Hi, my son managed to outlast the batteries on his 12.5 Oset yesterday so I'm considering getting him some spare ones. These are the options I have:-

(i) ones from Oset, say they are 8Ah, can see from the picture they are Ritar brand for

For those that are interested, I decided to go for the £42 Ritar batteries from eBay (http://www.ebay.co.uk/itm/400521721845?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_2295wt_1014)

These are virtually identical to the original batteries (but £18 cheaper!) and have been brilliant. Improved performance over the originals, which I assume are about 2 years old now so may be a little worn out. May also be because they are 9Ah instead of the original 8Ah.

Am left wondering how good the £28 set would have been......might get some just to see....