Use the figure on the specification sheet for your specific model, and use a torque wrench. There is no universal value, it varies with terminal design, thread size and insert construction. Valen’s front terminal ranges are specified at 7 Nm (ENVIROX-CEL, ENVIROX-CELPLUS and TOPIN) and 10.3 Nm (ENDUROGEL).

Both errors cause failures:

Under-torqued connections have elevated resistance, which produces localised heating, accelerates terminal corrosion, and shows up in impedance testing as a fault that looks like a failing battery. Loose connections are one of the most common causes of “battery failure” that turns out not to be a battery failure at all.

Over-torqued connections strip or distort the terminal insert, which is not recoverable and usually voids warranty.

Practical points from the field:

• Terminal corrosion, cracked cases and electrolyte leakage are among the most frequently observed defects in Australian utility battery fleets, connection integrity is a maintenance item, not a one-time installation task.
• Re-torque at the first scheduled inspection after installation. Connections settle.
• Use an insulated torque wrench rated for the string voltage, and record the readings. On a bank where warranty may later be claimed, the record matters.

Extended warranty is available on request.

You will notice the gap between warranty and design life, 24 months against a 15-year design life on ENDUROGEL, for example. That gap is normal across the industry rather than unique to Valen, and it exists because the two things measure different risks: warranty covers manufacturing defect, while design life describes expected performance under specified conditions.

Australian specifiers for critical infrastructure routinely require both and treat them separately. A typical specification might ask for a design life over ten years alongside a twelve-month warranty. They are answering different questions.

What actually decides a claim is the conditions, so read those rather than the headline period:

• Ambient and cell temperature range the warranty assumes. This is where most claims fail. A long-design-life battery installed in a 45 °C cabinet has not failed prematurely in the manufacturer’s view. It has been operated outside the assumed conditions.
• Float voltage and temperature-compensation regime, and whether your charger actually delivers it. A charger without temperature compensation may itself be the reason a claim is declined.
• Evidence of a controlled charge regime. This is increasingly explicit in manufacturer warranty terms. Many manufacturers now require proof that the battery was operated within a controlled regime. Monitoring data is warranty evidence.
• Depth of discharge limits, and for lithium, throughput or cycle caps and battery management system firmware currency.
• Who bears freight and labour on a warranty replacement to a remote site. On a site four hours from a depot this can exceed the value of the battery.
• What documentation is required at claim time: commissioning records, discharge test results, monitoring logs, service history.

The most useful thing you can do at installation is start the evidence file: commissioning readings, baseline impedance, and the temperature record. It costs an hour and it is the difference between a complaint and a case.

4. SOLiCORE 48V 100Ah Semi-Solid State LiFePO₄ Rack Mount Battery

Page: https://valen.com.au/shop/lithium-batteries/valen-solicore-solid-state-lithium-batteries/valen-solicore-48v-100ah-solid-state-lifepo4-rack-mount-battery/ Questions: 17 · First six above the spec table URL stays as-is. No redirect required.

4.1 Two page edits required before the FAQ goes live

Edit 1, remove the following text from the product description:

“Solid‑State Safety: No liquid electrolyte, offering higher stability, no fire/smoke risk, and safer operation.”

Replace with:

“Semi-Solid State Safety: a composite polymer electrolyte with substantially reduced free liquid electrolyte, delivering higher thermal stability and improved abuse tolerance compared with a conventional lithium cell. Certified to IEC 62619, UN 38.3 and UL 1973, and tested to UL 9540A.”

Edit 2, replace “solid state” with “semi-solid state” in the visible body copy and headings on this page. The product name, the URL and the page slug stay unchanged; this is a body-copy change only. The FAQ below explains the distinction, which is deliberate. It is a credibility asset, not a concession.

4.2 Specification summary: please publish on the page

4.3 FAQ

Industrial lead-acid is recycled through the established commercial scrap-lead route, which has been economically self-sustaining for decades because of the scrap value of lead. Practically, a supplier or a licensed recycler collects the old batteries and provides documentation. Valen Power is certified to ISO 14001:2015 for environmental management, covering the provision of industrial batteries, energy storage and training services.

Note what is not covered by the schemes people assume cover everything. B-cycle, Australia’s government-backed battery stewardship scheme, and the new NSW mandatory scheme under the Product Lifecycle Responsibility Regulation 2026, which commences 1 October 2026 and under which significant penalties apply, are both scoped to portable batteries: household sizes, button cells, removable rechargeable batteries under 5 kg, e-micromobility and power banks. Industrial stationary lead-acid is expressly outside both.

Industrial lithium is the genuine gap. There is no mandatory scheme covering a large lithium bank at end of life, and the dangerous goods requirements for damaged or end-of-life lithium make informal disposal legally hazardous rather than merely untidy.

What to ask any supplier, and what a well-run programme should provide:

1. Documented take-back with a chain-of-custody record, not a verbal assurance that “we’ll take them away”.
2. Correct classification, packaging and marking for lithium removals, especially where units are damaged or failed.
3. A disposal certificate you can put in an environmental compliance file.

For Valen’s VRLA front terminal ranges, ENDUROGEL, ENVIROX-CEL, ENVIROX-CELPLUS and TOPIN, yes. The electrolyte is immobilised, the batteries are classified non-spillable and approved for air transport under IATA packing instructions, subject to correct packaging, marking and terminal protection. This matters more than it sounds for remote-site work, where the difference between air freight and road freight can be a week and a shutdown window.

For ENLiFEN lithium products the position is different and stricter. Lithium batteries are dangerous goods for air transport, classified UN 3480 or UN 3481, Class 9, and every cell or battery must be of a type proved to meet the tests in the UN Manual of Tests and Criteria, Part III, sub-section 38.3 before it can be transported.

Raise this early on any lithium project at a remote site: a failed or end-of-life lithium battery is a harder logistics problem than a working one. Damaged or defective units must be marked “DAMAGED/DEFECTIVE LITHIUM-ION BATTERIES” and packed to specific packing instructions. Batteries for disposal or recycling carry their own marking and packaging requirements. Different packaging, different marking, potentially a different carrier. Lead-acid has no equivalent burden. If you are specifying lithium for a site three hours from a highway, plan the removal at the same time as the installation.

Temperature is the dominant variable in Australian industrial battery life, and it is under-modelled almost everywhere.

The relationship. EUROBAT states that float operation above 20 °C reduces VRLA life expectancy by approximately 50% for every 10 °C of sustained increase. Applied to a 15-year design-life battery: roughly 7.5 years at 30 °C, roughly 3.75 years at 40 °C. And once heat has damaged a battery, the lost capacity cannot be recovered. This is not a reversible derating.

Where this bites in Australia. Pole-top and pillar enclosures, roadside ITS cabinets, rail location cases and unairconditioned kiosks are sun-loaded, unventilated and routinely run internal temperatures far above the 20–25 °C at which design life is quoted. That is why they are the highest-churn small-battery population in most utility and road networks. AusNet’s field experience is that a 12-year useful life becomes “as low as 10 years” where the environment is not temperature controlled, and a zone substation kiosk is a much milder environment than a roadside cabinet.

Cold matters too, in the other direction. Capacity falls with temperature: AS/NZS 4509.2 provides derating curves for lead-acid from −10 °C to +40 °C with correction factors running roughly 60% to 105%. A bank sized for its nameplate capacity will underdeliver on a cold morning.

What to do about it, in order of effect:

1. Measure the actual temperature in the enclosure, in February, at the terminals, not the ambient air temperature from the nearest weather station.
2. Specify temperature-compensated charging. Non-negotiable in an uncontrolled environment.
3. Address the enclosure. Australian road authorities have engineered around this explicitly: TMR’s MRTS213 requires double-skinned cabinets with thermostatically controlled fans and a heater, white heat-reflective paint to AS 2700, and internal temperature held between 0 °C and 50 °C.
4. Then choose the battery, and derate the design life honestly for the temperature you measured, rather than quoting the 20 °C figure.

Always check the rate. A 100 Ah battery at C₁₀₀ is not a 100 Ah battery at C₁₀, and comparing two batteries at different rates is the single most common sizing error in this category.

The C-rating states the discharge period over which the capacity was measured. A battery rated 100 Ah at C₁₀ can deliver 10 A for 10 hours. The same battery rated at C₁₀₀ might show 120 Ah or more, because a slower discharge extracts more energy. Conventions by application:

We publish both figures in the specification table above so you can see the effect directly: the ENVIROX-CELPLUS 190 Ah rates 205.2 Ah at C20, and the ENVIROX-CEL 155 Ah rates 167 Ah at C20. Most suppliers publish whichever number suits them. Comparing a nameplate figure against a C20 figure will mis-size a bank by ten per cent or more.

The second variable, equally important and more often omitted, is the end-of-discharge cut-off voltage. The same battery quoted to 1.75 V per cell and to 1.80 V per cell will show different capacities. Two suppliers can quote identical amp-hours at identical C-rates and still not be comparable if the cut-off differs.

For telecom applications there is a hard constraint here. ETSI EN 300 132-2 sets the normal −48 V interface range at −40.5 V to −57.0 V. With 24 lead-acid cells, the −40.5 V floor corresponds to about 1.69 V per cell at the equipment terminals, before distribution voltage drop. This is precisely why telecom reserve tables are quoted to 1.75 V or 1.80 V per cell rather than to a flat battery, and why “how many amp-hours” is the wrong question. The right question is how many minutes at my actual load, to my actual end voltage, at my actual cabinet temperature, at end of life.

Thermal runaway is a self-reinforcing loop: elevated temperature increases charge current acceptance, the increased current generates more heat, the higher temperature increases current further. Left unchecked it dries the cell, deforms the case and can vent or rupture it.

This is a recognised failure mode in utility battery fleets managing critical infrastructure—not theoretical. It occurs when cells are over-charged by float voltage intended for the string as a whole, particularly where a weak cell sits in the circuit. This is why monitoring charge voltage and cell-level temperature on critical VRLA banks is standard practice.

The three contributing conditions are almost always present together:

1. High ambient temperature. Risk rises steeply above 40 °C.
2. A charger without temperature compensation, holding a float voltage appropriate for 20 °C at a cell that is at 45 °C.
3. An aged or damaged battery with reduced internal resistance and impaired recombination.

Prevention is unglamorous and effective:

• Temperature-compensated charging. This is now the modern standard in utility specifications. Many existing charger fleets lack the functionality, but current standards require it.
• Keep the battery below 25 °C where you can, and if you cannot, derate the expected life accordingly rather than being surprised.
• Monitor cell or monobloc temperature, and alarm on it. Critical infrastructure battery specifications typically require temperature logging at 15-minute intervals with high-temperature warning and over-temperature shutdown.
• Replace on condition, not on failure. An aged bank is the substrate the fault needs.

Note also that AS 60896.22 requires the manufacturer to provide thermal runaway sensitivity information. It is a disclosure requirement, not an immunity claim, but it means you are entitled to ask for the data, and comparing it across suppliers is a legitimate procurement question.

You can, but in most cases you should not and the reason is duty cycle rather than quality.

A standby battery, AGM front terminal designed for UPS or telecom float service, spends its life at full charge and is discharged rarely. Its plate design, separator and charge regime are optimised for that. A solar or off-grid battery is discharged and recharged every single day, often deeply. Put a standby AGM on a daily cycling duty and it will deliver a fraction of its rated life: a typical VRLA discharged to 100% of capacity each cycle manages around 300 cycles, where the same battery at 30% depth of discharge manages around 800. Neither is a ten-year outcome on a daily cycle.

If you want lead-acid for a cycling application, the right products from Valen’s range are ENDUROGEL (gel, better deep-discharge tolerance and cycle life) or ENVIROX-CEL / ENVIROX-CELPLUS (carbon-enhanced AGM, designed for partial-state-of-charge operation). If the application is a genuine daily cycling duty with meaningful depth of discharge, ENLiFEN LiFePO₄ is usually the better whole-of-life answer, 6,000 cycles at 80% depth of discharge rather than hundreds.

This question comes up constantly. A standby battery on a cycling duty will work for a while and then underperform. Specify for the duty, not the price.

Yes, less than a flooded cell, but not none. VRLA batteries recombine most of the gas produced internally, which is why they are described as sealed and require no watering. But recombination is not perfect, and under over-charge, high temperature or fault conditions the pressure relief valves vent hydrogen. Hydrogen is flammable in air at concentrations above roughly 4%.

The requirements in Australia sit in AS 2676 for installation, maintenance and testing of secondary batteries in buildings, and AS 3011 for the electrical installation. Rail applications carry the same obligation, ARTC’s signalling power systems standard requires battery housing ventilation to comply with AS 2676.

What this means in practice:

• Enclosures need a designed air path, not just a gap. A sealed IP-rated cabinet with no ventilation provision and a battery bank inside it is a design error.
• Hydrogen accumulation is a function of charge regime and temperature, so a charger without temperature compensation increases the ventilation requirement as well as shortening battery life.
• Where a dedicated battery room is used, note that AS/NZS 5139 Amendment 1 (2025) introduced a formal definition, a garage or storeroom does not qualify.

If you are retrofitting a larger bank into an existing enclosure, the ventilation calculation should be revisited. It scales with the bank.

Battery end-of-life and testing approaches.

The industry convention is end of life at 80% of rated capacity—the point at which the battery can no longer be relied on to deliver its specified runtime. This is applied explicitly across critical infrastructure.

Three approaches to determining end of life, in increasing order of reliability:

Age-based. Simple but crude. Most fleets use it. Typical replacement ages for VRLA are 12 years for 2 V cells and 8 years for 12 V monoblocs—note the significant difference in lifespan between cell types.

Impedance or conductance trend. Fast, non-invasive, performed on a live bank. Reliably catches open cells, dry-out and connection degradation. Rising impedance correlates with capacity fade. Requires a baseline reading from when the bank was new; without one, you are comparing to a manufacturer’s typical value rather than to this bank’s actual history.

Timed discharge test. The only direct measurement of capacity. Everything else is inference.

One critical point: impedance is a trend indicator, not a capacity measurement. Discharge testing on single-bank substations is often impractical, which is why effective asset management pursues continuous cell monitoring and capacity test methods in combination, not one instead of the other.

It is the ENLiFEN 48 V 75 Ah lithium front terminal pack (ELFT4875322), a LiFePO₄ battery in a front terminal format, 530 mm long (560 mm including handles) × 125 mm × 330 mm, 34 kg, M8 terminals, rated at 6,000 cycles to 80% depth of discharge.

It exists because some applications need a 48 V bus in a front terminal footprint rather than four 12 V monoblocs in series. The advantages over a series string of four 12 V batteries:

• One battery management system, rather than four independent units with no cell-level balancing between them
• A single set of connections, rather than three inter-unit links
• One third of the weight of an equivalent VRLA arrangement
• Thousands of cycles rather than hundreds

See our published case study on how this product is used to improve network reliability in the field: Enhancing network reliability with Valen’s lithium battery solution.

Usually not, and this is the most commonly misapplied standard in the Australian battery market.

AS/NZS 5139:2019 covers battery systems used with power conversion equipment, 12 V to 1500 V DC, capacity 1 kWh to 200 kWh. It explicitly excludes:

• telecommunication applications
• uninterruptible power systems in accordance with AS 62040
• premises with critical power continuity requirements, such as acute care hospitals
• electric vehicles, portable equipment and transportable structures

So a battery bank in a telecom cabinet, a UPS battery string in a data centre, and a substation DC tripping battery are generally not governed by 5139. What governs them instead is AS 3011 and AS 2676 for installation, maintenance and testing, AS 4044:2024 for the charger, AS 60896.22:2023 for the product, and AS 62040 for the UPS itself.

Why it matters in both directions: applying 5139 where it does not belong adds cost, clearance requirements and delay to a project that does not need them. Missing it where it does apply, a battery energy storage installation in a building, fails inspection.

Almost no content in this space gets this right, because most of it is written for residential solar and then reused for industrial applications. If you are being told a telecom battery installation needs a 5139-compliant battery room, ask which clause.