I purchased this battery, then ran two discharge/charge tests
. It ran my Dell 1510 laptop battery for 3 hours both times, and recharged in less than 2 hours both times, which are the same results as the original Dell battery. At $85 less than a replacement battery from Dell, and with the same 1 year warranty, it seems to be a very good value.
About 25 days later: The battery failed - it now runs the computer only two hours, then quits. The laptop doesn't shut down normally as it would for a low battery, because the power meter indicates 35% remaining when the battery quits. Charging resumes at 35%, so it appears two cells have completely failed. I am returning the battery to Amazon.