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  1. R

    BMS - Battery Management System (Technical) 14s8p 52 volt 25amp

    I had similar 'imbalance' issues from a heavily used (>450 Cycles) 13S3P 48V battery. After charging, I had only about 1/4 the capacity of the 7.8Ahr pack before the BMS shut down the pack! My teardown discovered one 3cell group had 3.0V while all the others were above 4.0V. The 3 'suspect'...
  2. R

    kWeld - "Next level" DIY battery spot welder

    I welded 0.12mm thick nickel strips to Samsung 18650 2Ahr 20A batteries with the following parameters: 30 Joule Setting 18 mS pulse typical duration 1252 Amps typical current 1.0 mOhm typical Resistance I bought this battery four years ago because of the claim of Deep Charge and High Starting...
  3. R

    kWeld - "Next level" DIY battery spot welder

    I received the kWeld kit last week from Germany and am delighted with the: prompt delivery, excellent build quality and consistent weld performance. The first application was for replacing the five 18650 batteries in an M18 Power Tool pack. The only improvement that I recommend is to Label and...
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