Portable power solutions

[Guest Azurren]

I know there is already a thread dedicated to portable power solutions but I feel this warrants a new thread :(

Low capacity, high priced external USB batteries have been thrown around here but I always preferred the idea of AA batteries (For flexibility)

Here are the batteries I have been considering:

http://www.amazon.co.uk/gp/product/B003DUA...=A3TLXN00XR34MU

2900mah each with a combined rating of 11600mah!

Here is a 2 AA battery USB charger:

http://www.amazon.co.uk/Portable-Battery-P.../ref=pd_cp_ce_3

With the above batteries you can be looking at 5800mah

But I have no idea of the minimum voltage the SF requires to successfully charge.. So here is a 5v 4 battery charger:

http://www.amazon.co.uk/Portable-Battery-P.../ref=pd_sim_d_1

11600mah with the above batteries.. Interchangeable when they run dry

I won't pretend to know anything about this but.. The above does look very tempting (And cheaper than other portal power solutions). So could any of the above work? Will it provide this kind of power? Does the SF require 5v to charge?

In theory you get a more flexible 11600mah portable charger for under a tenner.. Or you could get a pre-built 5000mah such as this one for over £25:

http://www.amazon.co.uk/TeckNet-Dual-Port-.../ref=pd_cp_ce_1

Thanks :D

Edit: Oh and here's the link to the old topic for all you trolls:

http://android.modaco.com/content/zte-blad...power-solution/

Just copy, paste with something imaginative such as "Omg there is already a topic about this". Just trying to make your live just that little bit easier :(

Edited March 16, 2011 by Azurren

[Guest ronc2000]

I know there is already a thread dedicated to portable power solutions but I feel this warrants a new thread :(

Low capacity, high priced external USB batteries have been thrown around here but I always preferred the idea of AA batteries (For flexibility)

Here are the batteries I have been considering:

http://www.amazon.co.uk/gp/product/B003DUA...=A3TLXN00XR34MU

2900mah each with a combined rating of 11600mah!

Here is a 2 AA battery USB charger:

http://www.amazon.co.uk/Portable-Battery-P.../ref=pd_cp_ce_3

With the above batteries you can be looking at 5800mah

But I have no idea of the minimum voltage the SF requires to successfully charge.. So here is a 5v 4 battery charger:

http://www.amazon.co.uk/Portable-Battery-P.../ref=pd_sim_d_1

11600mah with the above batteries.. Interchangeable when they run dry

I won't pretend to know anything about this but.. The above does look very tempting (And cheaper than other portal power solutions). So could any of the above work? Will it provide this kind of power? Does the SF require 5v to charge?

Thanks :D

You do not understand the V (volt) and mAh.

With such battery arrangements (in series), you ADD UP the volts, not mAh.

e.g. 4 x 1.2v of 2900mAh in series make a supply of 1.2+1.2+1.2+1.2=4.8volts 2900mAh, NOT 11600mAh as you understood.

If it takes 2 x AA batteries and states that output is 5v then it has built in circuit to boost the voltage from 2.5v to 5v. In that case the mAh will be lowered (probably halved) than the original batteries.

Edited March 16, 2011 by ronc2000

[Guest Azurren]

You do not understand the V (volt) and mAh.

With such battery arrangements (in series), you ADD UP the volts, not mAh.

e.g. 4 x 1.2v of 2900mAh in series make a supply of 1.2+1.2+1.2+1.2=4.8volts 2900mAh, NOT 11600mAh as you understood.

I did think that maybe the case :D

But if you could charge the SF off the 2 battery charger then it's still a 5800mah charger if you switch the batteries?

Edited March 16, 2011 by Azurren

[Guest ronc2000]

I did think that maybe the case :D

But if you could charge the SF off the 2 battery charger then it's still a 5800mah charger if you switch the batteries?

If it has 2 batteries in series (no circuit) than it is 1.2+1.2=2.4v at 2900mAh.

As stated above if there is a circuit to boost the voltage from 2.4v to 5v some mAh will be lost then it is probably a result of a 5v 1500mAh supply. The capacity will depend on the efficiency of the circuit and IC used.

Edited March 16, 2011 by ronc2000

[Guest Azurren]

If it has 2 batteries in series (no circuit) than it is 1.2+1.2=2.4v at 2900mAh.

As stated above if there is a circuit to boost the voltage from 2.4v to 5v some mAh will be lost then it is probably a result of a 5v 1500mAh supply. The capacity will depend on the efficiency of the circuit and IC used.

So I guess the maximum these batteries could provide would be 2900mah.

Really out of my comfort zone here :D

Still a viable alternative to a portable power pack I suppose!

Thanks for clearing this up

Edited March 16, 2011 by Azurren