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Thread: Charger that can measure real battery capacity?

  1. #1

    Question Charger that can measure real battery capacity?

    Hello everyone,

    Iím looking for a charger that can also tells if a battery really ďhasĒ the mA it claims for. Iím not in the search of precise measures just a charger that says if battery is really 3800Mah, for instance.
    Thanking in advance.

  2. #2
    *Flashaholic* Lynx_Arc's Avatar
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    Default Re: Charger that can measure real battery capacity?

    First off you need to decide what battery type/chemistry you wish to charge/check. If the battery you are talking about (3800mah) is an 18650 then the claim is bogus as there is none above 3500mah or in that format I've heard the max is supposedly 3550 but typically 3400mah is the norm for common max capacity of that format.
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  3. #3

    Default Re: Charger that can measure real battery capacity?

    I have a XStar V2 for awhile now. Don't remember what I paid for it but I know it wasn't expensive. Works great, tells me the charging rate and the mah on the battery with the voltage.

  4. #4
    *Flashaholic* idleprocess's Avatar
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    Default Re: Charger that can measure real battery capacity?

    Just keep in mind that any charger measuring Ah can only measure current delivery at its terminals. With some current lost to heat, net Ah realized on discharge will invariably be less.
    Last edited by idleprocess; 10-30-2020 at 07:53 PM.
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  5. #5

    Default Re: Charger that can measure real battery capacity?

    Quote Originally Posted by Lynx_Arc View Post
    First off you need to decide what battery type/chemistry you wish to charge/check. If the battery you are talking about (3800mah) is an 18650 then the claim is bogus as there is none above 3500mah or in that format I've heard the max is supposedly 3550 but typically 3400mah is the norm for common max capacity of that format.

    Iíd like to check li-ion 18650 and 14500.
    Yeah, I know thereís no 3800mah but if I get something close to 3500 itís ok.
    Iím considering the Liitokala Lii500-S charger...

  6. #6

    Default Re: Charger that can measure real battery capacity?

    Quote Originally Posted by 1996alnl2 View Post
    I have a XStar V2 for awhile now. Don't remember what I paid for it but I know it wasn't expensive. Works great, tells me the charging rate and the mah on the battery with the voltage.

    Thank you! Iím considering one too.

  7. #7

    Default Re: Charger that can measure real battery capacity?

    Quote Originally Posted by idleprocess View Post
    Just keep in mind that any charger measuring Ah can only measure current delivery at its terminals. With some current lost to heat, net Ah realized on discharge will invariably be less.

    Thank you for the information.

  8. #8
    *Flashaholic* Lynx_Arc's Avatar
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    Default Re: Charger that can measure real battery capacity?

    Quote Originally Posted by Hegner View Post
    Iíd like to check li-ion 18650 and 14500.
    Yeah, I know thereís no 3800mah but if I get something close to 3500 itís ok.
    Iím considering the Liitokala Lii500-S charger...
    Looks like a decent charger according to reviews. I have a (slightly modded) Opus BTC-100 single cell charger that works fine and for me it is a good all around charger due to it has the option to be powered via micro USB 5VDC input or 12VDC input and also work as a power bank if using lithium ions (which I think the Lii500s can also do).
    For now I rarely need to charge more than 1 battery a day and a many 18650 devices have built in charging.
    I think in the future I will consider a 4 cell charger as I've gravitated to 18650 format as my primary battery type and have worked on replacing my commonly used lights with 18650 variants over the last few years.

    My advice is when you get a new charger don't just slap a battery in it and abandon it and come back half a day later, keep an eye on it till you get through a few charge cycles so you know that the charger isn't defective. I almost never leave a lithium ion charger on if I am going to be gone from the house for over half an hour just a safety precaution.
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  9. #9
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    Default Re: Charger that can measure real battery capacity?

    Be aware that you need a charger that will measure discharge current. A lot of chargers will measure total charging mAh, but that's not an accurate measurement of the battery capacity. You need to measure discharge mAh (from full). A cheap charger that will do that is the Liitokala Li-500.

  10. #10

    Default Re: Charger that can measure real battery capacity?

    Thank you all for the informations! Much appreciated!
    Last edited by Hegner; 11-02-2020 at 07:06 AM.

  11. #11

    Default Re: Charger that can measure real battery capacity?

    Quote Originally Posted by 1996alnl2 View Post
    I have a XStar V2 for awhile now. Don't remember what I paid for it but I know it wasn't expensive. Works great, tells me the charging rate and the mah on the battery with the voltage.
    BTW, do you know if this charger is compatible with RCR123 batteries?

  12. #12
    *Flashaholic* Lynx_Arc's Avatar
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    Default Re: Charger that can measure real battery capacity?

    Quote Originally Posted by Hegner View Post
    BTW, do you know if this charger is compatible with RCR123 batteries?
    I thin Xtar has a website that you should be able to check out their line of chargers. I'm not familiar with the brand myself but think they have several models that cover all sorts of battery types/chemistry/sizes.
    I currently use an Opus BTC-100 single cell charger that can "do it all" and they make a 4 cell charger. There are a lot other brands and models of chargers out there and a lot of charger threads in the forum. Do a search for lithium ion chargers either here or on a search engine and start reading and see what suits you.
    Last edited by Lynx_Arc; 11-02-2020 at 11:14 AM.
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