1.Do not charged to higher voltages than dell battery threshold voltage. Only do a fully discharge every 30.
2.Notice : Under the temperatures of -10~40°C the laptop battery work prefectly. Over this temperature range the dell battery capactiy will reduce.
Laptop Battery Maintain Tips
3.Exercise Your Battery - Do not leave your laptop battery dormant for long time.
4.Do not short-circuit. A short-circuit may cause severe damage to the battery. So do not place your laptop battery with metal objects like coins key etc