#qi-hardware IRC log for Sunday, 2016-01-17

qi-bot[commit] Werner Almesberger: components/tvs8.lib: 8 x diode TVS (master) http://qi-hw.com/p/kicad-libs/2b8272416:02
qi-bot[commit] Werner Almesberger: xxx (master) http://qi-hw.com/p/kicad-libs/370243c16:02
qi-bot[commit] Werner Almesberger: components/README: add HIERARCHY step (master) http://qi-hw.com/p/kicad-libs/e720f0916:02
qi-bot[commit] Werner Almesberger: modules/dfn.fpd: add DFN-8-0.4mm (master) http://qi-hw.com/p/kicad-libs/b8cf94216:02
arossdotme-planbre my 15A fused amp. with it in briged mode so instead of 4x45w its doing 2x90w into 100w 8ohm speakers. playing some music it was on average comsuming below 4A (3.6) but maxed out more and with strongy bassy music it was hovering around 4,5,6A. i think the 15A fuse is so the fuse doesnt blow duing little high peaks but i think(?) if i used 4ohm speakers it would have consumed more amps then. so i believe a 10c s4 (14.8v) batt 17:11
arossdotme-planbwould do for this amp. unless i need to leave more head room.... hmm17:11
arossdotme-planbmy bad the C (discharge) rating is $discharge_rating * $mAH_number17:40
arossdotme-planbso with a 10C 16AH pack thats plenty of an discharge rating :D. boy RC stuff needs lots of amps when they using 50C + 10Aetc packs 17:42
rohdont use rc stuff. bad quality regardless of vendor and shitty quality.21:02
rohalso wears down fast. not compareable with any sane battery technology.21:02
rohthis stuff is built for single-digit charge/discharge cycles and no proper safetey. nothing one could compare with stuff on the level of car-batteries or whats in your computer21:03
arossdotme-planbroh, oh no arrrrrrrrrrrrrrrr22:30
arossdotme-planbback to square one22:30
arossdotme-planbnot even if i dont over discharge them but only dischage them to 3.5v so they last longer?22:31
arossdotme-planbroh,  are lower discharge rate, designed for high mAH rc batts. not any better than rc batts designed for high discharge rate over mAH?22:34
arossdotme-planbim really better off getting 18650 cells are manually wiring them up to a 4s4p pack? hopping that the cells are from the same batch, etc?22:37
whitequarkdon't hope, use protected cells22:38
whitequarkyour house, which will not get on fire, will thank you22:38
whitequarkask DocScrutinizer51 about not using protected li-ion cells :p22:38
whitequarkor alternatively use LiFePO4, these are mre expensive and lower capacity22:39
whitequarkbut they do not have the runaway reaction22:39
whitequarkthey *do* catch fire but you have to try pretty hard. LiFePO4 doesn't even have any restrictions for bringing them on airplanes22:39
whitequarklike NiMH, NiCd and others don't22:40
roharossdotme-planb: rc stuff is not built for reliability or normal (high) charge/discharge cycles afaik.22:42
arossdotme-planbarr dam it22:44
arossdotme-planbi know about fire risks. but proving i stay within the safe voltage rang i should be ok. oh and add a good about of drop protechion so the rc pack cells dont get damaged as ive read thats a problem. something not too insulating get will protect.. hmm a wrap of something or a box with foam tails to sandwich the batt in the box ?22:46
arossdotme-planbi thought it would be safer then the risk of the batts not matching in a diy pack. to buy a pack already made up. not built for reliability of dis/charge cycles would be a big problem :|22:48
arossdotme-planbwhat about the novena laptop? that used rc packs?22:49
arossdotme-planbphone batts come in a metel casing? jugging by this picture http://www.instructables.com/id/Make-A-Cheap-Lithium-Battery-Pack/22:51
arossdotme-planbthe comments in that article are interesting about panevilonic scam with plasm screens22:54
DocScrutinizer05all batteries have a metal case. That's system immanent since the cell needs two metallic anodes23:12
DocScrutinizer05even LiPo have a 'metallic' outer 'case', though often made of thin metal foil23:12
whitequarkthat's true but I don't understand what are you responding to23:14
DocScrutinizer05whitequark: hm?  >><arossdotme-planb> phone batts come in a metel casing?<<23:30
arossdotme-planbDocScrutinizer05, sry i meant a thick metel case that could take a few knocks23:30
DocScrutinizer05depends, most do23:30
DocScrutinizer05LiPo rarely do however23:30
arossdotme-planbwheres if a foil pouchs of big rc packs get damaged/crushed when dropped23:31
DocScrutinizer05please rephrase23:31
arossdotme-planb*wheres when no if23:31
DocScrutinizer05o.O .oO(???)23:32
arossdotme-planbunlike a foil pouch of big rc packs. they get damaged/crushed when dropped23:32
arossdotme-planbthey, meaning the foil pouches23:32
DocScrutinizer05foil pouch means LiPo. LiPo are a tiny bit "flexible"23:32
arossdotme-planbpolymer because they are made using plastic wrap instead of hard casing in-between the layers23:34
arossdotme-planbot:nice laptop case http://makezine.com/2016/01/15/electronics-that-last-how-i-built-an-heirloom-laptop/23:34
DocScrutinizer05>>Originally, "lithium polymer" represented a developing technology using a polymer electrolyte instead of the more common liquid electrolyte. The result is a "plastic" cell, which theoretically could be thin, flexible, and manufactured in different shapes, without risk of electrolyte leakage.<< https://en.wikipedia.org/wiki/Lithium_polymer_battery23:35
DocScrutinizer05>>The second meaning appeared after some manufacturers applied the "polymer" designation to lithium-ion cells contained in a non-rigid pouch format. <<23:36
DocScrutinizer05really WTF!  https://en.wikipedia.org/wiki/Lithium_polymer_battery#Lithium_cells_with_true_polymer_electrolyte23:38
Action: DocScrutinizer05 wasn't aware idiots another time corrupted and perverted a perfectly clear and precise term23:41
DocScrutinizer05other instances: "flat rate", "non deadly weapon", "peace mission"...23:42
arossdotme-planburrgh annoying that it means 2 things23:50
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