Battery for Sprint T5

I got a sprint with a T5 engine and Malossi cillinder 170.

Why are some SIP batteries around 25€ prefilled and others 200€ prefilled?

I planning to build in a digital speedo , better lighting and loud horn

hi ...

could you give me the item codes from the batteries that you found ?

i think the price difference is about 1 piece ant the set with 10 pieces