LR44... Also known as 303 and 357 Cell size (button) batteries.
SR is the same, just means silver, LR is Alkaline PR is zinc-air.
(My opinion:: SR are better , but can cost more.)
(Hopefully its not too big... o.o)
The top is a CMOS or CR2032... the bottom two are Vintage Size batteries (you will need two).
They are
almost double the thickness of a CR2032
The little ones are also used inside Giga Pets. (Which is where these two batteries actually came from.)
Hopefully this answers your question. ^^;;
~Phnx
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