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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 7 Jun 2017
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      Directly charging over-discharged li-ion cells with my bench supply. Definitely nothing unsafe going on here.

      9 replies 2 retweets 28 likes
    2. Ridley @ a safe distance‏ @11rcombs 7 Jun 2017
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      Replying to @marcan42

      I directly charged a Ryobi 18V pack (it's just 5 18650s in series) with a lead-acid-battery charger the other day

      1 reply 0 retweets 2 likes
    3. Ridley @ a safe distance‏ @11rcombs 7 Jun 2017
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      Replying to @11rcombs @marcan42

      just needed a few seconds to get the pack voltage up above like 6V or so, at which point the charger accepts it again

      2 replies 0 retweets 2 likes
    4. Hector Martin‏ @marcan42 7 Jun 2017
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      Replying to @11rcombs

      Yeah. 3.7V tablet battery, bypassed protection, couple mins at 100mA brought it from 1.8V to 2.7V and now it's happily charging.

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 7 Jun 2017
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      Replying to @marcan42 @11rcombs

      I *think* 1.8V is still above the "it's gonna go boom if charged" range, but... we'll see.

      2 replies 0 retweets 1 like
    6. Neko May‏ @Neko_Ed 7 Jun 2017
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      Replying to @marcan42 @11rcombs

      2.5V is the lowest I'll let one go. Beyond that it hits the bin.

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 7 Jun 2017
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      Replying to @Neko_Ed @11rcombs

      It varies by manufacturer, but the numbers I read are in the 1.5V to 1V range. Though of course you have to slow charge up to ~2.5V.

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 7 Jun 2017
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      Replying to @marcan42 @Neko_Ed @11rcombs

      Of course if these were standard cells I'd bin them, but (non-fake) Nexus 10 batteries are kind of hard to get.

      4:22 AM - 7 Jun 2017
      1 reply 0 retweets 0 likes
        1. Neko May‏ @Neko_Ed 7 Jun 2017
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          Replying to @marcan42 @11rcombs

          Fair enough. Just be very careful. You don't want to end up with a Note 7. ;3

          0 replies 0 retweets 0 likes
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