Two of these http://www.all-battery.com/LiFePo414500Button-topCylindrical3.2V400mAhRechargeableBattery30225.aspx?utm_source=GoogleShopping&utm_medium=GDF&gdftrk=gdfV26767_a_7c354_a_7c922_a_7c30225&gclid=CPP-mNDa5swCFU1gfgodSBUB1w
Would be good enough for around one hour up time maybe. But honestly I know nothing of lithium iron phosphate batteries. I'd be "worried" how many recharge cycles they last before turning to junk. On Thu, May 19, 2016 at 10:52 AM, William Hermans <[email protected]> wrote: > My point is, there are many different battery chemistry types. Then at > some point if you want to "play" you're going to have to "bargin with the > devil" one way or another. > > On Thu, May 19, 2016 at 10:46 AM, Lachlan Audas <[email protected]> wrote: > >> 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 >> <https://groups.google.com/d/msgid/beagleboard/CAMkt-MtqPhbiybN6a%3D9gnN8fjdfGiT%3DjteZe2pN6wAc5DWPaiw%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/CALHSORqoR75J33g7%2BNoCm6K_bE%3DxM8ByVrNuPoiT6tVkvG6LYA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
