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  1. O

    Can someone identify?

    Not really, since 99% of the supply went to Tesla. What does the top look like of that cell? Just google for the cells specification.
  2. O

    Can someone identify?

    Probably Tesla Cells, as they use/used Panasonic 3400mAh Cells that are unwrapped. Source?
  3. O

    Building my first pack, need some help.

    Have you ever done any proper testing for that claim? So far I've never seen you trying to fix them and do a long term test on how they hold up.
  4. O

    Heat evac: 26650 vs 21700

    if both are exactly the same cell and just their surface is different, obviously the cell with the larger surface area will stay cooler how hot a cell gets is determined by its internal resistance, current health and surface area
  5. O

    Building my first pack, need some help.

    I've seen videos of people hacking a relay to it, so it turns off when the voltage gets too low.
  6. O

    Building my first pack, need some help.

    The TP4056 stops to charge, when the battery is only taking 55mA of charge at 4.2v. Meaning the lower the cell voltage after charging, the lower the capacity of the cell overall. Depending on the capacity, I'll go down to 4.1v in 30 days. Heaters can often be fixed, however i dont know if its...
  7. O

    Are these lead acid batterys suitable to build a powerwall with?

    Yeah found that out myself, too bad you can attach measurement cables to each individual cell inside them :/ That would help well with keeping them alive for longer.
  8. O

    Are these lead acid batterys suitable to build a powerwall with?

    I wish you a lot of luck with them ^^
  9. O

    Are these lead acid batterys suitable to build a powerwall with?

    Thats quiet a deal when you get them for free. However as they are already used since 3 years, they probably wont have much life in them left. As by the manual, the service life is only 4 years if the battery is being kept at 20°c, after that it only has 80% capcity left which is falling...
  10. O

    Help with cell and other questions

    I do not reccomend to get them, their power connector breaks off extremely easiy. Its better to just get a good 4 bay charger with discharge capacity function.
  11. O

    What brand battery?

    Red Wrap & no model Number = pretty much always Sanyo Have fun trying to find the actual model number, as its possible that its not in the list. I have a couple of them.
  12. O

    Replacing lead acid to 18650 on my garage door opener.

    Lead batteries should be charged at 0.2c, most door openers have a battery with 5-10Ah, so the charger itself should already be limited to 1-2A. And i also doubt, that he is going with a 4s1p config and even if, the charging current should still be fine, discharge however might not. While yes...
  13. O

    Replacing lead acid to 18650 on my garage door opener.

    just use a buck converter to change the charging voltage i'd go for 4s charging the batteries up to 15v (3.75v), that should still be within the limits of the door opener circuit and keep the batteries at a happy charging state, so they dont degrade as fast.
  14. O

    JAAAAAACKPOT !!!

    You americans are so lucky, next to free batteries left and right ._.
  15. O

    JAAAAAACKPOT !!!

    That really is a jackpot and i'm very jelaous of it. You can hack some 26650 holders onto the Opus charger like floydR already mentioned and change the voltage with the switch inside it.
  16. O

    My future 1st solar

    1. Yes, if one gets shaded, the whole string will loose its power, Voltage might stay high, but ampers will go down significantly. You probably need a higher Solar Voltage than your battery voltage, so putting 3 in series is the best option there. 2. Go on Aliexpress and search for DALY Smart...
  17. O

    Help with current output of a 12v battery.

    No, it would still have a rating of 50 amps. 3p would still be fine, since motorcycle/car batteries are often overrated.
  18. O

    Help with current output of a 12v battery.

    For a 12v battery replacement for a motorbike / car, you would need 4s, not 3s. If you put 4 in parallel, it should handle it without a problem, you could even go with just 3p.
  19. O

    Red hot sanyo thread

    Probably deleted, cant find any information on that topic besides beeing mentioned in other threads. My solution to hot Sanyo cells is, to charge them until they get warm, let them sit for 2 days, charge them again. Nearly all my cells Sanyo cells still work just fine. Don't know why they...
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