3G FOMA battery problems in Japan
3G FOMA Handset Battery Issues
NTT DoCoMo confirmed that some D06 series batteries manufactured through May 2006 and installed in DoCoMo FOMA™ D902i handsets could generate excessive heat and possibly rupture during charging if the batteries have been subjected to a strong external impact.
Oooh deary me. I hope this is just an isolated incident.