12V Rechargeable Lithium-Ion batteries - Page 2 - diyAudio
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Old 28th September 2009, 03:43 PM   #11
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I haven't timed it, so my times may well be shorter, as you say. I got the charger that came with it, shown in the link--don't know if that's undersized or not, but it seems to work fine for me.

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Old 28th September 2009, 03:56 PM   #12
kevinkr is offline kevinkr  United States
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Pretty amazing advance in battery technology... Haven't seen it mentioned but I'm assuming that you are placing a fuse between the battery pack and the amplifier to protect against the admittedly unlikely event that the amplifier fails and the battery protection circuitry does not function correctly?
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Old 28th September 2009, 04:52 PM   #13
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I have a fuse, but it's really because I had it already setup for the SLA. I'd assume the overcurrent protection circuitry is pretty reliable, but of course, it never hurts to have a backup plan.

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Old 28th September 2009, 04:53 PM   #14
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Quote:
Originally Posted by Buckapound View Post
I haven't timed it, so my times may well be shorter, as you say. I got the charger that came with it, shown in the link--don't know if that's undersized or not, but it seems to work fine for me.
Well, most LFP cells have 1C charging capacity rating. Though some have much higher. So yours can handle up to a 6.8A charger safely. With your charger you should be able to charge from 50% to 100% in about 30 minutes as you wrote, and from 0% to 80% in the same time. From 0% to 100% would take around 2 hours though.

There are some non-commercially available ones that have very very high charging rates, up to 250C is being tested, that means from 0% to 100% in under 1 minute. These does require active cooling though so it'd mostly be for electric cars but that is the primary use area for these batteries. Imagine charging your electric car faster than it does to fill your tank with gas? The future is bright!

(Provided you could find a safe way to deliver 8000A at 380V to fill a 50KWh battery in that time)

Last edited by Saturnus; 28th September 2009 at 05:00 PM.
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Old 28th September 2009, 05:42 PM   #15
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(Provided you could find a safe way to deliver 8000A at 380V to fill a 50KWh battery in that time)
Does that equal 1.21 Gigawatts?


Last edited by theAnonymous1; 28th September 2009 at 05:45 PM.
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Old 30th September 2009, 12:03 AM   #16
r0b is offline r0b  Germany
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Well, I just ordered 6 LiIon cells from DX for my portable project with a sure ta2024 board. Are there any cheap sources available for LFP cells in decent capacity? The LiIon I got were like 6,75$ for 2 cells with ~2400 mAh. The LFPs I ve seen so far are all ~1100mAh. Would seem like they are not so killer then?
Plus new charger needed again :/ LFP=A123 right? then at least my balancer would work ...
Greetings rob
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Old 30th September 2009, 12:43 AM   #17
jkeny is offline jkeny  Ireland
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I also have some of these LIFePO batteries that I bought for powering 3.3V DACs, etc. I only just started to try them - have you guys been using them for long? Amazing current delivery (internal impedance of about 4mohm!). Great youtube vid of a guy jump start a car with 4 of these in sub-zero temp http://www.youtube.com/watch?v=qcvmvrmTMMk

How does the Tripath amp sound powered by these? I have a TA2020 amp which I want to use with these batteries - the only thing stopping me is getting solder to adhere to the base of the batteries for connecting 4 in series. I need a more powerful soldering iron!

There's a report of a visit to Audio Consulting in one of the on-line audio mags where he runs all his equipment on these batteries - amp, DAC, turntable, etc

Last edited by jkeny; 30th September 2009 at 12:55 AM.
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Old 30th September 2009, 12:58 AM   #18
jkeny is offline jkeny  Ireland
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Well, I just ordered 6 LiIon cells from DX for my portable project with a sure ta2024 board. Are there any cheap sources available for LFP cells in decent capacity? The LiIon I got were like 6,75$ for 2 cells with ~2400 mAh. The LFPs I ve seen so far are all ~1100mAh. Would seem like they are not so killer then?
Plus new charger needed again :/ LFP=A123 right? then at least my balancer would work ...
Greetings rob
You're looking at the wrong LFP's then - 2,300mAH is widely available & you don't need a special charger - they are much more tolerant of over-charging & over-discharging than the LiIons.
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Old 30th September 2009, 11:24 AM   #19
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Originally Posted by r0b View Post
Well, I just ordered 6 LiIon cells from DX for my portable project with a sure ta2024 board. Are there any cheap sources available for LFP cells in decent capacity? The LiIon I got were like 6,75$ for 2 cells with ~2400 mAh. The LFPs I ve seen so far are all ~1100mAh. Would seem like they are not so killer then?
Plus new charger needed again :/ LFP=A123 right? then at least my balancer would work ...
Greetings rob
3400mAh: http://www.batteryspace.com/lifepo42...napproved.aspx
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Old 30th September 2009, 11:52 AM   #20
r0b is offline r0b  Germany
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Ok, thats still like double the price. I guess maybe one could find them a little cheaper someplace else. I mean the 18650 Trustfire 2 cell deal for $6,75 (unprotected) is a killer deal too. I guess they are fine for my small portable project.
I'll consider the LFP for my next project, where size/weight is less high on the priority list.

Anyone know of a simple charger that is capable of charging LiPo/LFP (SLA would be nice too) at least 4s or so? Not too expensive, since I already have an rc-hobby charger for LiPo and everything (except LFP of course) and that thing is kind of bulky with AC-Adapter+Balancer+breakout for the balancer... I would enjoy a more compact solution!

Sorry if you feel the thread highjacked, but I guess it's still pretty much on-topic. If not, just say so, and I'll stop or delete the posts!

r0b
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