Feb. 20, 2016 Ben Carson greets people at the Beacon Drive-In restaurant in Spartanburg on the day of the South Carolina Republican presidential primary. Jabin Botsford/The Washington Post Buy Photo
If your battery is unhealthy after less than 6 months you should try to get a replacement from dell. You have posted to a forum that requires a moderator to approve posts before they are publicly available. A 9 cell battery usaully last around 4-6 hours.
Finally, if you would like a D-size battery that can supply 20 amperes of current for a short time (5 seconds), that will last for 10 years, check out the Ultracapacitor at Maxwell Technologies Inc. It is not really a battery at all, it is a 350 farad capacitor rated 2.5 volts.