Laptop Battery Calculation.

2 comments

Rate

rshingala Participant Join Date: Oct 2011 Posts: 2	Laptop Battery Calculation. 10/08/2011 8:51 AM
	Hi All, I am a guy from IT background and I don't have any idea regarding battery calculation. Can anyone guide me to calculate battery capacity which I am want to use in my design please. My requirement is Battery should long for at least 6 hours. Currently I am having battery of 7600mAH, Battery voltage 7.4V. Adapter rating is : 19VDC & 2.1 A This battery gives me backup of 3 HRS. (battery is having 4 cell each of 14wAH and 3300mAH) How can I calculate mAH of battery as I want to re-design for 6 cell capacity. Thanks in advance. Rajesh
	Register to Reply
	Pathfinder Tags: battery laptop battery calculation

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

These comments received enough positive votes to make them "good answers".

lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: Laptop Battery Calculation. 10/08/2011 12:48 PM
	Try to learn how to search. How to calculate battery run-time when design equipment using ...www.powerstream.com/battery-capacity-calculations.htmHow to calculate battery run-time ... Notes for Design Engineers: How to calculatehow much battery capacity you need. I know, I feel ... Cycle life considerations ... What is an Amp Hour and How to Calculate Battery Capacity ...overlandresource.com/what-is-an-amp-hour-and-how-to-calculate-ba...What is an Amp Hour and How to Calculate Battery Capacity ... battery to it's completely flat, empty, dead state as it will significantly reduce the life of the battery.... [PDF] Battery Lifeedge.rit.edu/content/.../Battery%20Info/Battery%20Life%20Info.pdfFile Format: PDF/Adobe Acrobat To calculate battery life use the following formula: battery capacity (milliamphours) / total current (milliamp) = battery life (hours) where: total current =transmitter ... How to calculate battery life? - CNET Camcorders Forums forums.cnet.com/7723-7594_102-9859.html
	Register to Reply Good Answer (Score 5)

Haajee Guru Join Date: Feb 2006 Posts: 1758 Good Answers: 6	#2 Re: Laptop Battery Calculation. 10/09/2011 11:45 AM
	Regards As far as the capacity rating calculation is concerned: << battery is having 4 cell each of 14wAH and 3300mAH) >> 14wAH means if you draw 14W continuously it will sustain for 1 hour at 1/10 c 3300mAH= 3.3 AH means if drain is 3.3A it will sustain for 1 hour. at 1/10 c If less power or amps are used it will of course sustain longer but there is no direct formula. You have to test it or if manufacturer data shows some graph then you can approximate. [say 1/ 11 c or lower] Higher drains of course will drain earlier. [say 1/9 c or higher] If you like to design for a higher volts battery it will be advantage of longer backup time in the same AH/ but you will have to re-design your system. Remember increasin voltage or capacity will increase the size of the battery.
	Register to Reply

These comments received enough positive votes to make them "good answers".

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (89 right now) Show Members