Nintendo 3DS appears to be water damaged

Hello, I bought this Nintendo 3DS off of Ebay trying to fix it, but I’ve already opened it cleaned it (it was very clean) with IPA, but the battery connector has the red watermark, also, when I connect it to the charger the orange light stays on, it just doesn’t power on, also, I’ve tried connecting the charger without the battery, the light stays on until I press the power button, then it turns off and nothing happens, what can it be done and thanks in advance.