[xubuntu] How can I maximixe my laptop battery uasge, considering my location?

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http://ubuntuforums.org – I have just got a new 9-cell laptop battery to replace my old 6-cell battery which last for just 15 minutes after less than 2 years of buying it. I live in a country where electricity supply is erratic (Nigeria). Can someone advise me how best to use these two batteries to maximize their usage considering my location and hoping the new battery won’t suffer the same fate as the old one. ____________________________________________ hp laptop battery,cheap hp laptop battery (Hardware)