Making a lithium battery power pack MF#71

How I made up my own Lithium battery power pack for the Nagra VI (6) digital hard disk recorder. 00:00 Replying to Nagra’s comment 07:28 some explanation of the battery circuit 10:53 Battery construction 14:22 Charging the battery and a look at other Nagra gear 16:30 Testing on the Nagra VI (6) I finally made up the battery and checked it on the hard disk recorder. No smoke No fire all seems OK. but will it last 7 and a half years ?.