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Old 12-22-2010, 11:38 PM #33
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Default Re: Please Help Diagnose This Battery Problem!!

Off topic: What host is that?
On topic: You could try to remove the driver/diode assembly from the host altogether and hook it up to the same cell but feel the driver for heat (If you are willing to gut it and put it back together). Depending on what host that is you could heatsink the driver depending on how much room you have. Better to ask DTR about that though.....If it is the battery charging farther than the others, you could try to charge and discharge it a few times which should lower the maximum capacity a bit.


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Old 12-23-2010, 12:06 AM #34
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Default Re: Please Help Diagnose This Battery Problem!!

Its Jays SS 18650 Kit. Heat sinking the driver isn't probably going to be possible.

And The rest of the things you say don't seem to help in anyway. Capacity isn't the issue. Feeling the driver reach its thermal shut off sounds skin meltingly painful.
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Old 12-23-2010, 12:23 AM #35
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Default Re: Please Help Diagnose This Battery Problem!!

Ok guys Watch this. This was with 3 fully charged batteries RIGHT off the charger. Should make sense.

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Old 12-23-2010, 12:46 AM #36
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Default Re: Please Help Diagnose This Battery Problem!!

I noticed was those batteries are blue. I thought you had the sanyo 2600mAh batteries that have a red wrapper. The ones in the red wrapper are the only batteries that I use and are the ones that I am familiar with.

My best guess and it is a guess is that since the voltage is lower on the cells the microboost is working harder to boost the voltage and as a result is overheating but that is only a guess.

Li-ion 18650 Cylindrical Rechargeable Cell: 3.7V 2600mAh (9.62Wh) --OEM from Japan/Korea

Also I have successfully sinked a flex driver in one of Jay's SS 18650 hosts. I used a dime but sinking a microboost is a little more difficult. You will need a small piece of aluminum to reach the chip that produces the heat(see picture below) If you wanted to switch to a flexdrive they are more efficient in the boosting process and as a result draws less current from the batteries.


Here is a microboost that Morgan sinked.

Last edited by DTR; 12-23-2010 at 12:48 AM.
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Old 12-23-2010, 12:50 AM #37
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Default Re: Please Help Diagnose This Battery Problem!!

Does the Flex at 1.1A need heatsinking. I seen yours but I dont have the parts:/

I am nervous about switching drivers.... Ahhh. Should I send these back to larry and switch for the Sanyos? In your opinion?
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Old 12-23-2010, 12:54 AM #38
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Default Re: Please Help Diagnose This Battery Problem!!

Quote:
Originally Posted by Toaster View Post
Does the Flex at 1.1A need heatsinking. I seen yours but I dont have the parts:/

I am nervous about switching drivers.... Ahhh. Should I send these back to larry and switch for the Sanyos? In your opinion?
I like to sink my drivers if they are doing more than 800mA. They probably wont over heat but I like to keep them cool.


I can't tell you that they are for sure bad. I would like to see you try to charge them with a different charger but I do know the 2600mAh Sanyos in the red wrapper that he sells should be the same as the ones that I get and that cell is my choice 18650.
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Old 12-23-2010, 12:59 AM #39
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Default Re: Please Help Diagnose This Battery Problem!!

Dont have the another Charger ATM. If the voltage checks out when I pull them from the charger doesn't that disprove the charger?

Im not trying to be sassy, just trying to disprove all I can.

Does that video with the quick battery changes seem strange to you?
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Old 12-23-2010, 01:04 AM #40
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Default Re: Please Help Diagnose This Battery Problem!!

@Toaster I didnt mean to wait until shutoff, I simply meant to see if it is heating up, and how fast. If there is not room to heatsink the driver you could just thermal epoxy the driver to the wall of the host for a heatsink, but then you would have to worry about heat dissipation throughout the host from both the driver AND the diode. If the host is staying cool when you are running it right now, then it shouldnt be a problem. Sorry about not specifying. Again, DTR seems to be helping you a lot, so thats great, just throwing in a few suggestions.
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Old 12-23-2010, 01:08 AM #41
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Default Re: Please Help Diagnose This Battery Problem!!

Yeah man, its pretty cramped in there.

Does anyone got any input on the weird behavior in the battery switch? I didn't know the batteries were so important and could impact build behavior so much!!!!
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Old 12-23-2010, 01:12 AM #42
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Default Re: Please Help Diagnose This Battery Problem!!

Do the WL method. Fill the module up with thermal grease with the driver inside.
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Old 12-23-2010, 01:14 AM #43
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Default Re: Please Help Diagnose This Battery Problem!!

Lol Right. To bad there is no module... :P
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Old 12-23-2010, 01:15 AM #44
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Default Re: Please Help Diagnose This Battery Problem!!

Really I think all you can do is not use those batteries. Not much else unless you want to have a lot of work to do.
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Old 12-23-2010, 01:23 AM #45
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Default Re: Please Help Diagnose This Battery Problem!!

Yeah man I got that down. I know the problem and I know the fix.

I want to know the Why if I can though. Thats why I DIYed it rather than buying a Yobresal build.
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Old 12-23-2010, 02:39 AM #46
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Default Re: Please Help Diagnose This Battery Problem!!

Ah alright. Well then I cant help any more. Keep contact gong with DTR, and you may want to PM FP or Jay.
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Old 12-23-2010, 03:04 AM #47
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Default Re: Please Help Diagnose This Battery Problem!!

Yeah man, I usually try not to PM on issues like this. I figure they will see it, and if they know anything, they will post what they know.

I'm gonna hope someone that knows whats going on will stop by.
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Old 12-23-2010, 03:09 AM #48
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Default Re: Please Help Diagnose This Battery Problem!!

Hey one last idea. Check the current draw from the different batteries with your DMM. See if they are showing a big difference.
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