Post 9hx9CREPyfFejx1yQy by kellerfuchs@vulpine.club
(DIR) More posts by kellerfuchs@vulpine.club
(DIR) Post #9hx8sr0cQasMtbEoNc by kemonine@social.holdmybeer.solutions
2019-04-19T03:40:21.469781Z
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WellThat feels like it's wrong4.34V is definitely >4.2V which is where these batteries are rated🤔
(DIR) Post #9hx904Y4UEEaunKL56 by kellerfuchs@vulpine.club
2019-04-19T03:41:29Z
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@kemonine If they are new, that's not very surprising :3
(DIR) Post #9hx91nH5gJEFv7Cmy8 by kemonine@social.holdmybeer.solutions
2019-04-19T03:41:58.477401Z
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@kellerfuchs Fresh from the packaging, but the xtar showed only 4.2VAnd they have been feeding an arm board for awhile now...
(DIR) Post #9hx948vs850TfaOuAK by ari@yiff.life
2019-04-19T03:40:53Z
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@kemonine Context?
(DIR) Post #9hx95QOegPyG7jTVUu by kemonine@social.holdmybeer.solutions
2019-04-19T03:42:37.822656Z
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@ari Maxim fuel gauge on i2c on a raspberry pi 3b+
(DIR) Post #9hx9CREPyfFejx1yQy by kellerfuchs@vulpine.club
2019-04-19T03:43:41Z
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@kemonine Yeah, there's a bunch of variability in batteries manufacturing, so the nominal voltage is definitely not a hard limit.Usually, good constructors will give you a confidence interval and hard limits in the datasheet though (along with the discharge curves and such)
(DIR) Post #9hx9HtGZAlnt8UdSi0 by kemonine@social.holdmybeer.solutions
2019-04-19T03:44:52.971332Z
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@kellerfuchs Yeah...Yeah, I've had 18650's report >4.2V sometimesPart of why I went with some Samsung cells this time around3500mah INRs to be a little more specific
(DIR) Post #9hx9V1PEDkOg94wsDo by ari@yiff.life
2019-04-19T03:45:14Z
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@kemonine Huh. Brand new batteries or something? I could like...maybe see batteries coming slightly overcharged to account for losses in transit. I think when you first made a battery you don't necessarily have to charge it since everything's where it's supposed to be in the charged state in the first place?
(DIR) Post #9hx9V5vzNsymBqJ5qC by ari@yiff.life
2019-04-19T03:46:56Z
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@kemonine I mean I'm DEFINITELY not a chemist, but iirc the thing with rechargeables is that you have some particle that migrates from one material to the other and that generates the charge. Because they degrade over time maybe that's why too. You build the battery from-factory with a little over the stated capacity and just use the circuitry to bump *up* the voltage...?
(DIR) Post #9hx9aj0JYEoCoK0yXI by kemonine@social.holdmybeer.solutions
2019-04-19T03:48:17.226320Z
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@ari 'unnoFirst time with this particular MAX ic and some other stuffSniffing around right nowThese are brand new and came with ~3.5V of charge so I put them up on the xtar charger and am now working with them in their final home.we'll see what happens soon
(DIR) Post #9hx9lADTEQli6U97Mu by ari@yiff.life
2019-04-19T03:49:37Z
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@kemonine Oh okay, so they're 3.5V batteries. I....probably wouldn't use them? It sounds like their protection circuity is wonky if they're being overcharged by that much. Unless it's an application where they won't be recharged.
(DIR) Post #9hx9pOokt0GiXzbarI by kemonine@social.holdmybeer.solutions
2019-04-19T03:50:56.363524Z
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@ari oh, they are 4.2V cellsThey just came at ~50% capacity 😉 Looks like they are reporting 4.3V through the MAX chip though🤷 I'll torture this board a little and see what happens for the battery levels.I've seen slop in the past, just not so explicitly
(DIR) Post #9hxA3XJu4TgiyGuq1o by ari@yiff.life
2019-04-19T03:52:31Z
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@kemonine Ohh, okay. I got thrown off since 3.5 is so common. I thought they were supposed to be 3.5, had an absolute "never go over 4.2 volts ever" on them c:0.1v might be a doable tolerance depending on the use case. What's the @kemonine max board for?
(DIR) Post #9hxA8FPK65WardhI12 by kemonine@social.holdmybeer.solutions
2019-04-19T03:54:20.615047Z
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@ari Typical charger circuit setup from what I see online.1V is well within what I'd expect to see from fresh batteriesI also just noticed the power source was hooked up so it could be a little slop from that being presentI just turned off the power source and hopefully I'll see some drain before long