The HP F4486-60001 battery must be kept cool. Ideally, they are stored in a refrigerator. The aging take its toll much faster at higher temperatures. The high temperatures found in cars lithium-ion batteries due to rapid degradation. When you use a laptop running from fixed line power over extended periods, the battery for HP F4486-60001 may be removed and stored in a cool place, so it is unaffected by the heat generated by the computer.