I ordered this charger with a 9 volt lithium ion battery with a maximum capacity of 550 mAh. At first the battery (or tester) appeared to be defective, but further troubleshooting revealed that the battery was functioning normally and the powered product was defective. The instructions say to charge for 10 hours on the first charge, but the 'Charged' indicator lights up after 2 hours, which seems a bit confusing as you naturally think the charging is complete.
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