Step 4: Secure the clamps on to the battery terminals. Once the terminals are cleaned, make sure that the clamps connecting the battery cables onto the terminals are secure. Tip: If the clamps are loose, use a wrench or a pair of pliers, if available, to tighten the bolt on the side. Step 5: Inspect the battery cables.

My GBA SP AGS 101 has the red/green changing issue. I tried applying some force to the battery door, and it turns green. I think the battery may be loose, or is it dirty terminals that need cleaned? Clearly not any other issue, since it charges fine, and the battery itself isn't dying. It could be a dirty power switch.
Since you said the green light flickers and nothing else it sounds like a battery issue to me. Like the battery is completely dead. Its not uncommon for micros and gba sps since their batteries are almost 20 years old at this point. I suggest getting a new battery or perhaps a cell battery replacement.
Integrated lithium-ion battery Playing Time. approx. 18 hours without screen lighting and approx. 10 hours with screen light on. Screen Type. High-resolution TFT (thin-film transistor) screen with switchable lighting. Screen Size. 40.8mm x 61.2mm. Displayable Colours. 32,768 displayable colours 511 colours may be displayed in character mode
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The power indicator light on my AGS-101 flickers from green to red even after being freshly charged, or while plugged in! I replaced the battery a few months ago. I tried putting a piece of paper to ensure the battery was snug with the contact prongs. I tried reflowing the solder on the battery terminals and power switch in case of weakening
0 Posts. It may more likely be a problem with a zener diode, comparator, or transistor (depending on the circuit), rather than with the green/red bi-color LED itself. Without seeing a schematic and troubleshooting it, this is just a guess. Your best bet would be to pay to have it repaired or at least diagnosed. The battery of your Game Boy Advance SP requires a charge every three hours. The battery can be recharged with a standard 120-volt AC wall outlet. The gameboy advance sp has two removable prongs that you can use to plug the charger into your Game Boy Advance. The power light will turn from green to red when the battery is 30% – 20% down. My GBA SP does this too with a new battery I suspect the power curve is different than the device expects and it drops rapidly to 3.6V-ish, triggering the warning. I still get 3-5 hours of playtime even with a blinking light But it does mean the battery sucks or had some flaw in manufacturing. 85oLmA.
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  • gba sp battery light flickering