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  1. jimbo69ny

    Tesla module charging to full/degradation

    I have been thinking about this for a while now and I haven't read anything about it. This might be a stupid question but I need to know. It is no secret that 18650 cells/Tesla modules degrade with time. I assume that something inside the cars software knows how much degradation is there and...
  2. jimbo69ny

    Need thin, non conductive, fire retardent sheets. Mica?

    Hello, I am looking for thin sheets that are non conductive and fire retardant for my battery box. I've heard and seen that Tesla uses mica sheets in their battery box. I looked up prices on ebay and amazon and the stuff is expensive! Do you have any other recommendations? I need approximately...
  3. jimbo69ny

    18650 questions - How does internal resistance relate to voltage?

    Hello Everyone, I recently picked up a bunch of laptop batteries and I had a few questions. How does internal resistance relate to voltage? Does it? I want to test to see what happens when you put a low resistance cell and a higher resistance cell, in parallel, in a circuit. Lots of people...
  4. jimbo69ny

    Best laptop battery tester? Opus?

    I searched but I didnt find an answer. What tester/charger do you guys like? I have heard mixed reviews of the Opus. Also I have read that the Opus doesn't read internal resistance which is a feature that I want. Any suggestions would be appreciated.
  5. jimbo69ny

    How do I know if I need a battery isolator?

    Hey guys! I am working on a project to add a battery pack to my 2014 Rav4 EV to extend range. The OEM battery is made by Tesla and uses 2600 mah 18650 cells in a 92s48p configuration. My plan is to add 3400 mah 18650 cells in a second battery pack. My pack will be 92s31p. I thought I could...
  6. jimbo69ny

    C Rating of 18650 cells in my project? Advice please.

    Hello, I am adding a range extending battery pack to my 2014 Toyota Rav 4 EV. The vehicle's OEM pack was made by Tesla and uses 18650 cells. It has a 92s48p configuration. The main fuse for the OEM battery pack is 325 amps. 325 amps / 48 = 6.77 amps. That means each cell could potentially see...
  7. jimbo69ny

    Need help on 18650 battery series/parallel plan

    Hey Guys, In a nutshell I am building an additional battery pack for my 2014 Rav 4 EV to extend the range. The OEM pack is a Tesla built 92s48p with 2600 mah 18650 cells. I am building a 92s31p to run in parallel to the OEM pack. I have room for 9 vertical modules with 10 series blocks in each...
  8. jimbo69ny

    Building a really big pack, could use some advice.

    Hey guys and gals, I'm new here and I just thought I'd say hello. I stumbled across this site while searching for 18650 cells. I just registered and I look forward to reading through your past threads. My name is Jim and I am building a range extending battery pack for my 2014 Toyota Rav 4 EV...
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