Just noticed this morning, slipping ammeter probes between the battery and spring to measure charging current to a 1200mah cell raised the charging voltage enough to switch from constant current charging to constant voltage charging. THERE IS NO CURRENT LIMITING IN CONSTANT VOLTAGE CHARGING! After taking the ammeter out, the charge current went from 700ma to 1.6 amps, limited only by the 4.2 volt clamp. Such overcurrents could potentially be triggered by bad contacts or jostling the battery or case.
One fix is to switch back to CC state in chargefunc.c if bulk charge current is exceeded.