Battery for Serveta Li150 S3

Can anyone tell me what size Battery to go for, on my Serveta Li150 S3 1980. Converting it to 12v DC, thank you.
Kev
Kev
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missing lynx wrote:Where's your battery tray is it in the normal place or behind where the toolbox door is blanked off? If it's in the normal place you want yb5l-b or 12n5-3b not sure of the type where the toolbox should be but they are larger in size