Battery turning off notebook when about 70 percent its full capacity.

present: yes
design capacity: 5100 mAh
last full capacity: 4416 mAh
battery technology: rechargeable
design voltage: 10800 mV
design capacity warning: 227 mAh
design capacity low: 137 mAh
cycle count: 0
capacity granularity 1: 10 mAh
capacity granularity 2: 25 mAh
model number: Primary
serial number:
battery type: LION
OEM info: Hewlett-Packard


These are data from my HP notebook battery, as given by /proc/acpi/battery/BAT0/info. It usually charges up to around 4416 mAh. But when reaching nearly 3000 mAh, the machine is turned off without properly closing open files or dismounting the partitions, so when turning it on again, fsck is run, etc.

My question is why this happens when the battery is around 3000 mAh when the design capacity low is 137 mAh. Who or what turns off the machine?

Sounds to me like it may be a defective battery. If its new, RMA it. If its old, get a new one. If you get a new one, be careful about your source. There are a lot of cheap batteries on eBay that may be a fire hazard.