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Looking for Serious External Laptop Battery

post #1 of 4
Thread Starter 
I've given up searching for an i5/i7 laptop with 8 hours of battery life.

Instead, I'm going to get a 15"/17" Sandy Bridge laptop with (likely) under 2 hours of battery life and an external battery.

I've seen these so-called 20,000 mAh batteries and the 1,000$ 400 Watt-hour ones for Macs..

But I need someone who knows batteries.
I need as much capacity as possible without being Way too expensive.

Any help appreciated!
White Phoenix
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White Phoenix
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post #2 of 4
I can help you compute the size of the battery you need, about where to buy it from my suggestion is ebay; the cheaper are usually sent from Taiwan/Singapore and have good quality (from my experience).

Some math is necessary in order to buy exactly what you need, not too big/expensive battery, but neither too small/cheap that it doesn't do the job required. If you need 8 hours of battery life, you can compute what size of battery you need. If your lappy needs (for example) 60W on average, for 8 hours you need 480Wh. If the battery ratings is in mAh you can compute the necessary mAh for 8 hours like that: Capacity [mAh]=1000xPowerxHours/BatteryVoltage; example: for 8 hours, 60W and 19V you need 24000 mAh.
Edited by dragosmp - 1/14/11 at 2:39am
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Centurion
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post #3 of 4
Quote:
Originally Posted by Track View Post
I've given up searching for an i5/i7 laptop with 8 hours of battery life.

Instead, I'm going to get a 15"/17" Sandy Bridge laptop with (likely) under 2 hours of battery life and an external battery.

I've seen these so-called 20,000 mAh batteries and the 1,000$ 400 Watt-hour ones for Macs..

But I need someone who knows batteries.
I need as much capacity as possible without being Way too expensive.

Any help appreciated!
What about a UPS? for teh lols!
post #4 of 4
Thread Starter 
Quote:
Originally Posted by dragosmp View Post
I can help you compute the size of the battery you need, about where to buy it from my suggestion is ebay; the cheaper are usually sent from Taiwan/Singapore and have good quality (from my experience).

Some math is necessary in order to buy exactly what you need, not too big/expensive battery, but neither too small/cheap that it doesn't do the job required. If you need 8 hours of battery life, you can compute what size of battery you need. If your lappy needs (for example) 60W on average, for 8 hours you need 480Wh. If the battery ratings is in mAh you can compute the necessary mAh for 8 hours like that: Capacity [mAh]=1000xPowerxHours/BatteryVoltage; example: for 8 hours, 60W and 19V you need 24000 mAh.
Okay see, that's where it gets complicated.

Either you have something like this, which is insanely expensive:
http://www.batterygeek.net/130Wh-Mob...atterygeek.htm

Or you have something that claims 20,000mAh but with too many voltages and is insanely cheaper and looks cheap:
http://www.sales-battery.com/Externa...p_battery.html

I need something inbetween.
White Phoenix
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CPUMotherboardGraphicsRAM
i7-2600k Gigabyte P67A-UD7-B3 GTX 480 SLi G.Skill 16GB (4x4GB) 1600/CL7 
Hard DriveOptical DriveOSMonitor
Crucial C300 256GB LG 6x BD-RW/HD-DVD Windows 7 SP1 Ultimate 64-bit Dell 'PLP' - 2007FP | 3007WFP-HC | 2007FP 
KeyboardPowerCaseMouse
Logitech G510 Silverstone 1000w [80A]-Rail Antec p190 (Modded) Logitech G700 
Mouse Pad
Steelpad SteelSeries Experience I-2 
  hide details  
Reply
White Phoenix
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-2600k Gigabyte P67A-UD7-B3 GTX 480 SLi G.Skill 16GB (4x4GB) 1600/CL7 
Hard DriveOptical DriveOSMonitor
Crucial C300 256GB LG 6x BD-RW/HD-DVD Windows 7 SP1 Ultimate 64-bit Dell 'PLP' - 2007FP | 3007WFP-HC | 2007FP 
KeyboardPowerCaseMouse
Logitech G510 Silverstone 1000w [80A]-Rail Antec p190 (Modded) Logitech G700 
Mouse Pad
Steelpad SteelSeries Experience I-2 
  hide details  
Reply
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