Gaming Why is my GBA always reading low battery?

Gaidai

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Welp, I'm stumped.

I'm sorry for the wordiness, but I feel that if I'm asking for help, I should provide as much information as I can. If I've done anything wrong, posted this incorrectly, I apologize in advance and will take steps to correct it. This is the first time I've ever had a console problem so baffling that I've needed to straight up ask for help - normally I can find what I need on the internet. But I can't find any issue specifically like this that has been addressed before. I would be grateful for some assistance.

My problem is the battery indicator on my GBA SP - specifically, it starts going red after only about 30 minutes of play on a full charge, every time. Here are my theories and what I've tried:

The battery is bad. I very much doubt this, as I have replaced the battery twice now with brand new ones - no change in behavior. Granted both my replacement batteries were third party, but they were from different manufacturers, one that came recommended from another thread on this very site. For them both to have the same exact problem seems an unlikely coincidence.

The motherboard/power switch/contacts/etc are dirty. I have done teardowns and cleanings on this thing before, most recently just last night. No change. I know my way around how to do that, but it's always possible I could have missed something. Still, this doesn't seem likely either.

I screwed something up while doing a housing swap. I replaced the entire housing on this console some years back. Again, this is something I know how to do, and have done before, but that does not mean I didn't somehow screw something up anyway. But that was years ago, and though I have had this battery problem for a good long while now, I can't recall if that's when it started. I don't think it was.

The console is throwing a low battery warning when the battery isn't actually low. I guess this relates to the theory above? Could I have screwed up something internally to make that happen? Is the board just old and on its last legs? I suppose I should test to see if the console actually dies quickly when the battery indicator goes red. I haven't done that yet - I've only had it run for an additional 15 minutes or so on a red indicator, but...it didn't die. If it's only doing for 30 minutes before going red, and there is actually a low charge, you'd think it would die in less than half that time again after it goes red.

A flashcart screwed something up. I'm familiar with all the debates around the theory that the voltage requirements of a flash cart could damage a console over time, and I've seen the explanations both for and against this all laid out. But, I don't know what else to consider here. This console has had three different kinds of flashcart in it since I've owned it: Two fire linkers, an EFA Linker II, and an EZ-Flash Omega. If one of these did cause the trouble, I doubt it was the omega, because I've only had that for maybe two weeks. The Fire Linkers I've had for a long time (naturally) and I don't really use them anymore. As far as I know they both worked fine, except that the label on one said '256mbit' when the actual capacity was only 128. Of the three carts, I'm most suspicious of the EFA Linker. I don't use that one anymore because it eventually refused to save, but of the three, it was the one I used the most by far. Also, from extensive research I was able to determine that my EFA linker is actually a knockoff - it does not support drag and drop. To use it, I had to write roms and saves to the cart using a program called 'long_card'. At the time I didn't know this was indicative of a knock-off, and eventually I decided to just not worry about it, as it was working great - only the process of adding roms was a bit slower. But...it's still a knock off, according to the code on the back of the board. Could it have been responsible? It was never actually in any of the consoles during the writing process, but certainly it was there while playing games and making saves.

Another important point to note is that I also own a GBA Micro, and it is doing the exact same thing. I have not changed the battery in that one but come on...the same exact problem, two completely different consoles? This suggests to me that the problem is a flash cart, because that's the only thing I can come up with in common to both systems - both of them have had all three of my flash carts in them. What else could they have in common, aside from the fact that I charge them both from the same wall outlets in my house? They've also both had the same retail carts in them...is it even possible for a retail cart intended for this system to cause issues with it?

And so, here I am. I enjoy my GBA devices, but with battery life this bad, they're all but unusable. Did a flash cart ruin them both? Or is something else to blame?

Can anyone shed some light on this?

Thank you!!
 

FAST6191

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The battery light is mainly in response to a voltage sensor rather than anything particularly interesting or involved.

Flash carts can see it lower by virtue of their increased current draw dropping the voltage (there is a reason the average battery specs sheet will have curves for multiple current draws). That would be where I head.

I don't know what fire cards are like offhand but I would not be surprised to hear they are thirsty.

As for replacement batteries I am not going to rule out multiple ones being sub par or faulty either. A flash cart in and of itself should not break the battery -- dead shorts/massive current draws across batteries do break things but simply using a bit more current should not be a problem for that.
 

Gaidai

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Thanks for the quick response.

So, there could be something wrong with the voltage sensor, then. Meaning that on a full charge I'll probably still get hours of life, but I'll be spending all but thirty minutes of those in the red, and I'll never really know when my battery is dying? Or else...replace the entire main board. What gets me though, is how that could have happened on both my consoles, unless some catalyst caused the same problem. And the only thing they were both exposed to beyond the normal outlet current in my home were my flashcarts. Both consoles are doing the same thing even if I put a retail cart in them now...leading me to believe that something has damaged their ability to read the battery voltage over time.

Fire Linkers are very old flash carts, like...I think they may even pre-date the original Supercard, or close to it. They only have 128mbit of capacity. You cannot drag and drop to them, you have to write roms. If you write only one, it will boot immediately to it and act exactly like a retail cart with the same game on it (so you could, for example, create your own rom hack and make it boot as though it were a retail cartridge game). If you write more than one (usually no more than two will fit in 128mbit), it will create its own menu on bootup to select them from. These things originally came with a parallel port cord, if that's at all indicative of the age (though there's now a modern way to use them without that port).
 

migles

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I have a gba sp and the battery is good, however the contact is creating a similar issue.
the battery can still hold a charge very close to what is in the wikipedia page (8+ hours)
the thing is, i need to snap the power button in a specific "clean" way otherwise it will show red while the battery is more than half full.
sometimes i turn it on, shows red and my "obsessive me" turns it off and on again in the right way just to show green (even tough i know the battery has more than half charge, my brain is scared that it dies in a game)
i am guessing the contact is just old and not in a good shape.. but ya know, i am surprised that the battery is fine for how old this thing is...
 

Gaidai

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I've heard that general wear around the switch can cause this, yeah. Still hesitant to label that as my problem because it would have to be happening on both systems, and generating exactly the same behavior between them. But now I'm thinking maybe I should just turn it on, let it go red, and see how long it runs. Maybe it will still get hours of play, just...on red. And then wonder if it's really a coincidence that it happened to both systems in the same way.
 

zfreeman

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Gaidai

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Yes, I've heard about the modifications needed to put a DS battery in a GBA, just have yet to try it. As far as the shelf life of a battery, well...I dunno, do third party manufacturers still make these things new? Or have they all been sitting around since these consoles were more popular? OEM I suspect would be the latter, but I wouldn't find it strange that somebody out there would still manufacture them if there was any market at all. But then, I have no way to know how long my "new" battery has been sitting around. Alas, the lack of future proofing on these things. Makes me consider doing a backlight mod on an original GBA and enjoying the AAs, heh.

At this point I'm leaning towards "somehow both the voltage sensors on both your consoles are ruined, so you can either play it in the red forever, or find a new main board to put in it".
 

Gaidai

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Well, I wasn't planning to do one in the near future (I don't even own an original GBA anymore), but I had good success with it on my DMG-01, so it's been in my head to try. Thanks for the heads up on that though.
 

The Real Jdbye

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The voltage sensor on the original GBA was always kind of crappy, way too sensitive (as in it turns red too easily and many times I had it flickering rapidly between red and green), I would not be surprised if it's the same on the GBA SP/GBM. Even the DS models suffered from this a bit.
That being said, I definitely haven't experienced it turning red with an almost full battery, except for when I was touching the power switch as that can cause it to flicker.
So this doesn't seem like normal behavior but considering these consoles are getting old now it could just be normal wear and tear. I doubt it has anything to do with the flashcarts. Those batteries probably aren't being made anymore, and who knows if old stock is still good.
 

Gaidai

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Update on this. I am since trying to keep the console's running on red to see how long they last. All told, it looks as though I'm getting about 70 minutes or so from full charge to console death. That's with both batteries on the SP, and the battery in the GBM. I get that we have no idea how long these batteries sit around even when they're marked new, but it still seems way too much of a coincidence for all of them to be behaving the same way, in two different consoles. But beyond that, I'm stumped. The only thing I can think is that maybe that bootleg EFA Linker had something to do with it, as unlikely as that seems.
 

Gaidai

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Well, I hope nobody minds if I keep this thread going on a bit longer, but I thought I should continue to document the situation in case anybody else ever has this problem. I managed to find yet a third GBA SP battery, so I tried that one. All three batteries are by different manufacturers, and have different capacities (700mah, 850mah, 900mah). Two were "brand new" when I obtained them, I don't remember on the third (didn't even realize I had it). Charged it up to full, switched it on at exactly 7:59am (full brightness and volume on an AGS-101), and it went red at 8:34am. So...35 minutes until low battery warning.

All the batteries do the same thing regardless of age or manufacture, and though I only have one battery for the GBM, it exhibits once again, the same exact behavior. This battery is of still another different manufacture than the SP ones, because it's OEM.

I'm honestly getting kind of fed up with it all. I just want to play with my OEM GBA consoles, and I'm getting the idea that if it's not something related to the main board or a flashcart, then batteries for these things must be incredibly hit or miss now in terms of their shelf age, to the point that buying still more new ones would be throwing darts at a board. I like doing mod work anyway, so I'm leaning towards getting a scuffed up original GBA for cheap, doing a housing swap/backlight mod, and basking in the joy of future proofed AA batteries :)

I'm still happy to take suggestions though, and appreciate any input anyone may have!
 

brickmaker

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Don't believe the stated capacity of any asian made battery unless it's made by one of the major Japanese manufacturers Panasonic, Sanyo etc. With some knowledge and a multimeter you can tabulate real figures and figure it out yourself. Sensors work on real-time voltage, so you can predict what a sensor is going to do based on the instantaneous voltage and visa versa. If the batteries are fine, it's then mostly likely a 'high resistance' switch as "migles" stated - having a switch in a certain way to make it green and not red = high resistance switch. You can measure the switch resistance from the battery source terminal to the destination (remove the battery 1st); and as long as your multimeter reads below a few Ohms, the switch is probably ok. You will also need to make sure that your placement of the probes is not assisting the connection of the faulty switch! Note the comments below this attached video.
 

Gaidai

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I'll take a look, thanks.

But if the switch were bad, would that actually be producing reduced battery life? Or would it simply be reading the charge on the battery wrong? Because the batteries do seem to actually be dying from a full charge in only about an hour. And I definitely get what you're saying about third-party batteries, but it still seems strange to me that four tested batteries, one of which is OEM, and none of which are by the same manufacturer, are producing exactly the same reduced life, even across two different console types. You'd think that even if they're all bad, they would be outputting poorly in various degrees. If it is the batteries, it seems like I'm just a victim of a massive coincidence. And if the switch is bad, is it even possible to find parts for/replace that on something like a GBA SP?

Thanks for the input!
 

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