Read and you will be supersized how good they are! Lachlan
On Thu, May 19, 2016 at 10:57 AM, William Hermans <[email protected]> wrote: > 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 > <https://groups.google.com/d/msgid/beagleboard/CALHSORqoR75J33g7%2BNoCm6K_bE%3DxM8ByVrNuPoiT6tVkvG6LYA%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-Mut%3DAF%2BETR%2Bnubr7jAtQatAaxy1_ZU_mehrd6xhZDyT5A%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
