The cited company's 2026 interim report illustrates why total automotive lead-acid volume should not be used as a direct proxy for every battery segment. The report states that its first-half automotive low-voltage lead-acid battery sales declined year on year, while its AGM start-stop battery sales increased. These figures describe the cited company's reporting scope, not a national or global AGM market forecast.
For battery manufacturers, start-stop demand is not only a volume question. Frequent restarts, electrical loads with the engine off and partial-state-of-charge operation make the validation window more specific. An AGM separator should therefore be evaluated as part of the plate group and complete battery system—not as an isolated guarantee of cycle life or vehicle performance.
Market signal
Read automotive demand by product segment, not total KVAH alone
The cited company reported 17.99 million KVAH of automotive low-voltage lead-acid battery sales for the first half of 2026, down 6.12% year on year. Its report also disclosed differing movements in OEM, replacement and start-stop products. The useful procurement conclusion is limited: a decline in total volume does not automatically translate into the same change for every separator specification, customer program or battery route.
Start-stop duty
Start-stop batteries face more than one cranking event
Compared with a conventional starter battery, a start-stop battery can experience repeated engine restarts, engine-off electrical loads, partial-state-of-charge operation and, in some vehicles, regenerative-braking-related charging. AGM and EFB address different levels of duty and recovery requirements. The original battery route and target duty cycle must be confirmed; the two technologies are not automatically interchangeable.
Separator role
Repeated cycling makes material conditions more visible
In a VRLA-AGM battery, the separator keeps the plates apart, retains electrolyte and provides an ion-transport path. Plate-group compression also affects electrolyte distribution and oxygen-transport conditions. Under repeated discharge and recovery, small differences in wetting, compressed condition or dimensions can become more visible. That does not make the separator the sole determinant of battery performance; plate design, active material, acid quantity, charging strategy and thermal conditions remain part of the same validation system.
Measurement conditions
A thickness value needs its test pressure
Nominal dry thickness is an incoming-material measurement, not the complete condition inside a filled and compressed battery. The relevant compression range depends on plate thickness, assembly clearance and the design target. For automotive AGM projects, procurement and engineering teams should state the measurement pressure alongside the target thickness and use comparable sample preparation and test methods when comparing suppliers or batches.
Consistency
Batch variation carries into assembly
Differences in basis weight, thickness under an agreed pressure, dimensions or roll condition may be adjusted during sampling but become more consequential in continuous assembly. They can increase line adjustment, change plate-group condition and raise the cost of quality control. The practical objective is to reproduce the agreed material condition from samples through pilot work and later production batches.
Procurement checklist
Confirm the same specification across purchasing, engineering and production
Before sampling or introducing an AGM separator, align the original battery route, plate dimensions, separator format, target thickness and test pressure. Also define the acid-filling and formation conditions that require coordination, the planned incoming checks, and the batch-identification, packaging and feedback records expected for sample, pilot and volume material. These checks support—not replace—complete-battery validation.
Viking coordination
Begin with material conditions that can be tested and reproduced
Viking Technology manufactures AGM glass-fiber separators for VRLA lead-acid battery applications and can discuss rolls or sheets, thickness, width, sheet dimensions and packaging. For automotive AGM programs, we can align material-level conditions such as thickness under an agreed pressure, basis weight, absorption-related testing, dimensions, roll condition and incoming-inspection methods. Dynamic charge acceptance, temperature resistance, cycle life and vehicle compatibility must still be confirmed by the customer through complete battery design and testing.
Battery route
Confirm the original AGM or EFB route and whether the project serves OEM or replacement use.
Compression condition
State target thickness together with measurement pressure, sample state and agreed method.
Assembly inputs
Align plate dimensions, roll or sheet format, acid filling and formation conditions.
Batch evidence
Define incoming checks, batch identification, packing and feedback records for each project stage.
