re: Xtar FC2 Charger Review / Preview

    Done for now !

    So many - batteries !

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