The reported event was unable to be reproduced during functional testing; however, was confirmed through archive data review of the autopulse lithium ion battery (sn (b)(4).The root cause is due to improper battery charging (user error).No issue was found during functional testing of the battery.The battery was received with no physical damage and three amber lights were lit on incoming inspection.The battery was inserted into a good known reference autopulse multi chemistry charger (mcc) and after completing the charging and testing cycle.The battery was tested by inserting it in a good known reference autopulse platform using a large resuscitation test fixture.The platform performed continuous compressions for 51 minutes without any issue observed.Review of the retrieved archive data revealed, on (b)(6) 2018, the customer inserted the battery into the mcc but was cancelled during the conditioning cycle.On (b)(6) 2018, the battery was inserted in the autopulse platform without successfully charging the battery.The customer reported event is attributed to a user error during mcc charging.When an autopulse li-ion battery was placed in the mcc for charging, additional test cycles on top of the regular charging cycle may be required to successfully charge the battery.The autopulse power system user guide states that "a test-cycle can take up to 10 hours.Never interrupt a test-cycle by removing the battery from the charger.A battery that initially fails a test-cycle will automatically undergo additional test-cycles.Up to three test-cycles may be performed until the battery is considered to have failed (red led).".
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