[Nexus 4 Accessories] Ruag:
Here is the log of battery monitor widget (from 40% to 100%):

2013/04/02|23:52:09|759mA|40%|3909mV|29.2ºC|.766|16
2013/04/02|23:53:09|521mA|40%|3880mV|30.0ºC|.183|15
2013/04/02|23:54:09|756mA|40%|3933mV|31.2ºC|.683|15
2013/04/02|23:55:09|765mA|41%|3896mV|31.8ºC|.0|15
2013/04/02|23:56:09|761mA|42%|3907mV|32.2ºC|.0|15
2013/04/02|23:57:09|760mA|42%|3895mV|32.5ºC|.0|15
2013/04/02|23:58:09|711mA|43%|3945mV|33.0ºC|.0|15
2013/04/02|23:59:09|762mA|43%|3955mV|33.3ºC|.0|15
2013/04/03|00:00:09|727mA|44%|3954mV|33.7ºC|.0|15
2013/04/03|00:01:09|678mA|45%|3959mV|34.1ºC|.0|15
2013/04/03|00:02:09|775mA|45%|3959mV|34.5ºC|.0|15
2013/04/03|00:03:09|763mA|46%|3965mV|34.8ºC|.0|15
2013/04/03|00:04:09|780mA|46%|3966mV|35.2ºC|.0|15
2013/04/03|00:05:09|760mA|47%|3963mV|35.5ºC|.0|15
2013/04/03|00:06:09|759mA|48%|3972mV|35.8ºC|.0|15
2013/04/03|00:07:09|759mA|48%|3975mV|36.1ºC|.0|15
2013/04/03|00:08:09|723mA|49%|3972mV|36.5ºC|.0|15
2013/04/03|00:09:09|286mA|50%|3979mV|36.7ºC|.0|15
2013/04/03|00:10:09|488mA|51%|3986mV|36.9ºC|.0|15
2013/04/03|00:11:20|362mA|51%|3897mV|37.2ºC|.0|15
2013/04/03|00:12:09|737mA|52%|3985mV|38.0ºC|.0|15
2013/04/03|00:13:09|759mA|52%|3995mV|38.1ºC|.0|15
2013/04/03|00:14:13|278mA|53%|3916mV|38.3ºC|.0|15
2013/04/03|00:15:09|739mA|53%|3995mV|39.0ºC|.0|15
2013/04/03|00:16:30|186mA|54%|3936mV|39.5ºC|.0|15
2013/04/03|00:18:18|508mA|55%|3954mV|40.7ºC|.0|15
2013/04/03|00:19:31|474mA|55%|3939mV|41.4ºC|.116|15
2013/04/03|00:19:53|-40mA|55%|3913mV|41.6ºC|.0|15
2013/04/03|00:20:09|339mA|55%|3947mV|41.5ºC|.0|15
2013/04/03|00:21:09|335mA|56%|3947mV|40.6ºC|.0|15
2013/04/03|00:22:09|705mA|56%|3994mV|40.4ºC|.0|15
2013/04/03|00:23:09|260mA|57%|3965mV|40.7ºC|.0|15
2013/04/03|00:24:09|757mA|57%|4026mV|40.8ºC|.0|15
2013/04/03|00:25:09|488mA|58%|4024mV|40.8ºC|.0|15
2013/04/03|00:26:09|731mA|58%|4040mV|40.9ºC|.0|15
2013/04/03|00:27:09|293mA|59%|3993mV|41.0ºC|.0|15
2013/04/03|00:28:09|774mA|59%|4049mV|41.0ºC|.0|15
2013/04/03|00:29:09|284mA|60%|4004mV|41.1ºC|.0|15
2013/04/03|00:30:09|764mA|60%|4057mV|41.4ºC|.366|15
2013/04/03|00:31:09|776mA|61%|4064mV|41.6ºC|.0|15
2013/04/03|00:32:09|764mA|62%|4061mV|41.9ºC|.0|15
2013/04/03|00:33:09|755mA|62%|4070mV|41.9ºC|.0|15
2013/04/03|00:34:09|339mA|63%|4022mV|42.2ºC|.0|15
2013/04/03|00:35:09|755mA|64%|4081mV|42.4ºC|.0|15
2013/04/03|00:36:09|283mA|64%|4088mV|42.6ºC|.0|15
2013/04/03|00:37:09|400mA|65%|4040mV|42.9ºC|.0|15
2013/04/03|00:38:09|755mA|65%|4094mV|43.0ºC|.0|15
2013/04/03|00:39:09|756mA|66%|4054mV|43.2ºC|.0|15
2013/04/03|00:40:09|759mA|67%|4058mV|43.3ºC|.0|15
2013/04/03|00:41:09|771mA|67%|4112mV|43.4ºC|.0|15
2013/04/03|00:42:09|721mA|68%|4104mV|43.5ºC|.0|15
2013/04/03|00:43:09|770mA|69%|4115mV|43.7ºC|.0|15
2013/04/03|00:44:09|352mA|69%|4063mV|43.0ºC|.666|16
2013/04/03|00:45:09|338mA|69%|4056mV|42.7ºC|.0|15
2013/04/03|00:46:09|339mA|70%|4069mV|42.5ºC|.0|15
2013/04/03|00:47:09|340mA|70%|4072mV|42.3ºC|.0|15
2013/04/03|00:48:09|338mA|70%|4076mV|42.1ºC|.0|15
2013/04/03|00:49:09|355mA|70%|4078mV|42.0ºC|.0|15
2013/04/03|00:50:09|61mA|71%|4055mV|41.9ºC|.0|15
2013/04/03|00:51:09|319mA|71%|4083mV|41.8ºC|.0|15
2013/04/03|00:52:09|288mA|71%|4087mV|41.6ºC|.0|15
2013/04/03|00:53:09|354mA|72%|4091mV|41.5ºC|.0|15
2013/04/03|00:54:09|355mA|72%|4093mV|41.5ºC|.0|15
2013/04/03|00:55:09|355mA|72%|4096mV|41.4ºC|.0|15
2013/04/03|00:56:09|349mA|73%|4100mV|41.4ºC|.0|15
2013/04/03|00:57:09|356mA|73%|4104mV|41.3ºC|.0|15
2013/04/03|00:58:09|339mA|73%|4106mV|41.3ºC|.0|15
2013/04/03|00:59:09|328mA|74%|4102mV|41.3ºC|.0|15
2013/04/03|01:00:09|324mA|74%|4102mV|41.2ºC|.0|15
2013/04/03|01:01:22|150mA|74%|4081mV|41.2ºC|.0|15
2013/04/03|01:02:09|342mA|74%|4112mV|41.8ºC|.0|15
2013/04/03|01:03:09|348mA|75%|4120mV|41.7ºC|.0|15
2013/04/03|01:04:09|-26mA|74%|4081mV|41.6ºC|.100|15
2013/04/03|01:05:09|248mA|75%|4116mV|41.9ºC|.583|15
2013/04/03|01:06:09|346mA|75%|4129mV|41.7ºC|.0|15
2013/04/03|01:07:09|349mA|76%|4132mV|41.6ºC|.0|15
2013/04/03|01:08:09|341mA|76%|4129mV|41.4ºC|.0|15
2013/04/03|01:09:09|348mA|76%|4132mV|41.3ºC|.0|15
2013/04/03|01:10:09|348mA|77%|4142mV|41.1ºC|.0|15
2013/04/03|01:11:09|348mA|77%|4145mV|41.0ºC|.0|15
2013/04/03|01:12:09|254mA|78%|4148mV|40.9ºC|.0|15
2013/04/03|01:13:09|296mA|78%|4138mV|40.8ºC|.0|15
2013/04/03|01:14:09|341mA|78%|4154mV|40.8ºC|.0|15
2013/04/03|01:15:09|349mA|79%|4155mV|40.7ºC|.0|15
2013/04/03|01:16:09|316mA|79%|4160mV|40.7ºC|.0|15
2013/04/03|01:17:13|60mA|79%|4104mV|41.0ºC|.766|15
2013/04/03|01:18:09|333mA|79%|4144mV|41.6ºC|.650|15
2013/04/03|01:19:09|338mA|79%|4159mV|41.4ºC|.0|15
2013/04/03|01:20:09|339mA|80%|4163mV|41.2ºC|.0|15
2013/04/03|01:20:49|-292mA|80%|4072mV|41.5ºC|.116|15
2013/04/03|01:21:41|228mA|79%|4125mV|42.1ºC|.483|15
2013/04/03|01:22:41|319mA|80%|4146mV|42.4ºC|.0|15
2013/04/03|01:23:41|324mA|80%|4164mV|42.0ºC|.0|15
2013/04/03|01:24:41|323mA|80%|4171mV|41.7ºC|.0|15
2013/04/03|01:25:41|229mA|81%|4175mV|41.4ºC|.0|15
2013/04/03|01:26:41|326mA|81%|4173mV|41.1ºC|.0|15
2013/04/03|01:27:41|321mA|81%|4171mV|40.9ºC|.0|15
2013/04/03|01:28:41|308mA|82%|4173mV|40.7ºC|.0|15
2013/04/03|01:29:41|744mA|82%|4175mV|40.5ºC|.0|15
2013/04/03|01:30:41|743mA|82%|4249mV|41.6ºC|.0|15
2013/04/03|01:31:41|270mA|83%|4259mV|42.1ºC|.0|15
2013/04/03|01:32:41|743mA|84%|4267mV|42.6ºC|.0|15
2013/04/03|01:33:41|744mA|84%|4225mV|43.1ºC|.0|15
2013/04/03|01:34:41|743mA|84%|4281mV|43.4ºC|.0|15
2013/04/03|01:35:41|195mA|84%|4175mV|43.6ºC|.0|16
2013/04/03|01:36:41|-126mA|84%|4154mV|43.5ºC|.0|16
2013/04/03|01:37:41|751mA|84%|4257mV|43.8ºC|.0|16
2013/04/03|01:38:41|-20mA|84%|4152mV|43.9ºC|.316|16
2013/04/03|01:39:41|818mA|84%|4208mV|44.1ºC|.216|16
2013/04/03|01:40:41|503mA|84%|4184mV|44.0ºC|.0|16
2013/04/03|01:41:41|756mA|84%|4272mV|43.9ºC|.0|16
2013/04/03|01:42:41|548mA|84%|4277mV|43.9ºC|.0|16
2013/04/03|01:43:41|558mA|84%|4283mV|43.9ºC|.0|16
2013/04/03|01:44:41|710mA|84%|4287mV|43.8ºC|.0|16
2013/04/03|01:45:41|653mA|86%|4308mV|43.9ºC|.0|15
2013/04/03|01:46:41|597mA|89%|4310mV|43.8ºC|.0|15
2013/04/03|01:47:41|591mA|89%|4313mV|43.7ºC|.0|15
2013/04/03|01:48:41|573mA|91%|4313mV|43.7ºC|.566|15
2013/04/03|01:49:41|548mA|92%|4315mV|43.6ºC|.0|15
2013/04/03|01:50:41|521mA|92%|4310mV|43.3ºC|.0|15
2013/04/03|01:51:41|289mA|92%|4298mV|43.1ºC|.0|15
2013/04/03|01:52:41|476mA|93%|4321mV|42.8ºC|.0|15
2013/04/03|01:53:41|370mA|93%|4322mV|42.5ºC|.0|15
2013/04/03|01:54:41|436mA|95%|4324mV|42.3ºC|.0|15
2013/04/03|01:55:41|416mA|95%|4325mV|42.0ºC|.0|15
2013/04/03|01:56:41|400mA|95%|4330mV|41.8ºC|.0|15
2013/04/03|01:57:41|383mA|95%|4327mV|41.5ºC|.0|15
2013/04/03|01:58:41|330mA|96%|4328mV|41.5ºC|.650|15
2013/04/03|01:59:41|349mA|96%|4330mV|41.2ºC|.0|15
2013/04/03|02:00:41|290mA|97%|4298mV|41.0ºC|.333|15
2013/04/03|02:01:41|324mA|97%|4331mV|40.9ºC|.416|15
2013/04/03|02:02:41|309mA|97%|4333mV|40.5ºC|.0|15
2013/04/03|02:03:41|294mA|97%|4334mV|40.1ºC|.0|15
2013/04/03|02:04:41|281mA|97%|4335mV|39.7ºC|.0|15
2013/04/03|02:05:41|268mA|97%|4336mV|39.2ºC|.0|15
2013/04/03|02:06:41|263mA|97%|4336mV|39.0ºC|.200|15
2013/04/03|02:07:41|249mA|97%|4337mV|38.6ºC|.0|15
2013/04/03|02:08:41|240mA|97%|4338mV|38.5ºC|.0|15
2013/04/03|02:09:41|230mA|97%|4338mV|38.6ºC|.0|15
2013/04/03|02:10:41|222mA|97%|4338mV|38.6ºC|.0|15
2013/04/03|02:11:41|189mA|99%|4332mV|38.8ºC|.550|15
2013/04/03|02:12:41|63mA|99%|4317mV|39.2ºC|.1000|15
2013/04/03|02:13:41|178mA|99%|4335mV|39.3ºC|.433|15
2013/04/03|02:14:41|192mA|99%|4339mV|39.4ºC|.466|15
2013/04/03|02:15:41|183mA|99%|4340mV|39.2ºC|.0|15
2013/04/03|02:16:41|174mA|99%|4341mV|39.1ºC|.0|15
2013/04/03|02:17:41|172mA|99%|4340mV|39.0ºC|.566|15
2013/04/03|02:18:41|164mA|99%|4342mV|39.1ºC|.0|15
2013/04/03|02:19:41|157mA|99%|4342mV|39.1ºC|.0|15
2013/04/03|02:20:41|151mA|99%|4343mV|39.2ºC|.0|15
2013/04/03|02:21:41|-212mA|99%|4290mV|39.6ºC|.550|16
2013/04/03|02:22:41|143mA|99%|4330mV|39.5ºC|.983|16
2013/04/03|02:23:41|76mA|100%|4323mV|39.7ºC|.1000|15

Yes, sometimes sound a hiss. I use the iPad 10w (2.1A) usb charger.

He also contact to me.