If you are hooking batteries up in series, connect the positive terminal of one to the negative of the next, and so on. The following formula applies to series circuits: (V total = V 1 +V 2 etc.). This will provide you with extra voltage for the load, but no extra current (I total = I 1 = I 2 etc.).
[pdf] Telecom cabinets require robust power systems to ensure networks remain operational. A Grid-connected Photovoltaic Inverter and Battery System for Telecom Cabinets effectively addresses this need. These systems convert sunlight into electricity, promoting energy savings and operational efficiency.
[pdf] Minimum cabinet height = Rack height (to top of rail) + Battery height + Space above battery (12" ideal) + Charger height + 6" (for space above charger) Chargers need room to breathe and batteries need extra room above for maintenance (watering and testing).
[pdf] 
