Simple Guidelines when Repairing HP 0A04 Battery Packs

Only connect cells that are matched in capacity. Do not mix cells of different chemistries. Never charge or discharge Li-ion batteries unattended without a working protection circuit. Each cell must be monitored individually with a protection circuit. Include a temperature sensor that disrupts the charge current on high heat. Apply a slow charge to a repaired pack to bring all cells to parity. Pay attention when using an unknown brand. Elevated temperature hints to an anomaly. Li-ion is sensitive to reverse polarization. Observe correct polarity. Do not charge a Li-ion battery that has physical damage, has bulged or has dwelled at a voltage of less than 1.5V/cell for some time. Check a repaired pack for self-discharge. Intrinsic defects often have high self-discharge.

Source from http://batteryuniversity.com

Brand new HP 0A04 14.8V 2620mAh laptop batteries Voltage: 14.8V Capacity: 2620mAh (41Wh) Battery cells: 4-cell Chemical: Li-ion Battery Color: black Condition: new original battery Warranty: 9 months

Product link: http://www.storebattery.co.nz/hp-0a04-14.8v-2620mah-laptop-battery-store-for-new-zealand-p-126044.html