battery and charger

[kamranhafeez100]

i want to know that for 4 v and .8AH battery what charger will be perfect i want know know the charger rating?

 

[Hero999]

It depends on the battery chemistry.

 

[colin55]

It also depends on how fast or slow you want to charge the battery.
You can charge it in 1 hour or 14 hours. And the battery will either suffer or last its full intended life.

 

[audioguru]

I don't think people from 3rd-world countries know about any new rechargeable battery except the old lead-acid type used in cars for nearly 100 years.
They don't know about Ni-Cad, Ni-MH, Rechargeable-Alkaline, Lithium-Ion or Lithium-Polymer.

Therefore they should ask on a website in their own country.

 

[kamranhafeez100]

hello audioguru


we r already using Ni-Cad, Ni-MH, Rechargeable-Alkaline, Lithium-Ion or Lithium-Polymer batteries in commercial areas in PAKISTAN but i m talking about my own cheap lead acid battery that i use to glow leds in my home

 

[audioguru]

My car has a lead-acid battery. It charges it. I have never used a lead-acid battery for anything else. Your lead-acid battery is tiny.
For my LED projects I use Alkaline, Ni-MH and Lithium-Ion battery cells.
For my electric model RC airplanes I use Lithium-Ion and Lithium Polymer batteries.

My AC electricity is reliable and inexpensive so most things are powered from it.

 

[colin55]

You haven't answered the question I asked.

 

[audioguru]

A lead-acid battery is for cars that charges them. I don't want to find a charger circuit for your little lead-acid battery. You find one or design one.

 

[crutschow]

For such an odd lead-acid battery voltage you will likely have to build your own charger. You could use a 6V transformer with a bridge rectifier and filter, and an LM317 regulator set to about 4.7V output voltage (assuming it's a two-cell battery). You many need to add a small resistor in series to limit the initial charging current if the battery is significantly discharged.