#qi-hardware IRC log for Friday, 2016-01-15

arossdotme-planbwhitequark, this site is popular on a  mountain bike forum but is $8.99 for protected and $4.59 unprotected inc worldwide shipping too good to be true/ =fake? http://www.kaidomain.com/product/details.S02411001:31
arossdotme-planbkyak, thx01:37
kyakarossdotme-planb: np04:35
DocScrutinizer05arossdotme-planb: http://eu.nkon.nl/panasonic-ncr18650b-made-in-japan.html?gclid=CKr8iaLOq8oCFYOfGwodkdoP4w  seems legit normal price10:32
DocScrutinizer05""NKON is settled in the Netherlands.""10:33
DocScrutinizer05the cheaper ones are only 2.6Ah but more Ah/buck10:38
arossdotme-planbor kyak was accidental tab auto complete was meant to be k thanks whitequark :)10:40
arossdotme-planbthx DocScrutinizer05 10:41
DocScrutinizer05""Buy 540 times for ¬3.29 "" ;-)10:42
DocScrutinizer05arossdotme-planb: anyway what for do you need those cells? You always need to choose on the tradeoff between high current/power (Ampere, Watt) cell and high capacity/mAh cell11:00
DocScrutinizer05those above are high capacity cells with only 2C (max 6A) discharge11:01
DocScrutinizer05for RC etc you can get 10C or even 30C cells11:03
DocScrutinizer05those have less chemistry for energy storing and more metal in the electrodes for high current11:04
arossdotme-planbthe Panasonic ones i was thinking for a light usb power bank to go with my gta04 and my other use was a 14.8v min batt pack for powering  power audio amps class-d 2x45w out (19-24V*3A in) and 150w into 8ohm amps too,   and netbook laptop11:04
arossdotme-planb*lighter weight11:04
arossdotme-planbmy car 14v 4x45w class d amp has a 15amp fuse....11:06
DocScrutinizer055S2P, 10 cells, should do11:06
DocScrutinizer05wait, "... other use was a 14.8v min batt pack..."   " (19-24V*3A in)"  ??11:10
DocScrutinizer055S2P can deliver 18V * 2C * 2(parallel)11:12
DocScrutinizer05at that rate, the pack is depleted after nominal 30 minutes, RL 15 minutes11:13
DocScrutinizer05never forget about balancing for Series packs!11:16
DocScrutinizer05both during charging and for monitoring discharge end voltage11:17
arossdotme-planbDocScrutinizer05, yea, beening wondering about blancing. i have a rc charger to take care of that but i wonder when building diy packs using batts from the same order (say from nkon) will they be the same batch or from differant batches? do i need to monitor indevidual cells or will it be ok to put sets in parallel (and hope for the best)?18:24
arossdotme-planbfor discharging i have a rc batt monitor/alarm that shows each cell pack voltage and sounds an alarm when one cell set is out of balance.18:25
arossdotme-planbi hope/guess theres less risk using the Panasonic 3400mah cells as i would need less of them.18:27
whitequarkget protected cells, then you don't have to care when discharging18:27
whitequarkas the protection circuit will disconnect any cell with undervoltage condition18:28
arossdotme-planbnkon looks like the best place to buy from and ship to uk. as uk places ive found so far are over priced considerably18:28
arossdotme-planbwhitequark, oh yea, your right. hu i was looking at the protected ones available at nkon18:29
arossdotme-planbdouble the price though18:29
arossdotme-planbbetter than death :)18:29
whitequarkthey're still very cheap18:30
arossdotme-planbbattery holders https://www.thingiverse.com/thing:456900/#comments18:31
arossdotme-planbthe better diy usb pwr banks have cell monitoring http://www.gearbest.com/chargers/pp_246290.html18:32
whitequarkha, that holder design is pretty great18:39
arossdotme-planbyea it is18:59
arossdotme-planbant tried it.... but looks good19:00
arossdotme-planbmy bad, nkon are 3x the price for protected. china was 2x19:00
arossdotme-planbmaybe i can find a nice protection board for less money that will do the same job19:02
arossdotme-planbDocScrutinizer05, 14.8v is the min votage pack im thinking of doing i might add an extra cell set to get 18.4v undecided19:07
arossdotme-planb(19-24V*3A in)=power input for my smaller power audio amplifier19:07
arossdotme-planbjust read up on S and P. yea 5S2P or 4S2P im think. maybe upto 4P :D depending on cost23:26
arossdotme-planbwondering about rc packs again23:33
arossdotme-planbwhile 6c i think will be enough for most things for somethings 12C or more probably would be better23:33
arossdotme-planbbwt i found with audio power amps there current consumption depends on what music your playing. most of the time its only using 1,2,3 amps at least with my 2x45w amp. i think its similar for the 4x45w 12v-in one23:34
arossdotme-planbso if its really bassy music 23:34
arossdotme-planbit needs lots of current23:34
arossdotme-planbso the actual run times are longer than you might think as most of the time the 4xspk amp is well below 15amps23:35
--- Sat Jan 16 201600:00

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