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I did not know you can have a 4 volt sealed lead acid battery. It should be 1.5 volts per cell.I have seald lead acid battery.. And its rating is 4v , 1Ah..
I did not know you can have a 4 volt sealed lead acid battery. It should be 1.5 volts per cell.
Have you looked a low drop out regulaters?
What are the specs for the phone?
Opps......Lead-acid batteries are 2 V per cell, so 4 volts is just two cells.