10.4Ah, 14Ah and 21Ah spare batteries of POSH-M13, 20Ah for POSH-M15.
 
10.4Ah battery can hold 18 holes (rough terrain 7.5 miles) at most normal courses.
14Ah battery can hold 27 holes (rough terrain 11.5 miles) at most normal courses.
20Ah/21Ah battery can hold 36 holes (rough terrain 15 miles) at most normal courses.
 
Note:
Normal courses means that courses are even and not too hilling.