Chargeable external battery module with up to 8.5 hours playing time for Millennium Performance, Exclusive and Supreme Tournament 55 boards
The M825 ChessVolt is compatible with the following current and former production Millennium chess computers and electronic chess boards.
- M820 ChessGenius Exclusive
- M824 The King Exclusive Lasker Edition
- M826 The King Exclusive Chess960 Edition
- M828 Chess Classics Exclusive
- M830 The King Performance
- M850 Supreme Tournament 55