Skip to main content
Home Forums 68kMLA Help with rebuilding a PowerBook "Type 1" battery? — #4
Post #4 by Doctor Dave
Source Forum68kMLA
CategoryHardware
Post DateSun, 15 Feb 2009 - 11:45
Original URLhttps://68kmla.org/bb/threads/help-with-rebuilding-a-powerbook-quot-type-1-quot-battery.16595/
Post
Each of the 10 individual cells is a cylinder slightly shorter and narrower than a standard AA battery:

standard "Duracell" AA: 2" long, 9/16" diameter

cell in PB battery: 1-15/16" long, 1/2" diameter

The PB battery cells notably lack the little protrusion of the positive end of the battery which AA cells have... the PB battery cells are thus essentially flat on both ends.

The fit of the cells in the case is so tight that I doubt I could make AA cells fit.

The battery also has within it four "devices" in addition to the cells. Each device has two wires, and each device looks different from the others. Does anyone know what these devices are, and what their purpose is?

As you look at the battery, it has 5 contact pads. Here is what I can visually determine to be the connectivity of the devices and cells within the battery:

pad 1 to +cell1

-cell1 to +cell2

-cell2 to device1

device1 to +cell3

-cell3 to +cell4

-cell4 to +cell5

-cell5 to +cell6

-cell6 to +cell7

-cell7 to +cell8

-cell8 to device2

device2 to +cell9

-cell9 to +cell10

-cell10 to pad5

pad2 to device3

device3 to pad3

pad3 red wire to device4

device4 black wire to pad4

No two of the four devices looks the same. Device1 looks sort of like a diode. Device2 is a rectangular metal case (approx 1 mm by 2 mm by 12 mm, with leads coming out of one small end). Device3 looks a bit like a very tiny blue capacitor. Device4 looks a bit like a small black transistor (but only has two leads going to it).

mp.ls