The HP iPAQ 514 battery is empty very fast. Here you can find a ARM driver update to fix this issue: http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=3360097&prodTypeId=215348&prodSeriesId=3375716&swLang=13&taskId=135&swEnvOID=4014#1130