6-DMF-52 12V52Ah UPS Battery: Complete Buyer Guide for Data Centres and Telecom

Answer First

The 6-DMF-52 is a 12 V 52 Ah valve-regulated lead-acid AGM monobloc rated at C3, measuring 224×135×175 mm at 13.7 ± 0.2 kg with φ11.8-M6 terminals. Factory setpoints are fixed and verifiable: 13.5 V float (2.25 V/cell), 14.1 V equalise (2.35 V/cell), 10.4 A maximum charge current, 1.75 V/cell discharge cut-off, ≤3 %/month self-discharge at 25 °C and a −15 °C to 50 °C working range. Every figure below comes from the published model data.

For data centre and telecom purchasing teams the decisive point is that the 6-DMF-52 sits in the middle of the 12 V AGM range: large enough to carry a 12 V string through a typical ride-through window, small enough to fit a two-rack module without structural work. Import programmes in India, Nigeria, Kenya, Vietnam, the Philippines and Brazil routinely standardise on this class of cell. Specifications, the sibling comparison and ordering data are published on this model page.

Key Takeaways

• Envelope: 224×135×175 mm, 13.7 ± 0.2 kg, C3 rating, φ11.8-M6 terminal, 6 cells per 12 V unit.
• Fixed charge control: 13.5 V float, 14.1 V equalise, 10.4 A maximum charge current, 1.75 V/cell cut-off.
• Repeatable arithmetic: 52 Ah × 12 V = 624 Wh per unit; a four-unit string holds 48 V × 52 Ah = 2,496 Wh nominal.
• Published limits: −15 °C to 50 °C operating window, ≤3 %/month self-discharge at 25 °C.
• Service life is a cycle range: 350–600 cycles at 50–80 % depth of discharge; float design life is not published for this model.
• Sourcing route: CHISEN runs 8 production bases at 70 million kVAh annual capacity with CE, ISO 9001, ISO 14001, UL and IEC certification, shipping from Shanghai and Ningbo.

§1 — 6-DMF-52 Quick Specifications

The verified data set for the 6-DMF-52 is below. Every row carries its source, so a procurement engineer can trace a figure to a factory document instead of a catalogue approximation.

Two entries deserve a flag. Design life is not published for the 6-DMF-52, so a quotation quoting a “10-year design life” for this model describes a different product class, not factory data. And the 350–600 cycle range is published against a 50–80 % depth-of-discharge band, so the spread is normal for VRLA. Note also the internal consistency: 52 Ah × 0.2 C = 10.4 A, exactly the published maximum charge current.

§2 — The Pain: Ordering VRLA Cells Without a Verifiable Data Sheet

The recurring failure in UPS and telecom procurement is not that the wrong cell is fitted. It is that the quotation, the datasheet and the pallet that arrives are three different documents. Importers in Lagos, Mombasa, Karachi, Chennai and Durban routinely receive batteries described as “12 V 52 Ah AGM” that are in fact a 51 Ah or 48 Ah variant with a different terminal diameter, and the mismatch surfaces only when the interconnects do not fit the bus bars already installed.

Three problems recur. Terminal mismatch. The 6-DMF-52 uses φ11.8-M6 posts — the same pattern as the 6-EVF-50, larger than the φ11.8-M5 used on the 6-DMF-45. A cabinet built around one diameter cannot accept the other without reworking the bus bars, and that rework costs far more than the cell. Setpoint drift. A charger programmed at 2.30 V/cell rather than the published 2.25 V/cell float shortens service life quietly, with no fault indication on the UPS panel. Capacity drift. Without a C3 rating confirmed on paper, a 52 Ah cell cycled at C10 delivers roughly 41 Ah in practice — a 21 % shortfall that appears as lost autonomy in the first week of operation.

Documentation is therefore the decisive lever, and the lowest-risk one. A buyer holding a published dimension drawing, a terminal drawing, a float and equalise setpoint and a charge-current limit has removed most of the commercial risk before a container is booked. What remains is physical: transit damage, reversed polarity on installation, improper float commissioning. Every data point above can be checked against a tape measure, a multimeter and the incoming packing list.

§3 — The Choice: Where the 6-DMF-52 Sits Against Its Siblings

The 12 V AGM range around the 6-DMF-52 is not a ladder of identical products. Each step changes three things at once — case footprint, terminal diameter and charge current — and understanding that is what prevents an expensive sizing error.

The immediate neighbours are the 6-DMF-45 at 45 Ah (224×121×175 mm, 12.3 ± 0.2 kg, φ11.8-M5) and the 6-EVF-50 at 50 Ah (230×140×180 mm, 15.25 ± 0.2 kg, φ11.8-M6). The 6-DMF-52 sits above both on capacity while keeping the φ11.8-M6 terminal of the 6-EVF-50. That is the most useful purchasing fact in this section: a cabinet built around φ11.8-M6 hardware accepts the 6-DMF-52 directly, so moving from 50 Ah to 52 Ah requires no bus-bar rework, only a revised load schedule.

Below that, the 6-DMF-38 at 38 Ah (224×106×175 mm, 10.45 ± 0.2 kg, φ9.8-M5) suits tighter cabinets, and the wider ordering picture across the 6-DZF, 6-DMF and 6-EVF series is set out on the full product range. Above it, the 6-EVF-60 at 60 Ah (258×170×160 mm, 18.8 ± 0.2 kg, φ14-M6) extends the ride-through window at the cost of a different terminal pattern.

The choice is arithmetic, not preference. If the calculated load on one 12 V string falls between 38 Ah and 52 Ah of sustained draw, the 6-DMF-52 gives the largest published capacity that still fits the φ11.8-M6 terminal pattern already in the rack. Below 38 Ah, the 6-DMF-38 on the sibling model page is the more efficient answer, because every cell carried above the required load is dead weight in the cabinet and dead capital on the invoice.

§4 — The Framework: A Five-Step Selection Method

Step 1 — Establish the load. Take the worst-case UPS load in kW at the rack, not the average, and convert it to current at the DC bus: I = P ÷ (12 × efficiency). For a 3 kW load at 90 % inverter efficiency: 3,000 W ÷ (12 V × 0.9) = 277.8 A at string level, so 277.8 A ÷ 6 cells in parallel = 46.3 A per cell. Against a 52 Ah cell at C3 that is a C1.12 discharge — inside the envelope, but no longer a C3 application, so runtime must come from the factory discharge table rather than a simple capacity division.

Step 2 — Size the string. A 12 V VRLA unit contains 6 cells in series. Four units in series give 48 V at the bus: 48 V ÷ 12 V = 4 units, and string capacity stays 52 Ah because series connection does not change the amp-hour rating. Stored energy is 48 V × 52 Ah = 2,496 Wh nominal per string.

Step 3 — Apply the ride-through target. For 15 minutes of autonomy at 277.8 A the energy needed is 277.8 A × 0.25 h = 69.45 Wh per string, so the nominal margin is 2,496 Wh ÷ 69.45 Wh = 35.9 times the requirement, before the 1.75 V/cell cut-off derating that every real installation applies. That margin is why 52 Ah cells are specified for short ride-through duties: the sizing is governed by the inverter, not by the battery.

Step 4 — Fix the charger. Float 13.5 V across the 6-cell unit = 2.25 V/cell; equalise 14.1 V = 2.35 V/cell; maximum charge current 10.4 A = 52 Ah × 0.2 C.

Step 5 — Check the mechanical and thermal envelope. Confirm the 224×135×175 mm case and 13.7 ± 0.2 kg mass against the rack shelf rating, and keep the installation inside −15 °C to 50 °C. Outside that band the published capacity figures no longer apply, so a conditioned room or a cabinet with forced air becomes a requirement.

§5 — 6-DMF-52 Against the Sibling 12 V AGM Models

The table sets the 6-DMF-52 against neighbouring published models using factory values only, so terminal pattern, charge current and case geometry can be checked against an existing installation before ordering.

Source: Model page (all rows).

Three readings follow. First, charge current scales with capacity at a constant 0.2 C: 38 × 0.2 = 7.6 A, 45 × 0.2 = 9.0 A, 52 × 0.2 = 10.4 A, 60 × 0.2 = 12.0 A, so a charger specified for the 6-EVF-50 class also charges a 6-DMF-52 string. Second, the φ11.8-M6 terminal is shared with the 6-EVF-50 but not with the 6-DMF-45, which uses the smaller φ11.8-M5 post. Third, case height is unchanged at 175 mm across the 6-DMF-38, 6-DMF-45 and 6-DMF-52, so all three fit the same shelf line while width grows by only 14 mm from 106 mm to 135 mm. All models share the published float of 13.5 V, equalise of 14.1 V, cut-off of 1.75 V/cell, self-discharge of ≤3 %/month at 25 °C and a −15 °C to 50 °C working range, so a mixed fleet runs on one charger profile.

§6 — The Trust: Factory Evidence Behind Every Figure

The specification set above is worth only as much as the production system behind it. CHISEN operates 8 production bases with an annual capacity of 70 million kVAh, and the export desk issues the datasheets, drawings and inspection records behind each figure quoted here. Product lines include flooded tubular OPzS2, gel tubular OPzV2 and the 12 V VRLA 6-DZF / 6-DMF / 6-EVF series, so a buyer who starts with the 6-DMF-52 can scale to larger formats without changing supplier. Factory certification covers CE, ISO 9001, ISO 14001, UL and IEC.

For import programmes the value is in the paperwork trail. CHISEN ships to distributors and project developers in India, Nigeria, Kenya, Vietnam, the Philippines, Brazil, Egypt, Mexico, Indonesia, Pakistan, Bangladesh, the UAE, Saudi Arabia, Turkey, South Africa and Thailand, with containers moving out of Shanghai, Ningbo, Shenzhen and Xiamen and onward through Jebel Ali, Karachi, Mumbai, Lagos, Mombasa, Durban, Cairo, Hamburg, Rotterdam, Antwerp and Santos. Each shipment can be issued with a packing list, an article-level item code, a declared net weight against the 13.7 ± 0.2 kg figure and a pallet photograph taken before it leaves the plant, so the customs broker and the installer can reconcile the delivery against the model page without guessing.

Two verification habits close the loop. On arrival, count the units against the packing list, measure the case with a tape rule against 224×135×175 mm and weigh a sample against 13.7 ± 0.2 kg; a batch that fails any of those three checks should be quarantined rather than energised. At commissioning, measure open-circuit voltage per unit, set the charger to 13.5 V float and 14.1 V equalise and confirm stable bus voltage. A stable 48 V confirms four units in series with the correct 6-cell configuration inside each — the arithmetic in §4 checks out at the terminals.

Fleet buyers who want documented endurance rather than nameplate capacity should request the factory discharge table, the cell-level test report and the warranty terms in writing before releasing the purchase order.

Design life is not published for the 6-DMF-52, so it should be requested from the factory rather than assumed. Design life is not published for the 6-DMF-52, so it should be requested from the factory rather than assumed.

§7 — FAQ

Q1: What are the published nominal voltage and capacity of the 6-DMF-52? The published values are 12 V and 52 Ah at a C3 rate, supplied as a 6-cell monobloc (Model page). Stored energy at the C3 rate is 52 Ah × 12 V = 624 Wh per unit.

Q2: What float and equalise setpoints does the manufacturer publish for the 6-DMF-52? Float 13.5 V and equalise 14.1 V across the 6-cell unit, which is 2.25 V/cell at float and 2.35 V/cell at equalise (Model page). Charge at the published values only.

Q3: What is the maximum charging current for the 6-DMF-52? 10.4 A, derived from 52 Ah × 0.2 C and consistent with the published figure (Model page). Typical UPS chargers are set well below this.

Q4: What are the case dimensions and weight of the 6-DMF-52? 224×135×175 mm (L×W×H) and 13.7 ± 0.2 kg (Model page). Check the 175 mm height against the rack shelf line before delivery.

Q5: What terminal type and torque does the 6-DMF-52 use? The published terminal is φ11.8-M6, shared with the 6-EVF-50 and larger than the φ11.8-M5 post used on the 6-DMF-45 (Model page). Terminal tightening torque is not published and should be requested from the factory.

Q6: How many cells does a 12V52Ah string contain and what bus voltage does it give? Each 12 V unit contains 6 cells in series. Four units in series give 48 V at the DC bus: 48 V ÷ 12 V = 4 units, with string capacity unchanged at 52 Ah, because series connection does not alter the amp-hour rating (Arithmetic on Model page data).

Q7: What is the published design float life of the 6-DMF-52 and at what temperature? Design life is not published for this model and should be requested from the factory. What is published is a cycle life of 350–600 cycles at 50–80 % depth of discharge, a self-discharge of ≤3 %/month at 25 °C and a working range of −15 °C to 50 °C (Model page).

Q8: How should an importer verify the 6-DMF-52 on delivery? Count the units against the packing list, measure the case against 224×135×175 mm and weigh a sample against 13.7 ± 0.2 kg. At commissioning, measure the open-circuit voltage of each unit and set the charger to 13.5 V float and 14.1 V equalise, then confirm stable bus voltage.

Q9: Which certifications does the CHISEN factory behind the 6-DMF-52 hold? CE, ISO 9001, ISO 14001, UL and IEC, with 8 production bases and 70 million kVAh of annual capacity (company factory data).

Q10: How do I request a quotation or samples for the 6-DMF-52? Send the model code 6-DMF-52 with your target quantity, destination port and required certification list to sales@chisen.cn or jack@chisen.cn, or message the export desk on WhatsApp +86 131 6622 6999. Factory-verified drawings, discharge data and test reports are issued with the quotation.

Expert Summary

The 6-DMF-52 is a 12 V 52 Ah VRLA AGM monobloc rated at C3, measuring 224×135×175 mm at 13.7 ± 0.2 kg, with φ11.8-M6 terminals, 13.5 V float and 14.1 V equalise setpoints, a 10.4 A maximum charge current, a 1.75 V/cell discharge cut-off, ≤3 %/month self-discharge at 25 °C and a −15 °C to 50 °C working range; published cycle life is 350–600 cycles at 50–80 % depth of discharge, while design life is not published and must be requested from the factory. Its position in the range is defined by what it shares and what it does not: the φ11.8-M6 terminal and charger class of the 6-EVF-50, the 175 mm shelf height of the 6-DMF-38 and 6-DMF-45, and 2 Ah more published capacity than the 6-EVF-50 at the same C3 rate. In arithmetic terms one unit stores 52 Ah × 12 V = 624 Wh, a four-unit series string holds 48 V × 52 Ah = 2,496 Wh nominal, and for a 3 kW UPS load at 90 % inverter efficiency the 277.8 A string current works out to 46.3 A per cell — inside a 52 Ah cell, but a C1.12 discharge that must be read from the factory discharge table rather than from a simple capacity division. The procurement conclusion: the 6-DMF-52 is correct when a calculated string load falls between 38 Ah and 52 Ah sustained draw and the cabinet already accepts φ11.8-M6 hardware; below that the 6-DMF-38 on the sibling model page is the leaner build, and above it the 6-EVF-60 extends autonomy with a different terminal pattern. Ordering detail for this model is published on this model page, and the wider series on the full product range.

Contact CHISEN — 24-Hour Response

CHISEN Battery, Hangzhou, China — 8 production bases, 70 million kVAh annual capacity, certified to CE, ISO 9001, ISO 14001, UL and IEC.

• Email: sales@chisen.cn
• Export desk: jack@chisen.cn
• WhatsApp: +86 131 6622 6999
• Website: www.chisen.cn

Request the factory-verified drawing, discharge table, test report and warranty terms for the 6-DMF-52 with your quantity and destination port, and the export desk will respond within 24 hours.

chisenbattery@gmail.com

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