Charge batteries using tel lines

[electroniks]

Years ago I thought about making a circuit that charges 2 rechargeable battries using telephone lines but I never persued it. Now I want to see if it really works or not.
I know that tel lines here are 90v (OC) and around 50mA (CS). (or is it?!)
since for charging batteries I think I need about 3v and around 2000mA then I thought I can just transform 90v/50mA to 4.5v/1000mA.
Is this going to work theoritically?

 

[akg]

Years ago I thought about making a circuit that charges 2 rechargeable battries using telephone lines but I never persued it. Now I want to see if it really works or not.
I know that tel lines here are 90v (OC) and around 50mA (CS). (or is it?!)
since for charging batteries I think I need about 3v and around 2000mA then I thought I can just transform 90v/50mA to 4.5v/1000mA.
Is this going to work theoritically?

the open ckt voltage is ~50v DC normal and 75v AC during ringing , now when it is closed (off-hook , 600 ohm impedence), the line voltage drops to ~10V , so u won't get 90V/50ma , AND it may be illegal to connect devices like that to telephone lines .

 

[audioguru]

I hope that you aren't going to explode a little battery with a whopping 2A of charging current! The little 3.6V Ni-Cad rechargable battery in a phone charges with only 10mA to 30mA depending on its size.

Only a couple of mA from a phone line causes it to be "off hook" and therefore it is busy. If the phone company's central office is next door to you, then you might get 100mA from a phone line. If you are far away then the current is less.
Use a real charger for the battery.

 

[falmeshon]

It may be illegal in your country to hook up ANYTHING to your phone line without certification.

 

[Macka]

Its definately illegal in Australia, not that they would know unless you stuffed something up or a technitian came into your house fault finding.......

 

[neon]

it is illigal in any countries the wiring belongs to the company including sources of power you cannot modefy re engineer any of it without consent. besides a charger cost practically nothing and solar energy even less.