I would be '''very cautious suggesting the use of heat''' on these batteries, you risk fire. explosion, noxious fumes serious personal/property injury!! Apple's technicians have been told that the battery is not a replaceable part. their solution is to replace the top case assembly, to which the battery is fixed. ''IMnsHO '''encouraging a DIY to attempt this proces would be on the order of encouraging an amateur to work on a CRT'''--irresponsible and unprofessional.''