[Battery] Extended Battery or just Battery with more "juice"

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I'm looking for an extended battery for the sgy of my Girlfriend. I have also the choice to solder two stock batteries together (parallel). But than I'll have a problem with the battery cover. Is there anyone with experiences in extended battery (not external) from sgy? Or is there anybody with experiences in soldering li-ion batteries together?

Thnx

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external batt pack need to be chosen carefully, some dont work with SGY (like mine)

Originally Posted by mai77

external batt pack need to be chosen carefully, some dont work with SGY (like mine)

External is exactly NOT what I'm looking for

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Does your battery heats up? because mine does.....

Originally Posted by Cerillus

Does your battery heats up? because mine does.....

What do you mean? I've not jet built my own double sized extended battery, but I want to.
There are no extended 3000mAh batteries for SGY. So I have to buy two 1500mAh. These I'll solder together parallel, so I'll get a 3000mAh battery and build a custom battery cover

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I think you should be carefull since the circuit only tolerate up to 2000mA current.

Originally Posted by kurotsugi

I think you should be carefull since the circuit only tolerate up to 2000mA current.

Why? The discharge load is the same, but the battery can support longer the discharge load (mA) at 3,6-3,7 Volts. So I dont put more mA in the circuit, just able to do it longer.

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hey guys, free shipping
http://www. dealextreme.com/p/3-7v-1500mah-rechargeable-battery-for-samsung-galaxy-y-s-5360-black-107728

Originally Posted by DerBobo

Why? The discharge load is the same, but the battery can support longer the discharge load (mA) at 3,6-3,7 Volts. So I dont put more mA in the circuit, just able to do it longer.

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you sure ccoz i think theyd give a higher voltage rating if put together,,,

Originally Posted by zeusseuz

you sure ccoz i think theyd give a higher voltage rating if put together,,,

They give more voltage if you put them in series, but if you put the in parallel they give more amperes