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  1. BatteryMooch

    There now IS a Samsung “58E” 21700

    March 30, 2025 edit: I posted about this a while ago to my patrons, there now is a Samsung 58E floating around…model number CC5733F101 Ver A with “58E” on the can. The CC5493F101 Ver C discussed below is still definitely the 55E and not the 58E. *********************Original post...
  2. BatteryMooch

    Bench Test Results: AM04 - 45A 4000mAh 21700

    THIS REPORT IS BASED ON MY TEST RESULTS, RESEARCH, AND DISCUSSIONS WITH PEOPLE IN THE BATTERY INDUSTRY. ALL STATEMENTS HERE ARE JUST MY PERSONAL OPINIONS AND ARE SHARED ONLY FOR INFORMATIONAL PURPOSES. The full AM04 test report (two documents) is done and posted to my Patreon wall so I can...
  3. BatteryMooch

    Is the Molicel P50B “tabless”? I tore one down to find out…

    TL;DR…no. This cell uses the same tab design as other round li-ion cells, but has more tabs to reduce internal resistance and increase current handling. Images: Some observations and comments: NEVER TAKE APART A LI-ION CELL! Even a tiny spark can ignite the flammable electrolyte that is...
  4. BatteryMooch

    Any EVE 40PL available for purchase? Would love to test these. FOUND!

    I have been unable to find any of these so far. Anyone have two they would sell or know of a source? Thank you! Samples located and on the way!
  5. BatteryMooch

    Bench Test Results: Molicel P45B - 50A 4500mAh 21700…an extraordinary cell!

    As Battery Mooch I tested these cells in January for my Patreon supporters and have been torture testing them along with the Molicel P42A and the Samsung 40T since then. With the release of the Molicel P45B hopefully coming soon it’s finally time to post some test results. The cycle life torture...
  6. BatteryMooch

    Metal-Clad PCBs vs. FR-4 Thermal Performance Article

    I swear there was a LED-related thread here discussing the OP's desire for a MCB (metal-clad board) instead of an FR-4 board with lots of thermal vias, but I can't find it now. Here's an interesting article comparing the two options, with test results...
  7. BatteryMooch

    "Average" motorcycle starting battery?

    For a project I'm working on I need a new lead-acid motorcycle starting battery. I'm looking for one from one of the most popular manufacturers, representing (as much as possible) what an "average' battery might be in terms of quality, CA, CCA, capacity, etc. I realize that there's a huge range...
  8. BatteryMooch

    Run time reality check needed

    Don't know why I'm having so much trouble getting my head around this calculation. It's not for an e-bike but I'm hoping you guys can help. :) The question is...If I have a 300uA constant load on a pack, how long will it take for 1.8Ah of capacity to be used by the load? My calcs were as...
  9. BatteryMooch

    For those building FET drivers...

    ...here's a new Microchip doc, "Avoiding MOSFET Driver Overstress": http://ww1.microchip.com/downloads/en/AppNotes/01327A.pdf
  10. BatteryMooch

    Online Course: Fundamentals of MOSFETs For Switching

    Just a FYI... Int'l Rectifier has a pretty good intro course (40 minutes) on the use of MOSFETs in switching applications: http://www.techonline.com/learning/course/222200678?_requestid=58702
  11. BatteryMooch

    CBA II Thermal Analysis -- Does the CBA run too hot?

    Hello all, After hearing of several CBA II's burning out their MOSFETs, often along with other components, I decided to do a thermal analysis of the CBA. I've posted it at: http://www.camlight.com/techinfo/CamLight_Systems_CBA_II_Thermal_Analysis.pdf For those who don't want to wade through all...
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