Replacement Dell batteries need breaking in: fully charge the notebook battery, discharge it down to 20% remaining and then
Do not impact, drop, crush, pierce, throw or hit your Dell laptop battery pack, as it can damage the battery cell inside.
Lithium Ions can be ruined if the voltage drops below a certain level, avoid letting your notebook battery drain completely and repeatedly.
Do not store your Dell laptop away for extended periods with the battery attached. Please remove the replacement Dell battery pack from the notebook before storing it away.
Fully charge/discharge battery up to 4 cycles before achieving full capacity of a new battery.
Fully discharge and then fully charge the replacement Dell laptop battery every two to three weeks for battery conditions