Advice and recommendations for external laptop battery

patwa_2

Hello,

Like many people I'm now running into the problem of not having enough laptop battery power to last through the day. It's not so much a case of wear and tear on the battery as me using the machine for longer without access to an AC power socket.

I am now in the market for an external battery for my laptop, preferrably a universal one so that the investment is not wasted when I change laptop.

My current laptop is an Acer TravelMate 6592, rated for a 90W power supply.

I have so far seen only two options that seem to be a viable choice:
1. The 2-Power branded 140Wh Universal battery
2. A universal battery from https://www.battech.co.uk rated at 133Wh. I don't know if this will take the 90W rated laptops though.

I'm no electrician, but I figure the higher the WH, the longer the battery lifetime between charges. Of course this must depend on how heavily the laptop is used and thus how much power it draws, or is the power draw from a battery source constant like for AC power?

I saw a 21200mAh battery somewhere, but it only seemed to be 74WH so maybe that's not so good.

Anyone able to shed some light on this? Also, where can I view the full 2-Power range? https://www.2-power.com just gives me a pretty logo and not much else. I've tried Google, and even Bloomberg trying to find their actual site with useable info, to no avail.

Thanks for any help.

H.

exup

I would expect a 140Wh power unit would supply a 70W system for two hours .
as for anywhere to get them - sorry not sure there

patwa_2

Hi,

I'm honestly shocked. The 133Wh battery was supposed to last 5 hours, the 140WH would presumably be longer. But I also see the logic in 140/70 = 2. Is this false advertising then, or are they using other kind of benchmark, maybe the longest possible battery time with all additional periphrels, e.g WiFi, LCD, on lowest settings?

H.

exup

This may be of help

How long can this external laptop battery last?
Actual running time may vary, depending on notebook computer's configurations and what kind of applications running .
This battery's capacity is 118 Wh (7375 mAh @ 16 V, 6210 mAh @ 19 V).

You can compare this universal battery's capacity with your internal battery capacity to figure out how long this battery can run your notebook.
For example, if your notebook internal battery out put is: 15 V & 3200 mAh;
Then, your notebook internal battery capacity is 15 V x 3200 mAh = 48000 mVAh = 48 Wh; If a brand new fully charged internal battery can run 3 hours, then the NBMate118 external battery pack can theoretically last about : 118 Wh/ 48 Wh x 3 hours = 7.37 hours.

patwa_2

Thanks, I'll try out the maths and see what I get for my battery.

Which one did you take that quote from? Out of interest.

H.

exup

i think it was here

http://www.amazon.co.uk/Universal-Battery-External-15V-20V-Rechargeable/dp/B000WLVPD8

patwa_2

Thanks, will take a look. Appreciate your time posting the link.

H.