Nand Roms bad for phones?

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http://forum.xda-developers.com – I've been flashing a lot of nand roms on my Hd2 and just recently i noticed that my phone wont charge at all(it discharges instead) on either Android or WP7 roms unless im on the official WM6.5 rom. Even onj the official WM rom, it takes hours to get a fully charged phone. On WP7 & ANDROID, fully charged (with external battery charger), the battery only last for an hours or less. I believe this resulted due to constant NAND rom flashing. Anyone with similar problems or any ideas on how to fix these? Thanks in advance. (HowTos)