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Old 03-15-2009, 04:53 PM   #21 (permalink)
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Originally Posted by DrMoze View Post
A little knowledge is a dangerous thing. Ten bucks says it is impossible under anything close to normal conditions to release that energy in anywhere close to a second, even in a poorly-manufactured battery. Even if you shorted the battery, terminal-to-terminal. So the 'caution' is way overblown.

FWIW, I bought 2 eBay batteries for my Pearl used them for over a year (rotating occasionally). Normal life, never a problem.

And yeah, sometimes OEM batteries are defective too.
My apologies. I share this coming from watching some colleagues build a battery protection system using a real-time controller and custom-made PCBs. Obviously, we used cells that had ZERO protection (the pack consists of 598 of them, to be exact).
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Old 03-15-2009, 05:31 PM   #22 (permalink)
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Originally Posted by dasunst3r View Post
My apologies. I share this coming from watching some colleagues build a battery protection system using a real-time controller and custom-made PCBs. Obviously, we used cells that had ZERO protection (the pack consists of 598 of them, to be exact).
That is a serious pack, quite far from commercial standard configurations (or even poorly-made imitations thereof).
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Old 03-16-2009, 11:10 AM   #23 (permalink)
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just wanted to add that i absolutely love the travel charger. being able to just swap the batteries out instead of plugging in the usb cord in that awful location is such a blessing.

when the batteries aren't exploding in my pants of course.
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Old 03-16-2009, 01:49 PM   #24 (permalink)
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Not sure how much use this is, as it is just one person's experience, but a few weeks ago I bought a battery from Hong Kong -- the brand is Cameron Sino -- and it is working just fine. I can't see any difference between this one and the OEM one, but it's early days!

I will say, though, that it is a tremendous comfort to have a spare battery in my pocket, especially when I'm on the move and I see that yellow bar come up, followed by the red bar, to tell me I'm nearly out of juice. I know I can just swap in the spare battery, et voilą!
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Old 03-16-2009, 01:51 PM   #25 (permalink)
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Not sure how much use this is, as it is just one person's experience, but a few weeks ago I bought a battery from Hong Kong -- the brand is Cameron Sino -- and it is working just fine. I can't see any difference between this one and the OEM one, but it's early days!

I will say, though, that it is a tremendous comfort to have a spare battery in my pocket, especially when I'm on the move and I see that yellow bar come up, followed by the red bar, to tell me I'm nearly out of juice. I know I can just swap in the spare battery, et voilą!
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Old 03-18-2009, 01:11 AM   #26 (permalink)
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My cheapo eBay battery seems to be broken in now and it's still working great. I may just pick up another because of the low cost.

I can make it two days with heavy usage and be at 10-15% by the time it hits the charger, perfect! Also with less recharging, the battery will last longer, so maybe it will make it as long as an OEM battery would as far as lifetime goes.

Also the main reason for LIon failures with cheap batteries is the overcharge protection on them. Most LIon batteries have the protection built onto the cell as well as the charging circuit. Some cheap cells do not come with this circuit and they also aren't as tolerant as the OEM for voltages so the charging circuit can sense that the battery is charged completely.

If it keep charging the battery at a standard rate vs the trickle rate that should kick in, it will cause the battery to overheat and rupture. Also if they're overcharged, they can start the leaking/rupturing process early and it might take a few hours to have it "pop" after it's off the charger.
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