JimmyM
Flashlight Enthusiast
Or on 6 cells with a soft starter. Bwahh haa haa haa.
D Lithium rechgeable 3.7v 7500mah-Feeler...
- Thread starter plasmaman
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barkingmad
Enlightened
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- Apr 16, 2007
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do you know anithing less expensive?
my mom'll kill me...
$79 is pretty cheap for a decent Lithium balancing charger - Battery Junction seem to sell the same one. Also remember it runs off 12v so you need a 12v power supply (or battery).
LEDcandle
Flashlight Enthusiast
Damn, I'd be in for one or two 
JimmyM
Flashlight Enthusiast
do you know anithing less expensive?
my mom'll kill me...
It's easier to ask for forgiveness than it is to ask for permission.
"But, Mom. This cost more because it's extremely SAFE. I thought that was a good thing? I can return it and get the dangerous one. But with the return shipping costs and the cost of the dangerous charger, I'll still have spent the same amount. Sorry I made a mistake, Mom. I'll just buy cheap dangerous stuff from now on."
JimmyM
Flashlight Enthusiast
If you can find a power supply for a laptop (11-14 v) you can easily connect it to the charger.
Daekar
Enlightened
I see some killer Milkymods in the near future if these become available...
Not much action on this topic.
barkingmad
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I PM'd and emailed plasmaman a bit ago - then sent him my address so I could test the cells for him - but nothing has arrived yet?
Guess he may not have received the cells yet or could be away...
flex76italy
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JimmyM
Flashlight Enthusiast
There was a lot of action in my efforts initially too. But then the cells that were about to be shipped, vaporized. Let's hope this is not the case.
I'd like to know what load is used to determine that 7500 mAh rating. Sounds too good to be true. Even if they come in at 5000mAh, I'm in for 10 or so.
I'd like to know what load is used to determine that 7500 mAh rating. Sounds too good to be true. Even if they come in at 5000mAh, I'm in for 10 or so.
plasmaman
Enlightened
Haven't posted for a little while as nothing to report - but now confirmed that a few test cells were sent out to me on Thursday last, so I expect to get them Tuesday next.
I will probably only get 2 cells initially, so I want to keep hold of them for now. I may get hold of a CBA tester to do this, but I will need to order it from US.
More when ready....!
I will probably only get 2 cells initially, so I want to keep hold of them for now. I may get hold of a CBA tester to do this, but I will need to order it from US.
More when ready....!
JimmyM
Flashlight Enthusiast
Send them over to Silver Fox. His tests carry a lot of weight in these forums and he's got a ton of experience testing battery capacity, etc.
plasmaman
Enlightened
Update
2 cells received as promised from the manufacturer. They have flat tops, so I have added solder blobs for connectivity.
Charged them on Cellpro 4S to max and showing 4.17v at full charge.
According to DMM reading when unpacked they had 3.5v. According to Cellpro it added 4+ amps on charging!
Now trying to source a CBA-II from US to do some reliable and meaningful tests.
Initial impressions are very good, but that's only a gut feel, so forget about it!
If the factory will supply me, and I won't know that until I visit them in September, I can foresee a big problem in shipping the things to anyone interested as they are classified as Hazchem....anyone????
2 cells received as promised from the manufacturer. They have flat tops, so I have added solder blobs for connectivity.
Charged them on Cellpro 4S to max and showing 4.17v at full charge.
According to DMM reading when unpacked they had 3.5v. According to Cellpro it added 4+ amps on charging!
Now trying to source a CBA-II from US to do some reliable and meaningful tests.
Initial impressions are very good, but that's only a gut feel, so forget about it!
If the factory will supply me, and I won't know that until I visit them in September, I can foresee a big problem in shipping the things to anyone interested as they are classified as Hazchem....anyone????
barkingmad
Enlightened
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- Apr 16, 2007
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- 578
Well I am still happy to test them on my CBA-II (here in the UK) and then post them back when done?
cnjl3
Enlightened
JimmyM
Flashlight Enthusiast
They can be shipped, It will just be more expensive. That's just life. AW ships Li-Ion cells all the time.
Discharge them at a slowly increasing rate for each subsequent test. Once they are discharged to 2.8 volts in 1 hour. That's your true 1C Ah rating.
Typically cells are rated while being discharged at 0.2C. You can actually have different Ah ratings for the same cell based on it's discharge rate.
Large deep cycle batteries are rated at their "20 hour rate". If your battery is rated at 100Ah, you will only get that 100Ah if it is discharged over a period of 20 hours. If you discharge it faster, you get fewer amp-hours before end of discharge voltage.
A battery rated at it's 0.2C rate is it's Ah capacity at the 5 hour rate.
If these things give anywhere near 6Ah at 0.2C (1.2A) I'll take 2 dozen of them.
That would run a Cree at about 1.1-1.2A for ~5 hours.
Discharge them at a slowly increasing rate for each subsequent test. Once they are discharged to 2.8 volts in 1 hour. That's your true 1C Ah rating.
Typically cells are rated while being discharged at 0.2C. You can actually have different Ah ratings for the same cell based on it's discharge rate.
Large deep cycle batteries are rated at their "20 hour rate". If your battery is rated at 100Ah, you will only get that 100Ah if it is discharged over a period of 20 hours. If you discharge it faster, you get fewer amp-hours before end of discharge voltage.
A battery rated at it's 0.2C rate is it's Ah capacity at the 5 hour rate.
If these things give anywhere near 6Ah at 0.2C (1.2A) I'll take 2 dozen of them.
That would run a Cree at about 1.1-1.2A for ~5 hours.
PhantomPhoton
Flashlight Enthusiast
Glad to hear they have been received. I'm still interested in them, even if they are a bit expensive. Are they protected ?
