Batteries In Parallel To Increase Playtime?

[QuasaR]

How is it possible to get these bulky batteries in the system then?

So, how will you get the 4 or 6 AAs into the system? Just the same lunatic idea...

 

[Fishbong]

I was just thinking that myself. Basically each battery has a diode leading to the + terminal. If all the batteries in Parallel have a diode there, it should stop any reverse leakage. In theory you could have 100 batteries in parallel, but the potential for high current increases! This may be particularly important to overclockers, you may be able to overclock higher, BUT the risk of damaging the device increases with each pair in parallel.

So true.
That´s why its best to put them in series and use a stepdown converter chip like i did. I used a LM2576 chip to solder a small, adjustable stepdown converter for Batteries. Since its adjustable, i can also hook up my PSP and Archos Gmini to it. Just gotta change the plug.

 

[Gadget]

Has anyone else ever wondered why battery cells aren't square? If they were square ended instead of round, you would have 20 - 30% more battery capacity, in what ends up being the same space?

Sorry to go off topic :rolleyes:

 

[paeryn]

Has anyone else ever wondered why battery cells aren't square? If they were square ended instead of round, you would have 20 - 30% more battery capacity, in what ends up being the same space?

Sorry to go off topic :rolleyes:

Because traditionally batteries were made like this.
And you need constant distances between each part for efficiency, this can only be done with cylindrical shapes.
If you try using any other shape then you'll end up with corners and edges conducting more electrons than the flat areas.
Rechargables are made in layers and don't need to cylindrical for efficiency, that's why you can get prismatic ones more readily. However since the main demand is for batteries that fit in older equipment the cost of prismatics is higher. Mobile phones, laptops, ipods etc. all use custom-made prismatics, that's why they're so expensive to replace.
(All theories above are guesswork and may not be true, but make sense to me.)

 

[ste_167]

Has anyone else ever wondered why battery cells aren't square? If they were square ended instead of round, you would have 20 - 30% more battery capacity, in what ends up being the same space?

Sorry to go off topic rolleyes.gif

Because traditionally batteries were made like this.
And you need constant distances between each part for efficiency, this can only be done with cylindrical shapes.
If you try using any other shape then you'll end up with corners and edges conducting more electrons than the flat areas.
Rechargables are made in layers and don't need to cylindrical for efficiency, that's why you can get prismatic ones more readily. However since the main demand is for batteries that fit in older equipment the cost of prismatics is higher. Mobile phones, laptops, ipods etc. all use custom-made prismatics, that's why they're so expensive to replace.
(All theories above are guesswork and may not be true, but make sense to me.)

and what's more, they'd be a bugger to prise into your gp2x

 

[nubie]

My thoughts are - if we connected an external (home made) battery pack, made up of 6 batteries, (two sets of three battery sets in parallel), this would appear to keep the same voltage as we currently get, but could, in theory, give us 3x the play life between recharging, so we could get about 15 hours on 6 batteries (or whatever multiplier of battery packs you want to use) - maybe more, as the combined power of 3x 2600Nimh batteries would be very high, whilst still maintaining the same voltage of a single battery.

I don't know if this would work in practice, perhaps someone could enlighten?

I know this would mean an external battery pack, but it is still a better option than the power mains adaptor (which gets in the way of the GP2x buttons). The battery contacts could be easily soldered to the existing GP2x battery contacts, on the underside of the GP2x.

Hello, I am glad you are thinking bacteria .

But you do not want to use a set of batteries in parallel, it will drain some more than others, setting up crossflows of amperage that are potentially highly dangerous (exploding, chemical spray, etc)

Use 2 D size at 9000mah apiece, it will be the power of about 4 sets of AA size and is much easier to manage.

try a google of "9000mah D", I found this link that way:
http://shopping.microbattery.com/s.nl/sc.2...mbcat.rechg5/.f

It has some 7000mah GP brand NiMH for a good price, alternatively if you could live with double power look up a C size 5000mah rechargable.

This thread comes around every few months, with nobody ever learning anything, please do not use multi-AA battery packs, it is beyond foolish.

Besides chemicals and exploding there is the fact if you go C or D cell that you will be charging a single set of batteries per usage, I would not want to be the guy who needs to charge 6 AA just to play for an extended period of time, it seems highly goofy to me.

Think about what I said, I have electronics training you know, I would try getting the C-cells built into an alternative back case if I were you, something like replacing the battery bulge there now with a C size one, that would be fine by me, it would still fit in my coat pocket just fine, and who can argue with double run-time .

 

[nubie]

Why not using Monos instead of Mignons... I've seen some with over 5000mAh => resulting in 10000mAh with just 2 batteries...

Oh My God!! Please say you are not serious!!

It makes 10,000mah at the voltage of the original cells (1.2v) in parallel)

It would make only 5,000mah at the SERIES voltage (2.4v) we are interested in.

Please go read a book or a wiki on what parallel/series/amperage/voltage are and how they relate to each other.

Sum up:
Parallel doubles AMPS, volts stay the same.

Series doubles VOLTS, amps are the same.

Edit: What did I say above about nobody learning anything?

 

[Fishbong]

It´s depressing, ain´t it?

Those kids talk about stuff that´s soo simple and yet they get half of it wrong. I bet they don´t even know Ohm´s law ...

Seriously, what do these kids learn at school nowadays ?

 

[BlackDayz]

It´s depressing, ain´t it?

Those kids talk about stuff that´s soo simple and yet they get half of it wrong. I bet they don´t even know Ohm´s law ...

Seriously, what do these kids learn at school nowadays ?

Ohm's law = E = IR
Watt's Law = P = IE

Now how does everyone remember there resistor color codes?

** EDIT **
And I just remembered where I saw Fishbong's avatar. The forklift video. That is classic.

 

[lintsniffer]

Bad Boys Ravish Only Young Girls But Violet Gives Willingly

yeah...

 

[PSyMastR]

Bad Boys Ravish Only Young Girls But Violet Gives Willingly

yeah...

ROFL. I got to remember that.

 

[lintsniffer]

Bad Boys Ravish Only Young Girls But Violet Gives Willingly

yeah...

ROFL. I got to remember that.

yeah thats the whole point, it's a mnemonic.

 

[OMars]

How is it possible to get these bulky batteries in the system then?

Buy one of the holding cell things (like the ones shown on page 1 of this thread), and connect the + and - directly into the battery contacts in the GP2X, or into the power in socket.

You could have a 'box' that you can just plug into your GP2X and get many more hours of power. As I said earlier though, the maximum current available to the GP2X could cause problems if you are overclocking and the CPU(s) go into a lock / crash situation from excessive heat etc. At that point they could drain a LOT more current than normal, and with standard batteries that might not be a problem, but when there is a possibility of LOADS more current than normally possible through the battery connectors, you could damage something.

Personally I would think about adding a fuse inbetween the high power batteries and the GP2X, but someone needs to work out what a good size fuse would be in mA. ie. at 200Mhz, or under extreme load at 275 - 300 Mhz.

Has anyone checked the sort of current that the device uses under normal / overclock?


EDIT: http://www.all-battery.com/index.asp?PageA...PROD&ProdID=568

Why not put two of these in a series set up in an external case? :huh: It would last a friggin' week!!!!!

 

[nubie]

EDIT: http://www.all-battery.com/index.asp?PageA...PROD&ProdID=568

Why not put two of these in a series set up in an external case? :huh: It would last a friggin' week!!!!!

Been mentioned about 20 times in 4-7 different threads that is why.

Yes yes, why not indeed, I myself am going to get a small nuclear reactor and power my GP2X and submarine off it for 20 years, because it is a bad idea thats why.

I don't know if you can play for a week straight, that seems like a twisted experiment to me.

It would be ungodly unportable, I would realistically be using the double power afforded by C cells at 5000mAh for 8 hours of play.

And likely design a power circuit to let me swap batteries with the GP2X still running, I would need to take a break every 8 hours anyway, how the hell can you play it 8 hours straight anyway?