hallo guys, i want to understand more how we charge battries, could anyone give me ideas and any books or websites i can look at to know more ? like when i have battrey 12V 100Ah how i can charge it with 50w or 100w or 250w ? and how it will be different with 12V 50Ah battry and other different types? how will internal resistor will be each time?..etc i need to know everything that could help me build a battrey charger

 

As a good general source of information about batteries in general I have found Battery University to be helpful. What you do not mention and needs known is the battery type, for example a 12V 100 AH SLA (Sealed Lead Acid) battery. All batteries charge differently and charging the wrong battery the wrong way can get very dangerous and ugly real fast. Temperature is also important when charging any battery. Assuming a Lead Acid type give this a read.

Ron

 

I think this covers most of what you are asking for:

https://www.mpoweruk.com/chargers.htm
Regards,
Keith