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Message: <blockquote data-quote="WayneF" data-source="post: 561964" data-attributes="member: 12496">There is really only one test for a battery.  If the battery is rated at 2000 mah, will it still deliver 2000 mah? (at the standard discharge specifications).My vote is also the Maha MH-C9000.  It  has variable charge and discharge rates (up to 2 amps), and is a good tester, and it has two test modes.  It does four cells only.The one called Break-In mode actually does the IEC specifications for testing (the advertised numbers), which takes a long time (couple of days, so running it on a UPS power backup can be a pretty good idea).  It applies 16 hours of 0.1C charge, and then one hour rest, and then 0.2C discharge (measuring mah available for each cell), rest again, and then 16 hour 0.1C charge again.But it also has a mode called Discharge, where it simply discharges at the selected discharge rate (which to be a meaningful number should be the IEC 0.2C rate, which is selectable).  0.2C for a 2000 mah cell is 0.2 x 2000 rating = 400ma rate.  0.2C discharge should take about 1/0.2 =  5 hours.  I think it discharges down to 0.9 volts.   The C9000 charges and discharges each cell individually, and discharge reports its actual mah capacity (of each cell). Default charge rate is 1 amp which is 0.5C for 2000 mah cells.You can set discharge to a higher rate to be much faster, but it becomes meaningless.  Batteries are not really linear, and tested discharge mah numbers should be at the IEC specified rate.They say doing this full (2 day) breakin cycle every few dozen cycles can restore capacity in aged batteries.Manual for C9000 is <a href="http://www.thomasdistributing.com/maha/mh-c9000-charger/MHC9000_MANUAL.pdf" target="_blank">http://www.thomasdistributing.com/maha/mh-c9000-charger/MHC9000_MANUAL.pdf</a></blockquote>

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