Recent content by wptski

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  1. W

    KaBoom! Ya Think?

    True, there aren't any 7.2V cells, cell means singular but batteries means a pack or more than one cell. Depending on the chemistry, they are either 3.6V/cell or 3.7V/cell. In this case these batteries are marked 7.2V although most any charger these days use 3.7V/cell as a standard or...
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    Checking my DMM DC Voltage Accuracy

    If you want a good one but not cheap look here: http://www.voltagestandard.com/DMMCheck.html
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    KaBoom! Ya Think?

    Just purchased an accessory LED light for a camcorder which comes with two Li-Ion 7.2V 2200mA batteries which are wired in parallel. It comes with a wall charger for one battery but the unit has a so-called charging port marked 7.4-14.8V DC and nothing mentioned as to the current rating needed...
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    Desolder a bad battery pack??

    If it has 12 cells knowing if it's a 14.4V or 7.2V pack would be good as you can get a pack spot welded and you can do the remaining soldering into circuit. I use this site: http://www.cheapbatterypacks.com/custompacks2/CustomPacks.aspx
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    Pros & Cons of CV charging Li-Ion

    They'll be in a holder that has a PCB so no danger there. Still waiting on the holder so I rigged up two 18650s in series which worked fine but I plugged in the wallwart/charger the load on the batteries increased by just under a 100mA which I wasn't expecting. The modder didn't explain in...
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    Pros & Cons of CV charging Li-Ion

    What are the pros & cons of CV charging Li-Ion all the way? What I have is a device that normally uses a 4.8V Ni-MH pack but it will accept 8.4V at a lower current. I'm going to use a 2S1P 18650 protected holder with raw cells. This is part of a mod where the charging circuit was modified as...
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    DeWalt Li-Ion battery pack and chargers

    The specs that I posted above show that charger draws 2.1A AC current so that's it. You don't use the cell count multiplied by 3A. It's like the popular C9000 charging four cells each at 2A, charger input is 12V at 2A but the wallwart has an input of 1.1A AC current.
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    DeWalt Li-Ion battery pack and chargers

    Why have a data sheet and give a thumbs up to Makita? Maybe that's why the Sony VTC4/5 isn't manufactured anymore? Read here: https://www.powerstream.com/sony-vtc-availability-letter.htm If you'd follow the 1C rule, maybe your Makita packs twice as long? The truth is opinions are abundant...
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    DeWalt Li-Ion battery pack and chargers

    Where are you getting Sony suggests 2.5C from? Their specs are 1C for a VTC5 clearly states 2.5A which is 1C. This isn't about what you and your boys are doing, it's about what manufacturers suggests. You think Sony doesn't know what they are talking about?
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    DeWalt Li-Ion battery pack and chargers

    Please provide a valid link stating that charging over 1C is good to do. PowerStream suggests 0.2C-0.7C charging rate. Why would DeWalt have two different Li-Ion 20V Max chargers if only one is needed? The following specs for those cells don't see to agree with what you said. VTC4 specs...
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    DeWalt Li-Ion battery pack and chargers

    Look below here. Their Milwaukee 48-59-1801 charger, output is 3.1A charges a 48-11-1815 which is a 2Ah battery in thirty minutes which means what? Of course, >1C rate. Any time, anything charges in less than an hour is automatically >1C. "][/URL]
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    DeWalt Li-Ion battery pack and chargers

    Funny, this very thing about Milwaukee came up in another forum. If you look at the PDF for Red whatever charger, it lists a thirty minute charge on the 2Ah battery which means they are doing the same thing. The PDF isn't on my tablet here but IIRC, it was a 3.1A output charger.
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    DeWalt Li-Ion battery pack and chargers

    It was charging at 4A on a 2Ah battery so I stopped it and used the 2A charger which I'll use from now on. Nowhere does it state that charging at 2C is good for a Li-Ion battery/cell. They use 3.6V cells also.
  14. W

    DeWalt Li-Ion battery pack and chargers

    The reason the screws had shallow heads were indeed tamper-proof just two were better! I used a 1/32" drill to undo the tamper-proof. I was worried that all the battery contacts might be soldered right to a PCB but they aren't so I can measure current with a clamp meter/probe. I run down my...
  15. W

    DeWalt Li-Ion battery pack and chargers

    A good idea! I didn't notice if they have tamper-proof Torx screws as they do on their battery packs. I was also thinking about measuring the input current as the 2A charger draws .7A AC and the 4A charger draws 1.5A AC. Just looked, T15 Torx screws in a one inch deep hole with very shallow...
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