[Q] Red light flash after switching battery

Okay im not a noob by most means i been on xda for years but i am stuck heres what i did. My original nexus 5 battery was quite aged so i opted to buy a new one on ebay as well upon firing up new battery in phone... nothing. So i switched back... nothing. Original battery worked before. When i plug in with either battery i get red light flashes. My assumption is somehow i fried the motherboard. Please let me know if someone could help me. Btw ive kept on charger for days and tried getting into revovery etc. Only sign of life is red flashes. Im stuck with stupid Samsung galaxy mega right now so im sure you can understand the urgency and thank yoy to all especially the developers here on XDA, with or without an answer your work is so appreciated beyond what you get credit for

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