Charging 12v 9ah lead acid battery

Jovan Stosic August 4, 2019

How should I start with this?

First you need to set the desired voltage and current limit. To charge a 12-volt lead acid battery, which has 6 cells in series, you need to set a voltage limit of 2.15-2.4V per each cell. So if it has got six of these in series you need to set the charging voltage limit to 12.9-14.4V.

The recommended charging current is between 10 and 30 percent of the rated capacity. So a 9Ah battery should be charged at about 2.5A, or lower. Once the battery is fully charged the current drops to a few percent of the rated Ah, which indicates the battery is charged.

how much do I loose if I try to charge it from 12v?

Anything above 2.15V/cell will charge a lead acid battery. This means below 2.15V/cell no charging will occur.

https://electronics.stackexchange.com/questions/336759/charging-12v-9ah-lead-acid-battery

Renata Scotto

Jovan Stosic July 31, 2019

Renata Scotto (born 24 February 1934) is an Italian soprano and opera director.

Recognized for her sense of style, her musicality, and as a remarkable singer-actress, Scotto is considered one of the preeminent singers of her generation, specializing in the bel canto repertoire with excursions into the verismo and Verdi repertoires.

Since retiring from the stage as a singer in 2002, she has turned successfully to directing opera as well as teaching in Italy and America, along with academic posts at the Accademia Nazionale di Santa Cecilia in Rome and the Juilliard School in New York. She lives in Armonk, New York with her husband Lorenzo Anselmi.

https://en.wikipedia.org/wiki/Renata_Scotto