Battery pack 128 cells picture

Which batteries should be used for this pack assembly?

The batteries used for this pack assembly should be 'Duracell' class Alkaline AA batteries only. NOT RECHARGEABLE batteries. This is the reason for the resistor and diode sub-assembly present, i.e. to inhibit the battery recharging intended for the Lithium cells which were first fitted as a part of the Master 128 design.

Why is a Master 128 battery not rechargeable?

NOT RECHARGEABLE batteries. This is the reason for the resistor and diode sub-assembly present, i.e. to inhibit the battery recharging intended for the Lithium cells which were first fitted as a part of the Master 128 design. Thus, it must be ensured that the diode is fully functional and installed with the correct polarity.

Where can I buy a dummy AA battery?

Chris Walker has emailed me with pictures and a brief description of his method using a 4xAA cell holder (Maplin order code CL19V) and a dummy battery to contain the resistor and diode assembly. The dummy AA battery is available from Maplin, having order code YX92A in the catalogue I have here (1999-2000), priced at about 64p ex VAT.

How do you keep batteries in line between points z and Y?

In order to keep the two batteries, between points Z and Y, in line and ensure permanent contact between them it is useful to construct a tight fitting tube from about 160g/m 2 card or fire-retardant material if preferred, by wrapping tightly around batteries and securing with tape.