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Used battery? Prices, where to buy, testing

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    Used battery? Prices, where to buy, testing

    Looking to upgrade my battery, getting about 15-20 miles out of my existing battery. Started a Topic here:

    Van stolen- need large battery for ebike! - Electricbike.com Ebike Forum
    I just had my sweet van stolen! Pinched it right from my apt complex parking. That leaves me my ebike as sole transportation. Currently I can go 15-20 miles with the battery I’ve got. Being retired on extremely limited income, I don’t have the luxury of simply buying the pricier options, like the Bafang 20.3ah shark style


    I just had my sweet van stolen! That leaves my ebike as my sole transportation. Being retired on extremely limited income, I don’t have the luxury of simply buying the pricier options, like the Bafang 20.3ah shark style.

    Basically I was looking at installing a 20-24ah battery with a Hailong/Shark enclosure and was wondering:
    Which of the cheaper sellers, like UPP, can be trusted?
    It's literally twice as expensive to get a quality battery, and I just don't have the money, esp now that my van has been stolen.

    So the question still stands:
    Where to buy a new, large, quality battery at a reasonable price?
    The one I'm leaning towards is the 'official' Hailong store on EBay:
    $379 for a 52V 19.2ah using Panasonic 21700 cells. The seller, an agent working in the US for Hailong batteries, has responded quickly to my many questions.
    The battery using Panasonic 21700 battery cells weighs at least 6kg or more, and the supported motor power range Within 48V/52V 200W-2000W, if the battery can not support 48V motor 2000W power at most, these 52V 20AH batteries are all fake batteries, and the batteries used inside are not Panasonic 21700 battery cells.

    -------------

    Then it occurred to me:
    What if I got 2 medium sized batteries instead of one huge one?

    Securing a smaller battery is much easier, and I could always just carry the 2d battery in a backpack if I knew I was going for an extended ride. Ideally a 15-17ah and a 12-14ah.

    But this plan only works if I'm buying used batteries
    and saving a shit ton by doing so. My basic budget is $700, which includes $100 for a battery charger that can do 80/90/100% charging at 1-5 amps. So, about
    $600 for the 2 batteries themselves.

    ? Are there sources for used batteries that can be trusted?
    ? How do you even measure a batteries remaining life?


    What do you think!?

    Thanks! Very pleasantly surprised at how engaged and helpful folks are on this forum, and have been educating myself with all the greats posts and knowledge base.

    About my bike:
    - Specialized RockHopper hard tail (probably 10 years old, an $800?, bike originally)
    - BBS02b mid-drive motor, about 2,500 miles on it (I did not do the build-out)
    - 90% streets/commuter, occasionally on gravel/off road
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