Stupid Battery Question - Multiple Button Batteries

[aphex]

Disected a little LED toy. There are three button batteries stacked back to back, each 1.5v.

Trying to figure out if I can replace the three 1.5v batteries with a single or double AA or AAA.

 

[Viper GTS]

No, you can't. You need 4.5V.

Viper GTS

 

[aphex]

Originally posted by: Viper GTS
No, you can't. You need 4.5V.

Viper GTS

Hrmph

 

[polarmystery]

Originally posted by: aphex
Disected a little LED toy. There are three button batteries stacked back to back, each 1.5v.

Trying to figure out if I can replace the three 1.5v batteries with a single or double AA or AAA.

Need more info about said toy

 

[aphex]

Originally posted by: polarmystery

Originally posted by: aphex
Disected a little LED toy. There are three button batteries stacked back to back, each 1.5v.

Trying to figure out if I can replace the three 1.5v batteries with a single or double AA or AAA.

Need more info about said toy

I'll post pics shortly. Its kinda small

 

[Mark R]

White LEDs typically have Vf about 3.6V. In these cheap lights, they use the internal resistance of the button cells as ballast.

It's not a direct swap to more powerful batteries like AAs, as an appropriate ballast resistor would be required.