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| 17:04.31 | 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 |
| 17:05.16 | arossdotme | its got an thermistor |
| 17:07.38 | 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 |
| 17:07.39 | arossdotme | sid=eab159c2-6860-492f-81c2-340fa406b7ff |
| 17:37.23 | roh | i'd recommend using lifepo btw... |
| 17:42.34 | 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 |
| 17:53.07 | whitequark | already suggested lifepo to him |
| 17:53.10 | whitequark | too expensive apparently |
| 17:58.47 | 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 |
| 17:59.07 | whitequark | interesting |
| 17:59.13 | whitequark | btw roh, i had an idea recently |
| 17:59.27 | whitequark | as you well know li-ion/poly is prohibited on planes in certain configurations |
| 17:59.47 | whitequark | i haven't found anything that prevents me from bringing a 200Wh lifepo4 external battery on an intl flight |
| 18:07.59 | arossdotme | oh drat didnt think about winter |
| 18:08.18 | arossdotme | err lots of bubble rap to keep it warm? |
| 18:09.49 | arossdotme | roh, i hear you and i put bat life time and quality into my considerations. |
| 18:10.32 | arossdotme | so for example. i only want usb power banks with those really high mah Panasonic cells |
| 18:10.49 | arossdotme | posted a link for a bank that used them yesterday |
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| 18:14.32 | 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 |
| 18:15.33 | arossdotme | the problem with lifepo cells i think was finding somewhere to buy them from |
| 18:15.40 | arossdotme | got any links? |
| 18:16.38 | arossdotme | roh, ^ |
| 18:18.16 | whitequark | ebay.com |
| 18:18.39 | 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 |
| 18:19.15 | DocScrutinizer05 | LiFePo has a vastly different cell voltage |
| 18:19.19 | arossdotme | whitequark, i dont normally search ebay, ill have a look |
| 18:19.30 | DocScrutinizer05 | only 3.2 to 3.3V |
| 18:19.42 | arossdotme | DocScrutinizer05, yep. not so high... oh ok so not much diff |
| 18:19.57 | DocScrutinizer05 | o.O ??? |
| 18:20.35 | DocScrutinizer05 | you can't use any LiIon standard stuff for LiFePo. Neither chargers nor balancers nor any other stuff |
| 18:20.58 | 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 |
| 18:21.28 | DocScrutinizer05 | it's a whole 1 volt diff |
| 18:21.47 | arossdotme | doh |
| 18:21.49 | DocScrutinizer05 | try to charge a LiFePo to 4.2V and watch it go dead |
| 18:23.59 | 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 ;) |
| 18:24.52 | arossdotme | sorry thx |
| 18:26.24 | 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) |
| 18:30.01 | DocScrutinizer05 | invariably you need a special LiFePO4 charger and balancer/protector circuit |
| 18:30.42 | whitequark | chargers often support multiple standards |
| 18:30.50 | whitequark | i have a charger thats liion/nimh/lifepo4 |
| 18:30.53 | whitequark | for 18650s |
| 18:31.01 | DocScrutinizer05 | well, depends |
| 18:31.16 | DocScrutinizer05 | you need one that explicitly does |
| 18:32.31 | DocScrutinizer05 | charfing a LiFePO4 in a LiCoO2 charger is a sure bet for disaster |
| 18:33.05 | DocScrutinizer05 | LiFePO4 is less likely to catch fire and explode, but it's not impossible |
| 18:34.05 | enyc | I didnot' know 18650's came in form of NiMhs -- woul think that would be worng voltage for whats expected in that size |
| 18:35.38 | DocScrutinizer05 | a smart charger could distinguish cell chemistry by (delta-)V/t observing |
| 18:36.54 | DocScrutinizer05 | a LiFePO4 will stay at ~3.3V for quite a while, then suddenly sharp rise to 3.6V |
| 18:37.56 | DocScrutinizer05 | a LiCoO2 should stay at 3.6 to 3.9V and then less sharp rise to 4.2V |
| 18:41.00 | arossdotme | is LiCoO2 the old li-ion that had a norm of 3.6V? |
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| 21:33.13 | qi-bot | [commit] Stefan Schmidt: flashi/spi: Use tabs instead of spaces. (master) http://qi-hw.com/p/ben-wpan/15b15b9 |
| 21:33.14 | 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 |
| 21:33.15 | 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 |
| 21:33.17 | 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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