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USB PHONE CHARGER USING 4V LEAD ACID BATTERY ?

I have a 4v 0.5Ah lead acid battery. I have made some jouel thief circuit before. I have a torrid from a old SMPS. Now I want to use them as USB 5v supply to charge phone. How to make a converter????

Downunder35m2 months ago

There are many ways to make one but they won't charge your phone as simple math is against you.
Your battery has 4V/0.5Ah, a standard mobile phone battery has 3.7V and around 2Ah.

Soumojit (author)  Downunder35m2 months ago

I can use a 4v/ 1Ah battrey. Ijust want to know how to convert 4v to 5v?