The trick with the old battery is to lift the edge with the pry tool, NOT have the look lean against the circuitry to actually PRY it off. use lifting not leverage. This will avoid applying force against the logic board and potentially breaking something. Something that should be added in the guide is that the battery cable doesn't actually clip and old into it's socket: it's actually held in place by the bracket! Otherwise, great guide and just finished doing mine with the ifixit supplied battery and tools. It works great so far!