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Old 08-24-2010, 09:34 AM #33
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Default Re: RYOBI 445nm Schweet 4volt 6Wh battery!!

Quote:
Originally Posted by CrazyMonkey View Post
I think really, you would need to log the voltage as well as current through the whole discharge cycle to correctly calculate the Wh. 1500mAh assumes the voltage stays exactly at 4v, or at least 4v is the average voltage throughout the discharge cycle.
Semantics anywho, close enough.
You're right on that, but battery manufacturers tend to over-estimate these things by margins large enough to stop caring about the details. Actual energy content (and mAh's delivered) depend on the rate of discharge in nearly all types of battery, so without knowing that part, you might as well multiply mAh's with stated voltage and be done with it

As for exploding cells: if you short them out, most will go out with a bang or get hot enough to damage whatever they are in. This was true for NiCd batteries back in the day, and still holds true for lithiums and sometimes even lead acid batteries.

The problem with lithiums is that some of them exploded in unexpected circumstances, like when discharged too far, or even spontanously in a very few cases. On the other hand, you can sometimes abuse them beyond reason: i have a camera rechargable lithium that went through a washing and drying cycle in a pocket, and it still works, just some corrosion on the contacts


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Old 08-24-2010, 01:05 PM #34
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Default Re: RYOBI 445nm Schweet 4volt 6Wh battery!!

Lithium is also bad because at high temp it will react with air(or anything) quite strongly.
I do RC planes, so I've had my share of lithium issues. Had 2 packs
"puff" so far, none exploding yet, lol. The problem with 18650's is they
can't puff. just build up pressure, then rupture unexpectedly. At least with
prismatic cells(aluminum foil package!), you can see them puff(swell up).
These may be A123 cells, which cannot create gas when something goes wrong.
I am sure that's why so many power tools are using A123 cells now.
The capacity is not as good, but they have more recharge cycles, high discharge and charge rates, and are safer.

** Edit

Never mind about being A123 cells, those are 3.3V
Here is a link to ebay for A123 cells

Last edited by CrazyMonkey; 08-25-2010 at 02:19 AM.
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Old 08-25-2010, 03:20 AM #35
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Default Re: RYOBI 445nm Schweet 4volt 6Wh battery!!

36h charge time?!?! Yuck.
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Old 08-25-2010, 11:31 AM #36
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Default Re: RYOBI 445nm Schweet 4volt 6Wh battery!!

^ I think it means the interval between charges.
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Old 08-25-2010, 11:06 PM #37
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Default Re: RYOBI 445nm Schweet 4volt 6Wh battery!!

...ahhh

Damn then!!
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