Hey! Unfortunately I need to refresh this topic, because i have problem similar to Jun Sato, but... worse..
I bought my G750JX 2 days ago and have huge problem with battery. It doesn't charge more than 90% (but the popup says "plugged in, CHARGING"). What scares me even more is the fact that the laptop suddenly turned off when running on battery (it was uncontrolled turn off - the hardware shut down without any warning or shutdown screen, like on sudden power loss), but the battery was still 40%, and appriximate battery lifetime given by the system was 2 hours. And indeed, when I tried to turn it on, is started for 2 seconds and turned off suddenly before even loading OS.
I installed BatteryInfoView to invetigate the problem, and logged my charging history. Here it is:
Event Time Power State % Capacity Capacity Value Rate Voltage Event Type
2014-03-23 16:43:03 Charging, AC Power 60.6% 51 256 43167 15 120 Timer
2014-03-23 16:44:03 Charging, AC Power 61.5% 51 967 43167 15 120 Timer
2014-03-23 16:45:03 Charging, AC Power 62.3% 52 693 43167 15 120 Timer
2014-03-23 16:46:03 Charging, AC Power 63.2% 53 403 43167 15 120 Timer
2014-03-23 16:47:03 Charging, AC Power 64.0% 54 114 43167 15 120 Timer
2014-03-23 16:48:03 Charging, AC Power 64.9% 54 840 43167 15 120 Timer
2014-03-23 16:49:03 Charging, AC Power 65.7% 55 566 43167 15 120 Timer
2014-03-23 16:50:03 Charging, AC Power 66.6% 56 291 43167 15 120 Timer
2014-03-23 16:51:03 Charging, AC Power 67.4% 57 002 43167 15 120 Timer
2014-03-23 16:52:03 Charging, AC Power 68.3% 57 713 43167 15 120 Timer
2014-03-23 16:53:03 Charging, AC Power 69.1% 58 438 43167 15 120 Timer
2014-03-23 16:54:03 Charging, AC Power 69.9% 59 134 43167 15 120 Timer
2014-03-23 16:55:03 Charging, AC Power 70.8% 59 860 43167 15 120 Timer
2014-03-23 16:56:03 Charging, AC Power 71.7% 60 585 43167 15 120 Timer
2014-03-23 16:57:03 Charging, AC Power 72.5% 61 311 43167 15 120 Timer
2014-03-23 16:58:03 Charging, AC Power 73.4% 62 022 43167 15 120 Timer
2014-03-23 16:59:03 Charging, AC Power 74.2% 62 732 43167 15 120 Timer
2014-03-23 17:00:03 Charging, AC Power 75.1% 63 458 43167 15 120 Timer
2014-03-23 17:01:03 Charging, AC Power 75.9% 64 184 43167 15 120 Timer
2014-03-23 17:02:03 Charging, AC Power 76.7% 64 879 43167 15 120 Timer
2014-03-23 17:03:03 Charging, AC Power 77.6% 65 605 43167 15 120 Timer
2014-03-23 17:04:03 Charging, AC Power 78.5% 66 331 43167 15 120 Timer
2014-03-23 17:05:03 Charging, AC Power 79.3% 67 057 43152 15 120 Timer
2014-03-23 17:06:03 Charging, AC Power 80.1% 67 767 43137 15 120 Timer
2014-03-23 17:07:03 Charging, AC Power 81.0% 68 478 43092 15 120 Timer
2014-03-23 17:08:03 Charging, AC Power 81.8% 69 204 42971 15 120 Timer
2014-03-23 17:09:03 Charging, AC Power 82.7% 69 914 42608 15 120 Timer
2014-03-23 17:10:03 Charging, AC Power 83.5% 70 610 41731 15 120 Timer
2014-03-23 17:11:03 Charging, AC Power 84.3% 71 290 40007 15 120 Timer
2014-03-23 17:12:03 Charging, AC Power 85.1% 71 940 37830 15 120 Timer
2014-03-23 17:13:03 Charging, AC Power 85.7% 72 439 0 15 120 Timer
2014-03-23 17:14:03 Charging, AC Power 85.9% 72 606 0 15 120 Timer
2014-03-23 17:15:03 Charging, AC Power 86.1% 72 802 0 15 120 Timer
2014-03-23 17:16:03 Charging, AC Power 86.3% 72 969 0 15 120 Timer
2014-03-23 17:17:03 Charging, AC Power 86.5% 73 165 0 15 120 Timer
2014-03-23 17:18:03 Charging, AC Power 86.7% 73 347 0 15 120 Timer
2014-03-23 17:19:03 Charging, AC Power 86.9% 73 468 0 15 120 Timer
2014-03-23 17:20:03 Charging, AC Power 87.1% 73 634 0 15 120 Timer
2014-03-23 17:21:03 Charging, AC Power 87.2% 73 770 0 15 120 Timer
2014-03-23 17:22:03 Charging, AC Power 87.4% 73 891 0 15 120 Timer
2014-03-23 17:23:03 Charging, AC Power 87.6% 74 042 0 15 120 Timer
2014-03-23 17:24:03 Charging, AC Power 87.7% 74 133 0 15 120 Timer
2014-03-23 17:25:03 Charging, AC Power 87.8% 74 269 41368 15 120 Timer
2014-03-23 17:26:03 Charging, AC Power 88.0% 74 375 0 15 120 Timer
2014-03-23 17:27:03 Charging, AC Power 88.1% 74 481 0 15 120 Timer
2014-03-23 17:28:03 Charging, AC Power 88.2% 74 586 0 15 120 Timer
2014-03-23 17:29:03 Charging, AC Power 88.3% 74 677 0 15 120 Timer
2014-03-23 17:30:04 Charging, AC Power 87.8% 74 012 0 15 120 Timer
2014-03-23 17:31:04 Charging, AC Power 87.9% 74 072 25295 15 120 Timer
2014-03-23 17:32:04 Charging, AC Power 88.0% 74 178 0 15 120 Timer
2014-03-23 17:33:04 Charging, AC Power 88.1% 74 239 0 15 120 Timer
2014-03-23 17:34:04 Charging, AC Power 88.2% 74 314 0 15 120 Timer
2014-03-23 17:35:04 Charging, AC Power 88.2% 74 360 0 15 120 Timer
2014-03-23 17:36:04 Charging, AC Power 88.3% 74 420 0 15 120 Timer
2014-03-23 17:37:04 Charging, AC Power 88.4% 74 481 0 15 120 Timer
2014-03-23 17:38:04 Charging, AC Power 88.4% 74 511 0 15 120 Timer
2014-03-23 17:39:04 Charging, AC Power 88.5% 74 571 0 15 120 Timer
2014-03-23 17:40:04 Charging, AC Power 88.5% 74 602 0 15 120 Timer
2014-03-23 17:41:04 Charging, AC Power 88.5% 74 632 0 15 120 Timer
2014-03-23 17:42:04 Charging, AC Power 88.6% 74 662 0 15 120 Timer
2014-03-23 17:43:04 Charging, AC Power 88.6% 74 692 0 15 120 Timer
2014-03-23 17:44:04 Charging, AC Power 88.7% 74 753 0 15 120 Timer
2014-03-23 17:45:04 Charging, AC Power 89.7% 75 645 0 15 120 Timer
2014-03-23 17:46:04 Charging, AC Power 89.8% 75 690 19051 15 120 Timer
2014-03-23 17:47:04 Charging, AC Power 89.8% 75 690 0 15 120 Timer
2014-03-23 17:48:04 Charging, AC Power 89.8% 75 736 0 15 120 Timer
2014-03-23 17:49:04 Charging, AC Power 89.9% 75 766 0 15 120 Timer
2014-03-23 17:50:04 Charging, AC Power 89.9% 75 796 0 15 120 Timer
2014-03-23 17:51:04 Charging, AC Power 89.9% 75 796 0 15 120 Timer
2014-03-23 17:52:04 Charging, AC Power 89.9% 75 811 0 15 120 Timer
2014-03-23 17:53:04 Charging, AC Power 90.0% 75 857 0 15 120 Timer
As you can see, charging almost stopped at 85%. I tested the battery on Win8 (bundled with the laptop) and win7 installed on separate ssd - same result. I honestly don't know what is going on. You may ask me what's the full charging history. Well - it's simple. When i first unboxed it, I plugged it in and it was plugged in till the moment i noticed that the battery is still 90%, but it should be 100%, because it was running on AC supply at least 6 hours. Then i decided to disconnect it and empty the battery. And this is when first sudden shutdown came at 40% battery. When it ceased to run on battery, I plugged it in again and tried to charge it full - you can see the log of that charging above.
I'm really confused with this. I'm convinced, that there is some hardware problem. I am not going to flash the bios. Please help.