What this battery module is
The Siemens 6EP1935-6MD11 is a 12-cell lead-acid battery module rated at 3.2 Ah, designed as the backup energy store for SITOP UPS systems. It snaps onto DIN rail EN 60715 35x7.5/15 or mounts via keyhole slots for M4 screws — no separate battery cabinet needed, which saves panel space. The 210 mm installation width and 171 mm height tell you the footprint: it's a wide, flat brick that fits a standard 600 mm enclosure bay. IP00 means it's an open-frame battery — install it inside a clean, dry enclosure, not on the plant floor. The operating range is -15 to +50 °C, but the capacity drops fast as the temperature climbs: at 40 °C you get 1 year typical life; at 20 °C that stretches to 4 years. That's the EUROBAT curve baked into the datasheet — plan your replacement interval around the ambient temp in the panel, not the calendar.
Charging and connection
Maximum charging current is 0.8 A — pair it with a SITOP UPS module that limits charge current to that figure, or the battery won't reach full capacity. The screw terminals accept 0.08 to 2.5 mm² wire for the +BAT and -BAT connections. An accessories pack with a 15 A solid-state fuse is included in the box. Charge voltage is temperature-compensated: at 20 °C set 27.3 V, at 40 °C drop to 26.6 V, at 0 °C raise to 28.4 V. The SITOP UPS module handles this automatically if the temperature sensor is connected — if you're wiring it to a third-party charger, you'll need to implement the compensation curve manually.
This module carries cURus recognition under UL 1778 and CSA C22.2 No. 107.1 (File E219627), plus CE and EAC marking. For marine applications it holds DNV GL and ABS shipbuilding approval — that's the key differentiator versus standard SITOP batteries. ATEX is explicitly listed as No, so it's not rated for explosive atmospheres. Lifecycle status is current production. This is not an NRND or obsolete line — Siemens still builds it, and the supply channel is standard. No official successor has been announced.