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  1. I

    MIT says future rechargeable batteries could be safer and last much longer

    Interesting read here: https://news.mit.edu/2015/solid-state-rechargeable-batteries-safer-longer-lasting-0817
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    problems with Condor 5000 charger

    I have a really old Condor 5000 charger for NiCd batteries. The charger has four slots that are divided into two groups of two, and there is an indicator LED for each group. The problem is that one of the LEDs no longer turns on. At first I thought the batteries were bad - after all, they are...
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    Steren digital multimeters: are they any good?

    Some of the digital multimeters from Steren have rather attractive prices and mostly positive reviews on Amazon. Does anyone know if they're actually any good?
  4. I

    looking to replace ThinkPad T42 battery

    Thanks for the feedback, everyone. Also, would this be a good choice? It has pretty positive reviews.
  5. I

    looking to replace ThinkPad T42 battery

    Yeah, I would be convinced that the more expensive cells are of higher quality. You get what you pay for, right?
  6. I

    looking to replace ThinkPad T42 battery

    Is anyone here familiar with laptop batteries? If so, I need your expertise: The battery for my ThinkPad T42 is very old, and a full charge holds only a little more than a quarter of its design capacity. However, Lenovo no longer sells this particular battery. Instead, replacements are offered...
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    Maha MH-C808M charger unsafe?

    A lot of people are saying that the Maha MH-C808M is the best universal charger available. However, at least two Amazon reviewers have reported that their units have caught fire. http://www.amazon.com/review/R19GRNG2ACW6RU/ref=cm_cr_pr_cmt?ie=UTF8&ASIN=B000E65DG6...
  8. I

    Actual dangers of un-protected Li-ion

    I have an unprotected li-ion cell, and it has not given me any trouble yet (emphasis on "yet").
  9. I

    safe to put AA cells/C shells in a 360 Lumen flashlight?

    My family just got two Life+Gear 360 flashlights, which use three C cells. I don't have many C batteries at the moment, but I do have quite a few AA ones, as well as some C adapters that use AA batteries. Is it safe to use AA cells in these lights? I'm asking this because I've heard that it can...
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    replacing built-in batteries?

    I've noticed that many "rechargeable" flashlights use built-in batteries. However, there are two major disadvantages with built-in cells: 1. When the electricity runs out, you have no choice but wait for the battery to recharge. 2. The battery will eventually wear out, and the flashlight would...
  11. I

    identifying manufacturers of lithium-ion batteries?

    I guess I should definitely invest in some better batteries some time in the future, then. The same goes for the charger, as I've heard some reports that DSD chargers are not good. From what I hear, chargers and batteries from Pila and AW, respectively, are good choices.
  12. I

    identifying manufacturers of lithium-ion batteries?

    I see. Are there ways to tell if a battery is protected, though? By the way, I once measured the voltage of the battery after recharging it and got a reading of 3.7 V. I'm not sure if that helps, though.
  13. I

    identifying manufacturers of lithium-ion batteries?

    I guess mine may be an exception, then. If I use my laser (a Spyder I Pro) for a long time, it will suddenly become very dim, but recharging the battery solves the problem. Does this mean that my battery is protected?
  14. I

    identifying manufacturers of lithium-ion batteries?

    The model number on mine has nothing after the "18650" part. The battery just says "LC ICR18650" on it; I don't know if the "LC" means anything. However, search results seem to agree that the battery originated from Guangdong, China. By the way, does the "ICR" stand for "IC regulated" or...
  15. I

    identifying manufacturers of lithium-ion batteries?

    This is probably a silly question, but is it possible to identify the manufacturer of a lithium-ion battery by the text printed on the battery? Lithium-ion batteries are not usually sold to end consumers directly, so they normally won't have flashy labels on them. However, they generally have...
  16. I

    should I use up my li-ion battery before recharging it?

    Gotcha. Thanks!
  17. I

    should I use up my li-ion battery before recharging it?

    I have a pre-charged lithium-ion (18650) battery that was included with my "Spyder I Pro" laser from Wicked lasers. I know that some batteries have the memory effect; users are recommended to use up all of the charge before recharging the battery for the first time. Do lithium-ion batteries...
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    Why do "18650" batteries look so plain?

    I've noticed that common types of batteries often have a flashy appearance, complete with the company's logo and a small panel with safety information. In comparison, lithium-ion batteries are often nondescript in appearance, having nothing except the company name. I'm guessing this is...
  19. I

    my battery had its polarity reversed?

    Something really strange happened. I was using a multimeter to check the voltages of some of my batteries, and one of them seemed to have a negative voltage. But when I connected the positive end of the multimeter to the negative end of the battery and vice versa, I got a positive reading again...
  20. I

    fresh batteries not yielding peak power

    Thanks for the information. I was always uder the impression that lasers perform better when the batteries have a higher voltage. It seems that I was wrong. By the way, I do think the batteries were indeed the Toshiba "super heavy duty" ones.

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