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  1. Overmind

    Opus behaviour: Normal?

    80mm PC fan does the job, no interruptions.
  2. Overmind

    Moli Energy ICR-18650H Cell Specifications

    I had one (recovered from a pack, the only left alive), used it for flashlights for a couple of years.
  3. Overmind

    18650 vs other cells?

    I disagree. Both the demand and supply are still growing significantly. There will be significantly more 21700s produced, maybe even a good growth in 26XX0; 21700s will gradually take over some market segments of the 18650. but 18650 is still the main and will remain so for most applications...
  4. Overmind

    Add 36V Battery Block to 48V Battery System?

    Can't you add a 12-V pack in series with the 36-V one ?
  5. Overmind

    Spot welding on batteries with residual solder

    Why not just polish the surface enough for good contact ?
  6. Overmind

    What are some practical techniques for sorting cells in bulk quickly?

    @Wolf yes, but the dots I put on the bottom and are very small. Example (pic is from the net). Dots can be distributed not to look ugly also.
  7. Overmind

    Sony US18650GR (G5) Cell Specifications

    Still got some of these alive. They lasted longer than 2400/2600s (G7/G8s). @Hyraelle Looks authentic to me.
  8. Overmind

    Samsung INR18650-25R Cell Specifications

    The green in the pic is abnormally dark.
  9. Overmind

    When things go wrong... it can go really wrong!

    The questions of Redpacket are sound. That info is relevant.
  10. Overmind

    What are some practical techniques for sorting cells in bulk quickly?

    Red means 1k, green 500, blue 100. There's no need for higher accuracy than 100 since that's values under are usually tester's tolerances.
  11. Overmind

    Advice when constructing 18650 battery pack

    Try putting samsungs 30Qs which are 15A; that would fix your current problem; or add more rows in parallel. Alternately, try to find 26650s that also support higher current.
  12. Overmind

    Overview and Testing of Big Battery 12V 170Ah LiFePO4 Lithium Battery

    Would be nice to see cycle testing. Many doubt the 3000+ cycles stated for most LiFePo4s.
  13. Overmind

    What's Inside a 12V K2 Energy K2B12V19EB LiFePO4 Battery?

    Would be nice a test of the cells inside. Or to find out more like the max discharge current per cell.
  14. Overmind

    What are some practical techniques for sorting cells in bulk quickly?

    I color-code the capacity using colored dots. It's too ugly to write it with a marker on them.
  15. Overmind

    China batterie 18650 test - 508.800mAh in 62 cells

    Yes, older ones were better. Now-days they are ultrafake, ultralight. Good for various other experiments though.
  16. Overmind

    China batterie 18650 test - 508.800mAh in 62 cells

    Found an ultrafire fake in a flashlight pack that actually had above 1000mAh. That's a record.
  17. Overmind

    Red Sanyo 18650 Cells Getting Hot While Charging

    @giacomo160 cooling helps, but it's better to let it stabilize for a few days like I said some time ago.
  18. Overmind

    Anyone willing to share a good LTO supplier?

    I always have some stock of various cells.
  19. Overmind

    Lithium Battery for UPS

    Yes, I started to used them for UPS units instead of lead-acid. The extra capacity and most likely extra life time is what I want, not the raw discharge rate of lead-acid.
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