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  1. H

    1S 18650 Pack Discharger

    Thanks for the input. Will review.
  2. H

    1S 18650 Pack Discharger

    Struggling to find a good 1S 18650 pack discharger. Will be used with 1S4P 18650 and 1S8P 18650 packs. Requirements: 1) Be capable of discharging packs down to 3.2v but ideally 3.0v. 2) Discharge at 2A or more 3) Discharge these large capacity packs in a single run (iMaxx dischargers time out...
  3. H

    How Slow Can Li-Ion Be Charged Safely?

    Many discussions abound regarding fast charging but relatively few regarding slow charging. I'm planning to make some 1x 1S4P and 2x parallel 1S4P long run time lights using 3.4Ah cells. This will mean 13.6Ah and effectively 27.2Ah packs. Most chargers are limited to 3-5A which would leave...
  4. H

    Charger for 1S4P Pack

    3A is unfortunately going to be around .22C and thus below the .3C using the NCR18650GA. Any risk in charing these cells (plating, etc) using such a low charge rate? Was also considering an application that would use 2x of these 1S4P packs in parallel so a .3C rate would be 8A and a .5C rate...
  5. H

    Charger for 1S4P Pack

    Thanks. Had planned on giving them a call today as I found the same. I'm surprised by the number of 1S3P and 1S4P packs sold but next to no chargers that are available to charge them.
  6. H

    Charger for 1S4P Pack

    Good morning. I'm working on a project that uses a 1S4P pack of Panasonic NCR18650GA but am having trouble finding a charger or charge board that can support the 4.0A (.3C) - 6.8A (.5C) charge needed for the pack. I've checked Battery Source, Amazon, Power Stream, eBay, etc but most multicell...
  7. H

    Charge 4S2P NiMH

    Thanks. Understood regarding series/parallel voltage/capacity. I just wasn't sure charging in series was any different. If killing the cells via trickle charge would there be risk of a violent failure or simply a loss in capacity until the cells were no longer functional?
  8. H

    Charge 4S2P NiMH

    Thanks, this has been very helpful. Is there any amount of trickle charge that will not hurt LSD type batteries (Eneloops)? The charger above indicates that it moves to 80mA trickle charge. Would a 4S2P pack of Eneloops (assuming 2,000 mAh) contain 16,000 mAh or 4,000 mAh for charging...
  9. H

    Charge 4S2P NiMH

    Thanks for the input. So, any initial balance charging could be done with the pack in a 4S2P configuration using the linked to charger by simply leaving it plugged in for a few hours after full on it's first charge?
  10. H

    Charge 4S2P NiMH

    I've been searching for an answer and haven't been able to find much (which could be an answer in and off itself). I'm looking at stitching together my own 4S2P pack of NiMH (eneloops) batteries. Is it possible to charge a pack like this with a wall based charger (link below) or an Imax B6...
  11. H

    A Question on Parallel Circuits

    Thanks everyone for the replies. This has been helpful. Electrically there is no difference between A and B so I'll likely move forward with B out of simplicity. Retro - I'm trying to squeeze every last bit of efficiency out of the flashlight. I thought adding series resistors, no matter...
  12. H

    A Question on Parallel Circuits

    The risk, as I understand it, in running LEDs in parallel is that the LED with the lowest forward voltage could begin to hog the current, warm up, and begin down the path of thermal run away until it eventually self destructs. The thinking in the drawing above is that the fewer LEDs running...
  13. H

    A Question on Parallel Circuits

    I'm making a one off array of 6x LEDs in parallel and have a quick question. I understand the logic behind not running LEDs in parallel but this application requires it. Apologies for the ugly drawings but from an electronic perspective, is there any difference in these parallel circuits? In...
  14. H

    4.5v LED Strip

    Tim - thanks for the response. Google is very much my friend and I've combed through it. 9v and 12v strips are no problem. 4.5v colored strips also no problem. Difficult is bright white or warm white 4.5v strips. I know in this hobby there are quite a few reliable retailers that stock some...
  15. H

    4.5v LED Strip

    It's not a flashlight I'm after this time but 4.5v LED strips. I'd prefer them to be the flexible ribbon type strips but the rigid ones could work as well. Need 4.5v so I can easily operate them with 3 NiMH cells. 12v is just too many cells for my application. Hoping to find them in white or...
  16. H

    Host Recommendation

    PLEASE DELETE
  17. H

    Sipik 68 Clones - How so cheap?

    As I continue to slip further and further into flashlight oblivion I haven't been able to rationalize how they're able to be sold so cheaply. Even in the enormous quantities they're undoubtedly made in, I can't get it to add up. Circuit, heat sink, and LED prices are no big deal but I can't...
  18. H

    Source for Bonded Wire?

    After an exhaustive search, I spent some time on the phone with Belden this AM and am told they have a solution. For anyone that may dig this thread up in the future: Smallest bonded or zip cord style wire they make is 24 AWG and it's dimensions are .058" x .115". Part number 8782. Link to...
  19. H

    Source for Bonded Wire?

    Thank you for the recommendation. Believe it or not (and I feel really dumb about this) but I can't seem to find any 26 AWG zip cord in their catalogues. If you happen to have a link, I'd be very appreciative. Thanks
  20. H

    Source for Bonded Wire?

    Essentially looking for 26 AWG zipcord (seen it called numerous things before).

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