First quick check for 160 AHA batteries. 40 in the front will fit easy... :/

I took some Battery data from the net.

CALB SE180AHA

Weight: 5,6kg Size: 275x182x71mm = 3.553.550mm³ / 180AHA = 19,7cm³ /1AHA

Winston LYP160AHA

Weight: 5,6kg Size: 276x209x65mm = 3.749.460mm³ / 160AHA = 23,4cm³ /1AHA

Sinopoly SP-LFP180

Weight: 5,6kg Size: 279,5x182x71mm = 3.611.699mm³ / 180AHA = 20cm³ /1AHA

Sinopoly SP-LFP200

Weight: 5,6kg Size: 279,5x182x71mm = 3.611.699mm³ / 200AHA = 18cm³ /1AHA