In case your phone uses a BL 5C/BL 5CA battery , check this out
MetkuMods - Because you love your hardware!
Apparently with some jugaad you can fit the bigger capacity BL 6C instead ( 1070 mAh instead of the 5C's 850 )
tried it on my 2310. had to peel away the grey sticker and file off some plastic as shown in the guide , but it works
I know that the 2310 has stellar battery life, buts whats wrong with wanting more

will post at the end of the week how long it lasted. not sure if its an original battery that i got though :(