Looking for 12V 20ah-40ah battery, what about this?

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lagoausente
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Joined: Thursday, September 3, 2009 - 05:40
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Looking for 12V 20ah-40ah battery, what about this?

Hello, I´m looking for a 12V high capacity battery for use it to power diferent electronic devices. They are not electric vehicles, but I´m looking here because usually handle high capacities at reasonable prices.
Some external laptop batteries at 170Wh, cost 200-250$, depending, usually typical Li-ion smart battery packs like this ones: http://www.bixnet.com/suhiexbaford.html
Or this ones; http://www.batterygeek.net/product-p/spps-12-444_batterygeek.htm
http://www.batterygeek.net/product-p/spps-12-222_batterygeek.htm
This ones 444Wh and 222WH respectively. I guess how they could perform, because a lot of cells seem to be used inside that to can get such capacity with sigle cells, so I doubt about their durability.

In the other hand, after some searching about lifepo4 have found this: http://gwl-power.tumblr.com/tagged/quote
In the middle of the web there are 12V models, LP20ah, LP40ah. Price 61euro and 122 euro. That´s much cheaper $/Wh than the battery packs above mentioned. what do you think about? Any reference to this batteries? Other sellers?
I have been thinking about building my own level led indicator like the smart battery packs to know the charge remaining, and using a 12V regulator to get a flat 12V from the battery.
One of the devices I should supply should be like this one: http://www.sonic-core.net/en/products/xite-1.html
It´s an audio interface that requires 12V and 2A consumption. So could get 10 horus with a 20ah. But probably I should supply another device that requires also 12V 0.5A.
sorry for this "offtopic" usage of the batteries but I think is the best place where I can get info for my purpose, since there is not much more options out there.
PD: I don´t want SLA since it´s too weighted.
I should thank your opinions, or suggestion about sellers distributors.., I´m in Europe.
Thanks in advance.

Spaceangel
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Last seen: 1 month 1 week ago
Joined: Wednesday, July 15, 2009 - 15:49
Points: 500
Re: Looking for 12V 20ah-40ah battery, what about this?

I think you are on the right track.

I have been thinking about building my own level led indicator like the smart battery packs to know the charge remaining, and using a 12V regulator to get a flat 12V from the battery.
One of the devices I should supply should be like this one: http://www.sonic-core.net/en/products/xite-1.html
It´s an audio interface that requires 12V and 2A consumption. So could get 10 horus with a 20ah. But probably I should supply another device that requires also 12V 0.5A.
sorry for this "offtopic" usage of the batteries but I think is the best place where I can get info for my purpose, since there is not much more options out there.
PD: I don´t want SLA since it´s too weighted.
I should thank your opinions, or suggestion about sellers distributors.., I´m in Europe.

I found out that most of my computers and PDA use 16 to 19 volt input and didn't want to use a 12 volt to 19 volt Converter. So I used 5 Yellow Thunder Sky Cells in series to power a lot of my electronic devices at libraries or cafe' shops. It seems to have cycle life and just like you mentioned it does need a LED to monitor battery life. I use a cheap Harbor Freight DMM every hour or so. It is rather bulky to use 20 AH TS cells but with a back pack it is light. Some of the brand names of computers I use on that 19.2 volt arrangement are Toshiba, HP, IBM think pad 600, HP mini101, HP ZD8000, and HP 450 printer.

KB1UKU

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