Questions about batteries

>
> I want to run some devices on battery power, one is my bipap machine thatis 12volts and 4.6a, and the other are the ends my fiber optic cables which both are 5v and one is 2.6a and the other is 1.0a
> they.
>
> For my bipap Ive seen some high capacity SLA (sealed lead acid) batteriesthat are 12v and 40ah for 80 dollars, Ive also seen some high capacity lithium batteries but they are around 300.
>
> Can I just get an adapter that connects to the dc input of my machine andconnect the positive and negative wires to the battery? My bipap being 4.6a and the battery being 40ah means I should get around 9 hours or maybe more since the machine will probably not pull the full 4.6a most of the time, am I correct?
>
> I also noticed when looking for batteries that they almost never give theamps rating only the mah or ah which is different, so when buying a battery does one not have to worry about the amps and only match the correct volts?
>
> thanks
> -Cris
>

>
> Yeah Ill make sure to always check that, I definitely don`t want that to happen.
>
>
> Eli I imagine one would need a dropout regulator because once the batteryis low the voltage starts dropping and the lower voltages can damage a device, correct? Ill look into one for the SLA battery, if you happen to have a link for one id apprecite it , I dont think ill need one for the 5v devices since ill be buying a 5v lithium battery that has an LED gauge that willlet me know once the battery is low.
>
> I learned that one doesnt really need to know the amps because the devicewill pull the needed amps from the battery.
>
> Stewart yeah thats how I got the calculation for ~9 hours, I was wondering if those hours cold possibly be higher though since I think devices dont always pull the full amps their adapters are rated for, i wanted to know ifthis correct.
>
> How big of an electrocution hazard are these SLA batteries, and how does one get electrocuted by them? They have the positive and negative connections exposed.
> thanks
>

>
>
> Here's a low-dropout regulator from National Semi:
>
> www.national.com/analog/power
>
> This one is only good for 1 amp though. Others will go up
> to 5 amps - but at 5 amps it's gonna run hot. The dropout
> voltage is 0.5 volts, so for a 5v application you'll need
> 5.5 volts or more. A 12v lead acid battery is really 13.5
> volts or so when fully charged. You'll have to check the
> exact voltage for the lithium battery.
>
> If it is over 5 volts then you may want to regulate it.
>
> For safety make sure the terminals are insulated.
> Don't leave them exposed.
>
> How is the fiber optic working for you? Is it more
> tolerable than cable?
>
>
> Eli
>
> --- In [hidden email] <eSens%40yahoogroups.com>, "cris_aov"
> <cris_aov@...> wrote:
> >
> > Yeah Ill make sure to always check that, I definitely don`t want that to
> happen.
> >
> >
> > Eli I imagine one would need a dropout regulator because once the battery
> is low the voltage starts dropping and the lower voltages can damage a
> device, correct? Ill look into one for the SLA battery, if you happen to
> have a link for one id apprecite it , I dont think ill need one for the 5v
> devices since ill be buying a 5v lithium battery that has an LED gauge that
> will let me know once the battery is low.
> >
> > I learned that one doesnt really need to know the amps because the device
> will pull the needed amps from the battery.
> >
> > Stewart yeah thats how I got the calculation for ~9 hours, I was
> wondering if those hours cold possibly be higher though since I think
> devices dont always pull the full amps their adapters are rated for, i
> wanted to know if this correct.
> >
> > How big of an electrocution hazard are these SLA batteries, and how does
> one get electrocuted by them? They have the positive and negative
> connections exposed.
> > thanks
> >
>
>  
>

>
>
> PUK replies - 10 yrs ago after fully charging a car battery, I was fitting
> it back when the large spanner I was using slipped onto the other terminal
> and sparked, I drew back and then went to retreive the spanner, at that
> point the battery exploded in may face ! I ran into the house and dumped
> the
> entire contents of the washing up bowl over mmy head crockery and all,
> When I had a good rinse I went outside to find the whole top of the battery
>
> was blown away, and the spanner was no where to be seen ! The next day the
> waxed jacket that I had on was littered with acid burns and holes,
> certainly
> the vented car batteries are extremely volatile if you manage to ignite
> the gas !!!!
>
>
> PUK
>
>
> In a message dated 14/03/2010 16:38:15 GMT Standard Time,
> [hidden email] <jaime_schunkewitz%40yahoo.com> writes:
>
> How big of an electrocution hazard are these SLA batteries, and how does
> one get electrocuted by them? They have the positive and negative
> connections exposed.
> > thanks
> >
>
> [Non-text portions of this message have been removed]
>
>  
>

>
> Sorry for the late reply was have some medical issues and it was hard to respond,
>
>
> Eli, the fiber optics cables are excellent , Ive tried ALOT of different ways to reduce my symptoms pretty much anything that didnt cost and arm anda leg and made and made sense in the way it would reduce EMFs but I also tried a few devices like earthcalm necklace and a few other devices I cant remember the name of, nothing comes close to the amount of relief these fiber optic cables have given me. I would say its reduced my symptoms like ~60%  
>
>
> I still get some very minor symptoms but nothing close to how bad it use to be. Right now Im just doing any tweaks within my capabilities to make mycomputer system the best possible.
>
>
>
> So I ended up just buying the 5v lithium batteries for the receiving endsof my fiber optic cables, and I bought these cables to connect them to thebattereis, since the 5v output of these batteries comes as a USB output.
>
> http://cgi.ebay.com/5-5mm-Barrel-Connector-5V-DC-Power-Cable-to-USB-Male_W0QQitemZ250575375460QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a5774cc64
>
> for the DVI cable I actually ended up not even needing a battery because I found that with that cable I could just connect it to the usb input of myprojector, so I was able to eliminate the power supply and need for a bettery. I was surprised that eliminating that little power supply that powered the recieving end of my dvi fiber optic cable made a very nice and noticeable improvement, more than I had expected.
>
>
> Now Im also powering the recieving end of my usb fiber optic cable with abattery so thus my keyboard and mouse are also battery powered, this also made a nice improvement but actually less than I was expecting and had hoped for, this is probably because the keyboard and mouse emit their own fair amount of radiation that I guess is not so much related to the power supplyand also because they are so near to one.
>
>
> I decided not power my bipap machine with a battery for now, instead I want to try a linear power supply, I remember reading about these and how they are much better than regular (switching) power supplies.
>
> I have few questions and concerns about running my bipap with a switchingpower supply though
>
> 1. My bipap manual says to only to use their power supplies, would it besafe to use a linear power supply with it?
>
> 2. My bipap power supply is rated at 12v 4.16a , I found two 12v linear power supplies with 3A and 5A output on ebay, would it be safe to use a 5Aamp one with my machine?
>
> 3. Is it safe to use a linear power supply for long periods of time?
>
>
>
> thanks
> -Cris
>

>
>
> Sorry for the late reply was have some medical issues and it was hard to
> respond,
>
> Eli, the fiber optics cables are excellent , Ive tried ALOT of different
> ways to reduce my symptoms pretty much anything that didnt cost and arm and
> a leg and made and made sense in the way it would reduce EMFs but I also
> tried a few devices like earthcalm necklace and a few other devices I cant
> remember the name of, nothing comes close to the amount of relief these
> fiber optic cables have given me. I would say its reduced my symptoms like
> ~60%
>
> I still get some very minor symptoms but nothing close to how bad it use to
> be. Right now Im just doing any tweaks within my capabilities to make my
> computer system the best possible.
>
> So I ended up just buying the 5v lithium batteries for the receiving ends
> of my fiber optic cables, and I bought these cables to connect them to the
> battereis, since the 5v output of these batteries comes as a USB output.
>
>
> http://cgi.ebay.com/5-5mm-Barrel-Connector-5V-DC-Power-Cable-to-USB-Male_W0QQitemZ250575375460QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a5774cc64
>
> for the DVI cable I actually ended up not even needing a battery because I
> found that with that cable I could just connect it to the usb input of my
> projector, so I was able to eliminate the power supply and need for a
> bettery. I was surprised that eliminating that little power supply that
> powered the recieving end of my dvi fiber optic cable made a very nice and
> noticeable improvement, more than I had expected.
>
> Now Im also powering the recieving end of my usb fiber optic cable with a
> battery so thus my keyboard and mouse are also battery powered, this also
> made a nice improvement but actually less than I was expecting and had hoped
> for, this is probably because the keyboard and mouse emit their own fair
> amount of radiation that I guess is not so much related to the power supply
> and also because they are so near to one.
>
> I decided not power my bipap machine with a battery for now, instead I want
> to try a linear power supply, I remember reading about these and how they
> are much better than regular (switching) power supplies.
>
> I have few questions and concerns about running my bipap with a switching
> power supply though
>
> 1. My bipap manual says to only to use their power supplies, would it be
> safe to use a linear power supply with it?
>
> 2. My bipap power supply is rated at 12v 4.16a , I found two 12v linear
> power supplies with 3A and 5A output on ebay, would it be safe to use a 5A
> amp one with my machine?
>
> 3. Is it safe to use a linear power supply for long periods of time?
>
> thanks
> -Cris
>
>  
>

>
>
> Thanks I ended getting this one I found that outputs 4-6 amps, I know it
> doesnt say if its a linear power supply but I researched and it is and its
> also regulated. It was also only 20 bucks. I should have it in a few days.
>
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280489277064&ssPageName=STRK:MEWNX:IT
>
> I also bought a cable with a cigarette lighter input for it, it has 5 amp
> fuse.
>
> The bipap machine is about 7-8 feet away from me so it shouldnt be a
> problem, Ive found that the magnetic fields are not really that bad anyway,
> not that they dont affect me or anything but its really these nasty RF
> fields that cause the majority of our (or at least my) symptoms.
>
> Bill, thanks for mentioning the linear power supply that uses a toroidal
> transaformer, Thats fantastic a power supply which emits almost no EMFs! I
> found one on ebay which was on auction it went for 140 though.
>
> For the moment I just want to see for myself how much of a difference this
> linear power supply will make, if I like it I will probably then try (hunt)
> a torroidal linear power supply and eventually run my bipap,projector, and
> computer off them. I plan on getting a small pc type computer that has an
> aluminum case and use a linear power supply to run it
>
> Bill just wondering why is a regulated power supply better EMF wise, I
> would assume the extra circuit or components would increase the EMFs
> somewhat, is it because since its regulated it will control the output
> better voltage so the power supply works less thus lowering the magnetic
> field, or something like that?
>
> I will do a guide to USB and DVI fiber optic cable guide in the following
> weeks, Ive been wanting to do one but have kept putting it off but Ill make
> sure to do it either this week or next.
>
> -Cris
>
>  
>