dx true 100mW batteries

hi i just bought my first laser, a dx true 100mW, but im not sure what batteries to use to achieve the greatest performance (i do realise that its a dx and i shouldnt expect too much : ) any help would be appreciated  

*edit* i found these, they seem incredibly cheap and im curious if anyone knows if there any good?

ww.argos.co.uk/static/Product/partNumber/9800744/c_1/1|category_root|Home%2Bentertainment%2Band%2Bsat%2Bnav|12108813/c_2/2|cat_12108813|Batteries|12108854/c_3/3|cat_12108854|Standard%2Bbatteries|12108857.htm

buy the SANYO 1000mah- at DX or focalprice. i have the focalprice one........and they are very good. these batteries ARE NOT low self discharde.. but are TURE 1000mah ..also 1050.....

i thought those only run at 1.2V, doesn't that mean its working worse than the 1.5V batteries or does that not effect it?