12V 55AH AGM Battery Insert 6FM55SGT-DX Replacement

Description

12V 55AH AGM Battery Insert 6FM55SGT-DX Replacement

Restore reliable backup runtime with a 12V sealed AGM (Absorbent Glass Mat) replacement battery for Vision 6GFM50B and Toyo 6GFM55,  6GFM55-HDapplications. This style is maintenance-free, non-spillable, and built for dependable standby power in demanding environments like emergency lighting inverter systems, UPS, telecom, and general backup power.

Key Features

• 12V sealed AGM (VRLA) technology – spill-proof & maintenance-free
• NB (Nut & Bolt) terminals for secure ring-lug connections
• Designed for standby/backup and light cyclic use
• Strong performance in common backup-power environments (lighting, UPS, telecom)

Size & Terminal Fit (Verify Before Ordering)

• 12V 55AH AGM Battery Insert 6FM55SGT-DX Replacement approximately 10.3 × 6.7 × 8.8 in, NB terminals, 12V
• 6FM55SGT often appears in a Group 22NF-style footprint (varies by sub-model and terminal option)

Important: “6GFM50B HD” and “6GFM50B” “6GFM55” can exist in different case sizes depending on the exact variant and vendor listing. Always match: Voltage (12V), capacity class (50–55Ah), terminal type (NB), and physical dimensions.

Replaces / Compatible Models (When Specs Match)

• Vision and Toyo: 6GFM50B, 6GFM55, 6GFM55-HD
• Common equivalents (match size + terminals): UB12500 (12V 50Ah class), UB12550 / ML55-12 (12V 55Ah class)
• Other 12V ~55Ah cross-refs seen in distribution: 6FM55SGT WKDC12-55P, CP12-55, EVA12-55C/FR, HZB12-55, TY12-55, WRA12-55C/FR

Used In / Applications

• Emergency lighting inverter / backup systems that provide lighting power during outages
• Emergency lighting units and building egress backup power systems
• UPS (uninterruptible power supplies) and standby battery cabinets
• Telecom and general standby power

Information Gain (Buyer Checklist)

• Terminal check: NB (nut & bolt) posts require ring lugs—different from F2/F11 insert or spade tabs.
• Measure the case: length × width × height must match your tray/cabinet clearance.
• Capacity tolerance: 50Ah vs 55Ah can be acceptable only if the charger/inverter specs allow it and the physical size matches.
• System voltage: many emergency lighting inverters use multiple 12V batteries in series—replace as a matched set when required.

FAQ

Q: Is 6GFM50B-HD the same as 6GFM55?
A: Not always. They may be close in capacity, but case size, height, and terminals can differ by variant. Match 12V, Insert terminals, and dimensions before ordering.

Q: What does “Insert” mean?
A: Insert threaded terminals—you attach ring terminals M8 threaded (common in inverter/UPS cabinets).

Q: Where are these batteries typically used?
A: In emergency lighting inverter/backup systems, UPS, telecom, and standby power. Emergency lighting inverters are designed to power lighting circuits (including overhead fixtures and exit signs) during outages.

Q: Can I replace only one battery in my inverter cabinet?
A: Sometimes, but many inverter/UPS systems perform best with matched batteries of the same age/type. Check your manufacturer guidance.

Q: How long should an emergency lighting backup battery last?
A: Service life depends on temperature, charging profile, and discharge frequency. If runtime is dropping, testing/inspection is recommended.