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-   -   12V Rechargeable Lithium-Ion batteries (http://www.diyaudio.com/forums/class-d/152467-12v-rechargeable-lithium-ion-batteries.html)

audiophile36 25th September 2009 07:44 AM

12V Rechargeable Lithium-Ion batteries
 
Anybody try using 12v rechargeable lithium-ion batteries to power their class D amps? I have a 2024 based amp and wonder how long I would get on a charge?


http://www.kcheungshop.com/yourschoi...ery_12v_02.jpg

Saturnus 25th September 2009 09:04 AM

A 2024 (or 2021 and 2020) based amp uses about 350 mA at maximum volume. With that in mind it's pretty easy to calculate battery time.

Btw, there's is a new type lithium ion batteries that are far more practical, LiFePO4 or just LFP cells. These are the safest battery type in existence today. They're not just safer in every aspect than standard lithium ion, they are safer than any other battery type, rechargeable or not.

And with minimum 2000 cycles it's actually also cheaper than any other type of battery. It even has enormous charge and discharge rates, so pretty much perfect.

audiophile36 25th September 2009 12:52 PM

[QUOTE=Saturnus;1932592]A 2024 (or 2021 and 2020) based amp uses about 350 mA at maximum volume. With that in mind it's pretty easy to calculate battery time.

Thank's for the info,but how do you calculate battery time?

Saturnus 25th September 2009 01:13 PM

Quote:

Originally Posted by audiophile36 (Post 1932718)
Thank's for the info,but how do you calculate battery time?

Capacity/consumption.

So take the Ah rating (that means Amp hours) on the battery and divide with consumption (here 350mA) and you get how many hours you can expect it to run at maximum volume.

audiophile36 25th September 2009 02:13 PM

Thank you very much :)

cybermeu 25th September 2009 02:26 PM

hi :)

i'm using a ACD Battery ST65 (12V - 7,2A/h) with my ta2024 and it does work perfectly :)

no need to built powersupply, perfect to test these modules in a few minutes ...

see ya ... :)

Buckapound 28th September 2009 01:59 PM

I can second the LiFePO4 cells idea. I just swapped out my old 4AH sealed lead-acid battery for this:

http://www.batteryspace.com/lifepo4b...rtcharger.aspx

I have been a little cautious about too much draining, as the first 30 or so uses should not drain it too far, but it will power my 2021B Amp-32 based boombox for at least 8 hours, probably much more than that.

In addition to smaller size and less weight, the other advantage is really fast charging of half an hour or less. Once it's charged, the charger automatically shuts off. The cells come with an integral control board that prevents them from too-high discharge and (I think) other ways.

--Buckapound

theAnonymous1 28th September 2009 03:38 PM

Quote:

Originally Posted by Buckapound (Post 1935957)
I can second the LiFePO4 cells idea. I just swapped out my old 4AH sealed lead-acid battery for this:

http://www.batteryspace.com/lifepo4b...rtcharger.aspx

I have been a little cautious about too much draining, as the first 30 or so uses should not drain it too far, but it will power my 2021B Amp-32 based boombox for at least 8 hours, probably much more than that.

In addition to smaller size and less weight, the other advantage is really fast charging of half an hour or less. Once it's charged, the charger automatically shuts off. The cells come with an integral control board that prevents them from too-high discharge and (I think) other ways.

--Buckapound

What's the voltage after a full charge?

Buckapound 28th September 2009 04:16 PM

I'm reading 13.9 v under load.

--Buckapound.

Saturnus 28th September 2009 04:38 PM

Quote:

Originally Posted by Buckapound (Post 1935957)
In addition to smaller size and less weight, the other advantage is really fast charging of half an hour or less.

Your charger is probably too small for the pack. I can fully charge my LFP pack to 100% in 17 minutes, and to 80% capacity in about 5 minutes. The batteries don't get warm or anything. They are just incredible.


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