NiCad's are bad news.. They are extremely toxic, and nasty. I would not use them, Have a look at https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery much better option.
Lachlan On Thu, May 19, 2016 at 10:38 AM, William Hermans <[email protected]> wrote: > Oh and for those worried about the LiPO chemistry . . . > http://www.all-battery.com/15pcsnicdsubc2200mahrechargeablebatteryflattop-90626.aspx?utm_source=GoogleShopping&utm_medium=GDF&gdftrk=gdfV26767_a_7c354_a_7c922_a_7c90626&gclid=CJuytLPW5swCFYaTfgod0bgHeg > > Problem is, you need three, maybe four of these. But cost would be ~$6-$8. > Additionally 2200mah is a bit much if all you're going ot do is shutdown > right away. So perhaps the AA cell equivelent, and those would cost less. > SubC is the cell type typically used in cordless drill packs . . . > > On Thu, May 19, 2016 at 10:28 AM, Lachlan Audas <[email protected]> wrote: > >> It may not be out door's.. the electronics/computer's may be inside near >> a heat source, >> I having seen electronics covered up by the end user's many times. (how >> many routers have you seen under >> a pile of books.. clothing ? ..etc ) then there is fan's breaking, air >> ventilation hole's fill with dust, cat hair etc. >> it's not just out door's which may provide and nasty environment. >> The second problem is super cap's have high internal resistance, which >> limit's how much current you can pull >> from them. Problem there is problem is how much of the capacity of the >> super cap are you using ? >> a 5V super cap backing up power to a 5v to 3.3v switching reg, or liner >> reg may only give you 4.3 volts before >> the reg start's dropping the 3.3v power rail. So there may be only 0.7V >> of the super capacity you are using. >> And to get around that, you need a SEPIC switching reg, and of course >> your drawing big currents once you start drooping to 1 or 2 volts of the >> super cap. So the cost of having a Electro running at 40 or 50V, where >> you will >> get almost all of it's capacity is not a bad trade off, when you see that >> you will have even bigger problem with supper caps and extracting there >> full capacity. And you will be switch much higher currents to get your >> 3.3V's from it. >> >> Lachlan >> >> >> On Thu, May 19, 2016 at 8:33 AM, Super Twang <[email protected]> >> wrote: >> >>> @Lachlan >>> Thanks for the info Lachlan. >>> >>> Re: Supercap reliability… >>> My basic understanding is that if you design with supercaps for a >>> “Everyday” (ie not too hardcore) indoor use case, and keep them within some >>> pretty obtainable operating conditions they effectively last forever. >>> Obviously there’s some ambiguity (“everyday” “pretty obtainable”, >>> “effectively”) in the prior assertion, but... >>> >>> My particular use case — indoor temps but in a wall, 5v power — might >>> see a temp range of 15° - 35°C max I’d guess. The 70°C - 105°C you’re >>> talking about would have to be a pretty harsh/industrial environment, no? >>> >>> Does anyone (who has done it, or knows how) have a sense of how >>> straightforward it is to achieve a supercap-based system design that keeps >>> the components in a range that’d keep them healthy for “Effectively >>> forever?” ie 20k+ cycles? (better than bats) 100k+? (effectively forever) >>> Or, do the requirements we’re looking at for a basic, indoor, power system >>> really push the supercaps into the “Quickly-used-up” zone? >>> >>> Best, >>> ST >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/beagleboard/F2A9E16C-3FED-44BD-AE07-F928C1477305%40gmail.com >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/CAMkt-MvJMz8Ab_xjC6uXnGWw6maqfEWMYFbJAzO73p0msAxCnQ%40mail.gmail.com >> <https://groups.google.com/d/msgid/beagleboard/CAMkt-MvJMz8Ab_xjC6uXnGWw6maqfEWMYFbJAzO73p0msAxCnQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CALHSORqK7yJ6yEtajxN97w_%3DY3u-fMie4DT%2B3apOqrizpzBpKg%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CALHSORqK7yJ6yEtajxN97w_%3DY3u-fMie4DT%2B3apOqrizpzBpKg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAMkt-MtqPhbiybN6a%3D9gnN8fjdfGiT%3DjteZe2pN6wAc5DWPaiw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
