Max RAM is 2X8 [URL] As for the battery, you're probably going to need to look for an aftermarket one - - this system is about 8 years old, and any OEM batteries still for sale will be at least 3 years old if not more.  OEM batteries are usually available for a maximum of 5 years (new anyway) from the release date of the system, which for this model was in 2013.  
I have dell inspiron 3537 laptop with intel celeron 2955U processor and also have 2GB ram.How much ram is expandable in my laptop,Can I place 8GB+8GB Ram to increase 16GB ram in my laptop or I will place 4GB+4GB Ram to increase ram to 8GB Ram Which one do you prefer.Which ram type is suitable for it.I don't know my batteries mah(Capacity), because my laptop's battery is damaged, I can't turn on my laptop if charger is unplugged.and also which SSD will be suitable for my laptop for quick boot up in 10sec or 16sec.Please reply dell team. 
Ram SSD and Battery of inspiron 3537