The Ansmann 4LR44 is a 6V alkaline battery for use with various electronic devices.
Price: £2.49 from Wex Photographic
The Ansmann Battery Box can hold up to 8 of any one of AA, AAA, or CR123A batteries or a number of memory cards.
The Ansmann CR2025 3 V lithium battery is a small button type battery, suitable for powering many types of watches, calculators, etc.