The earlier Vidor CN430 Lady Anne on the label (and on Trader Sheet) use the L5546 Battery. But the later CN430 Lady Anne on the label uses the L5550 (= Ever Ready B148 )
B148 / L5550 is 72.75 x 3.5 x 3.5 inch (70 x 89 x 89 mm)
L5546 is 3 x 3.5 x 3.5 inch (76 x 89 x 89 mm)
I can't find photos or scans of any of these.
If you subtract height wasted in a B126 by the connector, the layer cells DO fit in the shorter 89mm vs 96mm (approx). Then there is space for 5 x U10 and the connector beside the layer cells. Since the filament voltage is more critical than HT, the pack is approximately 580mAH HT and 2500mAH LT, but the LT is at 0.9V per cell. At 1V it's maybe 2000mAH.
So about 64 hours HT @ 9mA and about 75 hours LT, but series chain has parallel resistors etc, so LT might be less. Thus it's approximately balanced with HT pack always being fully used. All Balanced packs have a bit more capacity on filament to give more consistent performance as performance is more sensitive to filament variation.
Here is my best guess (a plan) of the L5550
If anyone needs it I will upload the high resolution (200dpi) pages to the Library. You need to inkjet (or colour Laser) at 200dpi such that square end is under 3.5" x3.5" (89 x89) including side walls after folding.
Print two pages and cut and use Pritt/UHU paper glue stick to plain side of a cereal packet. Leave end opposite to connector open and make a card or plastic frame for 10 x PP3 arranged 3 + 3 + 2 and then 5 x AA cells in 4way + 1 holders.
It uses the large Octal style Type "W" connector (only 7.5V connection, not 9V socket) which is an Octal style pitch with a dummy offset pin.
See How to make Sockets
See Example of Inner Frame + socket