Battery capacity can be doubled to 8 telecom and 4 block size by using the top of the rack as second level
Telecom factory type open rack for 4 telecom or 2 block size batteries
Also available are : Open rack for 2 telecom batteries or 1 block size battery, Open rack for 16 telecom batteries or 8 block size batteries, Complete panel for 4 telecom batteries or 2 block size batteries, Complete for 15 telecom batteries