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2016-03-17 17:04 <arossdotme> this is an interested BMS http://www.aliexpress.com/item/FMA-Balance-BMS-PCM-for-4S-14-8V-Li-ion-Li-Po-Battery-C-20A-Temp/32630267805.html?ws_ab_test=searchweb201556_9,searchweb201602_2_10034_507_10032_10020_10001_10002_10017_10010_10005_2020019_10011_10006_10003_10021_10004_10022_10009_10008_10018_10019,searchweb201603_8&btsid=b219447d-4b95-4dbd-8162-3fe682639313
2016-03-17 17:05 <arossdotme> its got an thermistor
2016-03-17 17:07 <arossdotme> or this one, a one i prev linked to, looks like it also has connections for a thermistor but doesnt include one: http://www.aliexpress.com/item/4S-14-8V-16-8V-Lithium-Battery-Protection-Board-20A-BMS-PCM-for-18650-Lithium-Batteries/32611828360.html?ws_ab_test=searchweb201556_9,searchweb201602_2_505_506_503_504_10034_10020_502_10001_10002_10017_10010_10005_10006_10011_10003_10021_10004_10022_10009_10008_10018_10019,searchweb201603_8&bt
2016-03-17 17:07 <arossdotme> sid=eab159c2-6860-492f-81c2-340fa406b7ff
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2016-03-17 17:37 <roh> i'd recommend using lifepo btw...
2016-03-17 17:42 <roh> simply because they deal much better with physical safety and low temperatures. classic li-ion/li-po may be a notch better in energy density, but they are both exotherm and cannot handle winter
2016-03-17 17:53 <whitequark> already suggested lifepo to him
2016-03-17 17:53 <whitequark> too expensive apparently
2016-03-17 17:58 <roh> well.. i use that stuff in packsizes up to 423 or 530Wh for some time now.. and can say for sure that as long as you want to use mobile/outdoor for more than a few minutes, one needs proper batteries anyhow. what sense does cheaping out 10% bring when the pack dies after a year
2016-03-17 17:59 <whitequark> interesting
2016-03-17 17:59 <whitequark> btw roh, i had an idea recently
2016-03-17 17:59 <whitequark> as you well know li-ion/poly is prohibited on planes in certain configurations
2016-03-17 17:59 <whitequark> i haven't found anything that prevents me from bringing a 200Wh lifepo4 external battery on an intl flight
2016-03-17 18:07 <arossdotme> oh drat didnt think about winter
2016-03-17 18:08 <arossdotme> err lots of bubble rap to keep it warm?
2016-03-17 18:09 <arossdotme> roh, i hear you and i put bat life time and quality into my considerations.
2016-03-17 18:10 <arossdotme> so for example. i only want usb power banks with those really high mah Panasonic cells
2016-03-17 18:10 <arossdotme> posted a link for a bank that used them yesterday
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2016-03-17 18:14 <arossdotme> i was planning on making a big pack my self but then this discount huge rc pack came along from hobbyking and well, my thinking was ill try and see. i dont expect the mah to be what it was, but it sounds like that they dont lose there mah that quickily according to DocScrutinizer05. so goodie. i hope that if i look after it, like only discharging it to 3.5v and not storging it fully charged ill make it last its 500 cycles
2016-03-17 18:15 <arossdotme> the problem with lifepo cells i think was finding somewhere to buy them from
2016-03-17 18:15 <arossdotme> got any links?
2016-03-17 18:16 <arossdotme> roh, ^
2016-03-17 18:18 <whitequark> ebay.com
2016-03-17 18:18 <arossdotme> btw this monitors are brill! wise there was a version with a huge display and a much bigger time remaining countdown? http://www.aliexpress.com/item/80V-50A-Coulomb-gauge-electrical-parameters-lithium-battery-LCD-display-instrument-TF01N/32232092752.html
2016-03-17 18:19 <DocScrutinizer05> LiFePo has a vastly different cell voltage
2016-03-17 18:19 <arossdotme> whitequark, i dont normally search ebay, ill have a look
2016-03-17 18:19 <DocScrutinizer05> only 3.2 to 3.3V
2016-03-17 18:19 <arossdotme> DocScrutinizer05, yep. not so high... oh ok so not much diff
2016-03-17 18:19 <DocScrutinizer05> o.O ???
2016-03-17 18:20 <DocScrutinizer05> you can't use any LiIon standard stuff for LiFePo. Neither chargers nor balancers nor any other stuff
2016-03-17 18:20 <arossdotme> i was typeing a reply... then you posted numbers so i added a extra sentence to indicate that i thought the voltage diff was bigger that it was. thx
2016-03-17 18:21 <DocScrutinizer05> it's a whole 1 volt diff
2016-03-17 18:21 <arossdotme> doh
2016-03-17 18:21 <DocScrutinizer05> try to charge a LiFePo to 4.2V and watch it go dead
2016-03-17 18:23 <arossdotme> oh lifepo 3.2 to 3.3v cus li-ion is 4.2, 3.7 norm. arrgh im confusing my self. 3.this 3.that 333333333 o.0  ;)
2016-03-17 18:24 <arossdotme> sorry thx
2016-03-17 18:26 <DocScrutinizer05> well, the end charge voltage is around 3.6 to 3.65V, so it's 'only' a 0.6V difference to LiCoO2 (standard LiIon)
2016-03-17 18:30 <DocScrutinizer05> invariably you need a special LiFePO4 charger and balancer/protector circuit
2016-03-17 18:30 <whitequark> chargers often support multiple standards
2016-03-17 18:30 <whitequark> i have a charger thats liion/nimh/lifepo4
2016-03-17 18:30 <whitequark> for 18650s
2016-03-17 18:31 <DocScrutinizer05> well, depends
2016-03-17 18:31 <DocScrutinizer05> you need one that explicitly does
2016-03-17 18:32 <DocScrutinizer05> charfing a LiFePO4 in a LiCoO2 charger is a sure bet for disaster
2016-03-17 18:33 <DocScrutinizer05> LiFePO4 is less likely to catch fire and explode, but it's not impossible
2016-03-17 18:34 <enyc> I didnot' know 18650's came in form of NiMhs  -- woul think that would be worng voltage for whats expected in that size
2016-03-17 18:35 <DocScrutinizer05> a smart charger could distinguish cell chemistry by (delta-)V/t observing
2016-03-17 18:36 <DocScrutinizer05> a LiFePO4 will stay at ~3.3V for quite a while, then suddenly sharp rise to 3.6V
2016-03-17 18:37 <DocScrutinizer05> a LiCoO2 should stay at 3.6 to 3.9V and then less sharp rise to 4.2V
2016-03-17 18:41 <arossdotme> is LiCoO2 the old li-ion that had a norm of 3.6V?
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2016-03-17 21:33 <qi-bot> [commit] Stefan Schmidt: flashi/spi: Use tabs instead of spaces. (master) http://qi-hw.com/p/ben-wpan/15b15b9
2016-03-17 21:33 <qi-bot> [commit] Stefan Schmidt: atusb-eui64: add utility to read/write and EUI64 from/to the device EEPROM (master) http://qi-hw.com/p/ben-wpan/55de8c6
2016-03-17 21:33 <qi-bot> [commit] Stefan Schmidt: atusb/fw: add EUI64 read and write fw interface to permanently set an EUI64 (master) http://qi-hw.com/p/ben-wpan/583a7b7
2016-03-17 21:33 <qi-bot> [commit] Stefan Schmidt: atusb/fw: Bump version to 0.3 after adding EUI64 read/write handling (master) http://qi-hw.com/p/ben-wpan/fde38d5
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