n64 batttery question

Theoretically, yes you could. Practically, absolutely not -

An average battery in a portable, we'll say, is about 4Ah at 7.4V. That gives us 26.9Wh at 7.4V. The screen uses a linear regulator and the n64 5v line does, too, so we'll roughly estimate that as 300mAh draw on the direct power line. The 3.3v line draws roughly 1.5Ah with the expansion pak, but since you can only get about 90% efficiency with the regulator, it's equal to drawing 1A from the main line, very roughly.

That's a total draw of 1.3Ah (or so, not exact) at 7.4V, meaning that 4Ah battery will last about 3 hours.

4Ah = 4000mAh. A single 9V battery is usually about 150mAh, and for simplicities sake, we'll say it costs $1. That means for $1, for one 9V battery, you can play on your portable for roughly 1/10 of an hour, or 6 minutes. However, 9V batteries aren't good at providing that much current all at once, so a lot is dissipated as heat. Drawing at 1.3Ah, you'd be lucky to get 3 minutes of play time before the battery simply gave out. That means that you're paying between $10-$20/hour to play an n64 off of 9V batteries (depending on how you wire them (in parallel, or 1 at a time)).

TL;DR

No.
 
Snipeye said:
Theoretically, yes you could. Practically, absolutely not -

An average battery in a portable, we'll say, is about 4Ah at 7.4V. That gives us 26.9Wh at 7.4V. The screen uses a linear regulator and the n64 5v line does, too, so we'll roughly estimate that as 300mAh draw on the direct power line. The 3.3v line draws roughly 1.5Ah with the expansion pak, but since you can only get about 90% efficiency with the regulator, it's equal to drawing 1A from the main line, very roughly.

That's a total draw of 1.3Ah (or so, not exact) at 7.4V, meaning that 4Ah battery will last about 3 hours.

4Ah = 4000mAh. A single 9V battery is usually about 150mAh, and for simplicities sake, we'll say it costs $1. That means for $1, for one 9V battery, you can play on your portable for roughly 1/10 of an hour, or 6 minutes. However, 9V batteries aren't good at providing that much current all at once, so a lot is dissipated as heat. Drawing at 1.3Ah, you'd be lucky to get 3 minutes of play time before the battery simply gave out. That means that you're paying between $10-$20/hour to play an n64 off of 9V batteries (depending on how you wire them (in parallel, or 1 at a time)).

TL;DR

No.
Click to expand...
I like this guy.
 
so i couldn't really do it :cry4: well how could i use replacible batterys if i wanted to becuase my friend loses every charger he gets
 
Replaceable batteries for ANY portable are a bad idea.

If you used 12 AA's, you could get about 3 hours of playtime, MAYBE, but that's 12 AA's EVERY SINGLE TIME you want to get 3 hours. If you wanted to use rechargeable AA's instead, you'd need 14-16 for the same play time, and charging that many is a pain. I'd suggest bondo-ing the charger to his wall, so he CAN'T lose it.

budnespid said:
I like this guy.
Click to expand...

Why, thank you.
 
yeah but that would take up some room if i had a built in charger and for bond-oing his charger to the wall well let's just say his mom would kill me :gonk:
 
OK, if you used 6 D (alkaline) batteries, you could get 12Ah, which would theoretically run the portable for 9 hours, though due to internal resistance I doubt the batteries would actually last that long. It would also add a CRAPLOAD of volume to your portable, along with 2.3lbs of battery weight. If you used 2, you might be able to find an expensive step-up circuit that would bring the voltage to the required level, but there's still the matter of cost. Looking online, D batteries are also about $1, meaning that you're paying 2/3 of $1 every time you play it for just one hour, and people rarely play a game for just 1 hour. If you play it for say, 6 hours, you pay $4. That's actually pretty reasonable, but you're only using 2/3 of the potential time - if you set it down and don't use it for a while, the batteries could very well get drained by quiescent current draw.

If you absolutely have no freaking other option, D batteries are your best bet unless you want to lug a car battery around everywhere you go, but I would still advice against anything other than Lithium-based batteries because of the required weight and space. You could hold on to the battery charge if you absolutely have to, and lend it to him when he has to charge.
 
i got about 25 d batterys so that would work out i guess I'll just give him about 12 of them so this will probably work out i let you guys how it does
but if anyone does have a better way with less batterys then let me know
 
Snipeye said:
OK, if you used 6 D (alkaline) batteries, you could get 12Ah, which would theoretically run the portable for 9 hours, though due to internal resistance I doubt the batteries would actually last that long. It would also add a CRAPLOAD of volume to your portable, along with 2.3lbs of battery weight. If you used 2, you might be able to find an expensive step-up circuit that would bring the voltage to the required level, but there's still the matter of cost. Looking online, D batteries are also about $1, meaning that you're paying 2/3 of $1 every time you play it for just one hour, and people rarely play a game for just 1 hour. If you play it for say, 6 hours, you pay $4. That's actually pretty reasonable, but you're only using 2/3 of the potential time - if you set it down and don't use it for a while, the batteries could very well get drained by quiescent current draw.

If you absolutely have no freaking other option, D batteries are your best bet unless you want to lug a car battery around everywhere you go, but I would still advice against anything other than Lithium-based batteries because of the required weight and space. You could hold on to the battery charge if you absolutely have to, and lend it to him when he has to charge.
Click to expand...

If what snipeye said about the N64's current draw in his first post is true, this can be done with 2 D cells wired in parallel. You will need to step up the Standard D cell is about 1.5v 13AH. You will need to step up to about 3v and about 7.5v. Stepping up essentially lowers the capacity of the battery. You will need to step 1.5v up to 3v, doubling the voltage, doubling the current draw on that line. So if the 3v line pulls 1500mah normally, it will now pull 3000mah. Next we will need to step 1.5v to 7.5v. This multiplies the voltage by 5, thus multiplying the current draw by 5. If the 7.5v line originally drew 300mah, it will now pull 1500mah. 3000mah+15000mah=4500mah. 26000/4500=5.7777 or about 6 hours. Not counting this internal resistance stuff.
 
So we have no numbers at all? I can't imagine that the audio amp, all the chips that run on 5v, the 7805, and the screen only pull 300 :/
 
okay if you guys could figure it out for me and tell me that will be nice
(p.s i am using a ps1 screen and the n64 i still have the origanal case and here is the model number NUS-001(USA)
 
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