Recent content by DIWdiver

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  1. DIWdiver

    Piezo in canister lid / hex nut vs epoxy

    @sween1911 - OP is referring to a 'canister light'. This is a configuration of flashlight that has a small light head separated from the battery canister by a length of cable. It's popular with divers who want a big battery but don't want to hold it in their hand. The battery can is typically...
  2. DIWdiver

    How 'bout those water batteries?

    What technology? Unless you already know something about the technology, what does this link tell you? 1. Patented. Maybe, but do they own the patents? Do they really apply to this device? Are they violating patents? 2. Revolutionary. I doubt it. 3. Rechargable. Probably a lie. 4. No...
  3. DIWdiver

    How Slow Can Li-Ion Be Charged Safely?

    Right, no harm there. But you do want to terminate charge correctly, which means not exceeding the max voltage AND stopping charge after the current drops below C/15 or so. You DONT want to float charge them at the termination voltage. This would degrade their lifetime.
  4. DIWdiver

    Looking for advice for on the go charging of battery packs

    An XHP50B-00-0000- 0D0BJ440E (XHP50.2) configured for 12V should produce 1000 lm at 625 mA. This LED is 4000K, 70 CRI, and currently in stock at a distributor I use often. Vf should be around 11.2V at this current. This is 7W and over 140 lm/W. With a 4S LiIon Pack, an LDO linear...
  5. DIWdiver

    Charger that stops at voltage?

    That's a good idea. Constant voltage, constant current is exactly how LiIon cells are supposed to be charged. Lab supplies (aka bench supplies) can be had pretty cheap these days.
  6. DIWdiver

    Charger that stops at voltage?

    The Dragon VP4 plus manual says the charge voltage is 4.2 +/- 0.5V. That's pretty high for long-term storage. Given your use pattern, your batteries (cells, if I'm being pedantic) would live longer if you turned the lights on for a few minutes (3% or more of expected run time) after topping...
  7. DIWdiver

    Charger that stops at voltage?

    Yeah, charging those cells at 1C could draw 75W or so from USB. You would have to be more careful to make sure your host and charger were up to it.
  8. DIWdiver

    Charger that stops at voltage?

    Hi pipes. 1. Some 'hobby' chargers have programmable charge termination voltage. I've seen one that has limited program ranges for various lithium chemistries, but not nickel chemistries. The common iMax B6 (and very likely its many clones) has none. I'd guess very strongly that all the...
  9. DIWdiver

    Macro Ring Light

    Hey, I recognize that yellow light. Or at least the head. I bought one a few years ago, and have been impressed with it for the cost. Mine is 4AA, and has a lever switch. Looks like yours is a tail twisty?
  10. DIWdiver

    100ish watt xhp 70.2 watercooled build.

    When most people talk about a mosfet driver, they talk about a device where the fet is intended to operate like a switch, and the current is limited by a number of things, including the battery, LED, wiring, and yes, the fet. For this to work, the LED and the battery generally have to be pretty...
  11. DIWdiver

    Hole in beam 5 mm LED

    Larger LEDs typically don't have bond wires crossing over the top of the die. But I've never seen a 5mm LED that didn't have a bond wire right in the middle of the top of the die. It's not hard to see if you have good eyes or good magnification. In a fairly narrow beam LED, the bond point and...
  12. DIWdiver

    XPL vs XPL-HI

    The XP-L has a dome on it, the HI doesn't. The dome increases total light output in lumens (explanation on request), but it also magnifies the apparent size of the die. This causes a reduction in the apparent surface brightness of the die. Surface brightness, not total lumen output...
  13. DIWdiver

    RC car batteries - LiPo v Li ion, chargers

    AFAIK, cylindrical cells are either LiIon or LiFe, while soft-sided pouch cells are LiPo. If you have something else, then all bets are off. As vicv says, LiIon and LiPo are theoretically interchangeable. However, the issue is often that one doesn't physically fit very well in an application...
  14. DIWdiver

    How to remove star

    If the existing compound is rubbery, it should be pretty easy to pop off the star and scrape off the residue. If the existing compound is pretty hard, it's probably an epoxy, and may take quite a bit more to pop off the old star. Acetone will soften or dissolve some epoxies. It takes quite a...
  15. DIWdiver

    New lifepo4 batteries

    So... Most phone and tablet batteries are pouch cells, laptops are a mix (recently mostly pouch) and until recently most or all tool batteries were cylindrical. The only fires that I hear about are in phones and tablets. Do tool fires happen and I just don't hear about them? Or are tools for...
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