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> 5.2v Psp Battery, is this safe for a c3000?
danboid
post Nov 15 2006, 01:15 AM
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We got a 5.2v Li-ion PSP battery pack- we didn't know it was 5.2 until it arrived in the post. Is this safe to use or could it fry our c3k?
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scholbert
post Nov 20 2006, 12:53 PM
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Hi,

which battery are you talking about?
I could only find 3.7V PSP packs in the web.

Do you want to connect it directly, which means inside the c3k or are you gonna use the DC connector at the back?

If you use the DC-input, let me notice something about input voltages in general.
Normally, handheld devices can handle voltage levels +10% above and -10% under the nominal voltage level at their DC input connectors and i think it's the same with the c3k devices from sharp.
This means a voltage up to 5.5V should not damage the device.

But be aware, that this the absolute maximum value!!!
Take care of this fact if the battery is fully charged and may deliver a higher voltage level.

If you are unsure, you could drop the voltage by a schottky diode in series to the battery wink.gif .

Greets,

scholbert
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Drake01
post Nov 20 2006, 03:17 PM
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QUOTE(scholbert @ Nov 20 2006, 03:53 PM)
Hi,

which battery are you talking about?
I could only find 3.7V PSP packs in the web.

Do you want to connect it directly, which means inside the c3k or are you gonna use the DC connector at the back?

If you use the DC-input, let me notice something about input voltages in general.
Normally, handheld devices can handle voltage levels +10% above and -10% under the nominal voltage level at their DC input connectors and i think it's the same with the c3k devices from sharp.
This means a voltage up to 5.5V should not damage the device.

But be aware, that this the absolute maximum value!!!
Take care of this fact if the battery is fully charged and may deliver a higher voltage level.

If you are unsure, you could drop the voltage by a schottky diode in series to the battery wink.gif .

Greets,

scholbert
*

I'm not an electrical engineer and have limited knowledge of batteries, but I believe that Li-Ion batteries require circuits to regulate the discharge rate of the battery. On some batteries, the circuits are incorporated into the battery package. Other batteries (this seems to include the battery in my C1000) have no onboard regulating circuit and this function is performed by the device, itself.

My point is that you may wish to verify that with someone knowledgable about this topic whether it would be a good idea to connect your battery to the DC connector on your Z. (I'm sure that this was your plan, rather than hooking it to the interior battery terminals.) I'm not sure if there would be a potential to fry your Z or perhaps damage the battery (remember Dell laptops?), but it's probably better to play it safe.

Just my $0.02
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scholbert
post Nov 21 2006, 04:00 AM
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Drake01 is absolutely right!!

Maybe i was a bit too lazy with my answer huh.gif .
You should be very very careful with a lithium cell connected directly to a device.
It might be very dangerous in case of short circuit!
The other critical aspect is missing protection against low voltage.
If a lithium cell is discharged below a certain voltage level it gets damaged.
At least you will also need a special charger for the cell.

Regards,

scholbert
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