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  1. BatteryMooch

    Teardown: LithiumPros LithiumPowerPack 12v and 36v

    Thanks for posting those! I can see the Microchip MCU and some latches, perhaps to hold the balancing channel on/off states. Can’t read any other chip numbers but no worries as I’m not going to dive into the design any further. Always really enjoy seeing how a commercial BMS is designed and laid...
  2. BatteryMooch

    Teardown: LithiumPros LithiumPowerPack 12v and 36v

    Thank you @amberwolf for the extra photos. That’s a burly-looking BMS…wow. For the resistors you noted, I agree. I’m amazed though by the number of passives in the central portion of the board. But perhaps that’s due to its age, before the high level of integration (into single chips or low chip...
  3. BatteryMooch

    Teardown: LithiumPros LithiumPowerPack 12v and 36v

    Thank you for posting that teardown! Considering the price, that pack would technically be called A Piece Of Junk. The cell handling/mounting is almost criminally negligent. That BMS has a huge number of passives. It would be great to see the other side if not too inconvenient. Interesting...
  4. BatteryMooch

    Charging/Storage Tub

    A few thoughts…. - Water and aqueous firefighting solutions are the most effective way to fight a li-ion fire. The water helps cool the cells below the thermal runaway threshold temp, stopping the reaction, and is more than adequate for putting out the “conventional“ fire from the plastic...
  5. BatteryMooch

    Tabless design cylindrical cells tests

    I’m thinking we still need to see the “tabless” 18650’s and 21700’s actually go tabless. All of them still have a cathode tab (from current collector plate to the cell contact) and the BAK 45D even has an anode tab.
  6. BatteryMooch

    Tabless design cylindrical cells tests

    This might have been part of CATL’s lawsuits against CALB, which CALB pretty much lost (but are appealing), and so the tech is not being used by others? And CATL might have thought it just wasn’t worth the expense of finishing development and modding their production line(s) for the small number...
  7. BatteryMooch

    Tabless design cylindrical cells tests

    Each grade has its own acceptable level of capacity variance. So ”Grade B” doesn’t have a larger than acceptable variance for the manufacture, just larger than what could make it “Grade A”. It could be perfectly acceptable for a “Grade B” cell and millions upon millions of them are used...
  8. BatteryMooch

    Cycle life tests of High Energy density cylindrical cells

    There’s the remote possibility that they were a return (from a previous customer) too.
  9. BatteryMooch

    Cycle life tests of High Energy density cylindrical cells

    Sounds like they were tested by someone, maybe at Nkon or maybe by their supplier.
  10. BatteryMooch

    Tabless design cylindrical cells tests

    Yes, tabless: https://www.highstar.com/companynews/317#
  11. BatteryMooch

    Tabless design cylindrical cells tests

    The Z30 is looking pretty close to the LT 19660’s (JP30?) I recently tested. It will be very interesting to do a shootout with those two and the 30D!
  12. BatteryMooch

    Are Solid-State Batteries the Game Changer?

    Hmm…hadn’t considered that. And I am usually am pretty skeptical/suspicious…😔
  13. BatteryMooch

    Are Solid-State Batteries the Game Changer?

    A couple years away from full production, still LOTS of work to do to scale up production successfully (high enough yield), expensive as all heck, other tech like Na-Ion catching up with a lot of (true) solid-state battery (SSB) benefits. CATL just announced a 2025 release of their Na-Ion cells...
  14. BatteryMooch

    Cycle life tests of High Energy density cylindrical cells

    Interesting! i haven’t heard about it and it’s not mentioned in their 2024 annual report (recent cell developments).
  15. BatteryMooch

    Tabless design cylindrical cells tests

    Nothing, if I had an opinion I could express. But I am just not able to say it’s definitely the 50PL as that wouldn’t be true and exposes me legally. Even if I offer just an opinion and someone blows themselves up, even if their fault, I’ll still be named in the lawsuit for sure. Each person...
  16. BatteryMooch

    Tabless design cylindrical cells tests

    Bench Test Results: “EVE 50PL” (unconfirmed) - 50A/125A 5000mAh 21700 Tested for my Patreon supporters last month but here’s the full test report: Bench Test Results: “EVE 50PL” (unconfirmed) - 50A/125A 5000mAh 21700 WE DO NOT KNOW IF THIS IS ACTUALLY THE EVE 50PL. YOU USE IT AT YOUR OWN RISK!
  17. BatteryMooch

    How is this voltage sag on my 22S2P LFP battery

    Agreed! Good point. All depends on whether the pack voltage is the sum of the cell voltages (where most of other resistances don‘t matter) or it was measured at the main terminals (where most of other resistances do add on). For accuracy though it should be at the main terminals IMO as that’s...
  18. BatteryMooch

    How is this voltage sag on my 22S2P LFP battery

    You also have to add in the resistances for the spot welds, cell interconnect material/wiring, solder joint to the main leads, main leads, and connectors….can sometimes be pretty substantial.
  19. BatteryMooch

    Silicone Carbide + Semi Solid State

    I’m curious…what makes 30% optimal? Especially since you say 55% is max and an all-silicon (100%) anode is the holy grail for some development efforts. If 30% was indeed the optimal level then it seems there would be no need to go beyond that since it increases cost and requires additional...
  20. BatteryMooch

    Silicone Carbide + Semi Solid State

    I was referring to the Alibaba cells mentioned at the top of @kagemushablues poat and thought you were too. 🙂
  21. BatteryMooch

    Silicone Carbide + Semi Solid State

    I’d be very surprised if these cells used something as expensive as SCC55 in their anode. Probably just tossed in some silicon and compliant binder to handle the expansion. We can only guess…fun to do though.
  22. BatteryMooch

    Cycle life tests of High Energy density cylindrical cells

    I’d be stunned if that was true as it would be ”corporate suicide”. Their large customers would drop them quickly and buy from another manufacturer rather than deal with the nightmare of changing cell performance…IMHO. But in the cutthroat world that is cell manufacturing, especially when China...
  23. BatteryMooch

    Cycle life tests of High Energy density cylindrical cells

    Thank you for posting your experiences with these cells! It’s rare to have the same cell, even of different grades, perform so differently like that. And FEB would never sell “better” cells to a company as small as Vapcell instead of to their huge commercial customers (buying millions of cells...
  24. BatteryMooch

    Cycle life tests of High Energy density cylindrical cells

    I’ve got a pair of each in transit and am looking forward to seeing how they perform. Vapcell can be a little optimistic with capacity ratings, “rounding up” datsheet ratings, but their current ratings are usually pretty close (but might be temperature-limited).
  25. BatteryMooch

    Cycle life tests of High Energy density cylindrical cells

    Interesting that the nominal voltage drops on their highest and lowest capacity cells. All still in development so maybe that has something to do with it.
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