I have had good experiences with these batteries in the past. 19.99 for one plus charger and 34.99 for two.
http://www.htcexpress.com/htc-battery/43-htc-sensation-battery-1900mah-battery-dock-usb-chgr.html
http://www.htcexpress.com/htc-battery/43-htc-sensation-battery-1900mah-battery-dock-usb-chgr.html
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