Quick answer: There is no single best industrial VRLA battery brand. The Stryten Absolyte AGP is a 2V modular sealed AGM with a 20 year design life, IEEE 535 Class 1E and IEEE 693 seismic qualification, and a made in USA GNB Absolyte heritage, which makes it the strong pick for legacy GNB Absolyte sites, seismic and Class 1E duty, and domestic content procurement. EnerSys, C and D, and NorthStar are capable alternatives that fit different priorities: EnerSys for global service and distribution, NorthStar Blue+ for fast front access telecom swaps, and C and D for pure lead high rate UPS. Match the battery to the application, and CPBS will help you do it.
Key points
- This guide compares brands once you have already chosen VRLA lead acid. It owns the inter brand decision, not chemistry. For AGM versus flooded, lead acid versus lithium, lifecycle cost, or single product depth, follow the linked guides.
- The decision usually comes down to six axes: cell format, design life, certifications, domestic US manufacturing, footprint and serviceability, and support model. The head to head table below lines all four brands up against those axes.
- Stryten Absolyte AGP is a 2V large format modular AGM and the direct, like for like successor to the GNB Industrial Power Absolyte GP and IIP line. That heritage and its IEEE 535 Class 1E and IEEE 693 qualification are its sharpest differentiators.
- Be clear on the names. NorthStar is now an EnerSys brand, and NorthStar Blue+ is a front access monobloc, not a 2V modular cell. The Absolyte name in the US belongs to the GNB to Stryten lineage, while Exide Group holds it in Europe. EnerSys does not make the US Absolyte line.
- Every competitor figure here is sourced to a public datasheet or stated at the category level. Where a number is not verified, this guide describes the difference instead of inventing a spec.
If you have already decided on valve regulated lead acid (VRLA) for a data center uninterruptible power supply (UPS) string, a telecom plant, a utility substation, or an industrial backup system, the next question is which brand. This guide compares the Stryten Absolyte AGP, a sealed recombinant VRLA AGM made in the USA by Stryten Energy (formerly GNB Industrial Power, a division of Exide Technologies), against the industrial standby batteries buyers most often cross shop: EnerSys PowerSafe and DataSafe, C and D Technologies, and NorthStar. Critical Power Battery Solutions (CPBS), the battery division of Advanced Technical Services Inc. (ATS), is an authorized Stryten reseller, so we are not neutral about Stryten. What we can promise is an honest, like for like comparison: where the Absolyte AGP is the right answer, and where a competitor reasonably is.
Who this comparison is for
This comparison is for engineers and procurement teams who have chosen VRLA and now have to defend a brand choice for a mission critical backup system. It speaks to the people who own the decision:
- Data center and facilities engineers specifying or replacing UPS battery strings.
- Telecom and central office engineers sourcing front terminal or modular plant batteries.
- Utility substation protection and control engineers qualifying a station battery to an approved vendor list.
- Industrial maintenance and reliability leads standardizing backup power across a plant.
Many readers run a legacy GNB or Exide Absolyte string and want to know whether to stay in the Absolyte family or switch brands. Others are starting clean and want a defensible reason to pick one manufacturer over another. Either way, the useful comparison is not a winner declared in the abstract, but a match between the battery and your application, certifications, footprint, and support needs. That is what this guide is built to do.
How to use this comparison
Use the comparison axes to narrow the field, then use the head to head table to see how the four brands line up, and finally use the selection framework near the end to route your specific application to a choice. A few ground rules keep the comparison honest and keep this post in its lane.
- Like compared with like. A 2V large format modular cell, a front terminal monobloc, and a thin plate pure lead block are different tools. The table notes the format for each so you are not comparing a substation cell to a telecom monobloc as if they were the same thing.
- Verified or category level only. The Absolyte AGP column carries Stryten published values. Competitor cells use the manufacturer public datasheet where a figure is confirmed, or a category level description where it is not.
- One job per guide. This post owns the inter brand VRLA comparison. The chemistry and cost questions are owned by dedicated guides: the Absolyte AGP versus flooded E-Series guide for AGM versus flooded, the lead acid versus lithium comparison for chemistry class, the Absolyte total cost of ownership analysis for lifecycle cost, and the Absolyte AGP specifications by application library for full spec data.
The comparison axes that decide the brand
Six axes carry almost all of the brand decision for an industrial VRLA battery. Get clear on where your application sits on each one and the field narrows quickly.
- Cell format. 2V large format modular cells (Absolyte AGP, C and D msEndur II), 2V cells or front terminal monoblocs (EnerSys PowerSafe and DataSafe), or front access pure lead monoblocs (NorthStar Blue+). Format drives footprint, string design, and how you service it.
- Design life. Premium 2V industrial lines commonly carry a 20 year design life at 25°C. Service life always depends on temperature and maintenance, so treat design life as a rating, not a guarantee.
- Certifications. NEBS Level 3 for telecom, IEEE 535 Class 1E for nuclear and high reliability duty, IEEE 693 for seismic zones, and a UL94 V-0 flame retardant case. These separate a substation or Class 1E grade battery from a general purpose one.
- Domestic US manufacturing. Matters for federal, utility, and Buy American influenced procurement. Confirm country of origin on the actual order rather than assuming it from the brand.
- Footprint and serviceability. Front access monoblocs swap fast in a telecom rack; 2V modular cells pack large capacity into a substation or data center lineup. Match the form factor to the maintenance reality of the site.
- Support model. A global OEM sells from a catalog with a wide service footprint; a consultative authorized reseller sizes the battery to your duty cycle and owns the documentation. Both have a place.
For the sizing math behind the design life and footprint axes, the VRLA battery sizing guide covers the IEEE 485 method, and the utility substation battery selection guide shows how these axes play out in a substation DC system.
Head to head: Absolyte AGP vs PowerSafe and DataSafe vs C and D vs NorthStar Blue+
The table below lines the four brands up against the axes that decide the choice. Absolyte AGP values are Stryten published figures. Competitor cells are sourced to the manufacturer public datasheet or described at the category level, with no invented numbers.
| Axis | Stryten Absolyte AGP | EnerSys PowerSafe / DataSafe | C and D msEndur II | NorthStar Blue+ (EnerSys) |
|---|---|---|---|---|
| Cell format | 2V large format modular cells in steel trays | 2V cells (PowerSafe SBS) and front terminal monoblocs (DataSafe, SBS front terminal) | 2V large format modular cells | 12V front access (front terminal) monobloc |
| Plate and chemistry | Sealed recombinant VRLA AGM, flat plate | VRLA AGM portfolio, including thin plate pure lead (TPPL) in the SBS line | Pure lead AGM (flat plate) | Thin plate pure lead with carbon, AGM |
| Design life at 25°C | 20 year design life (Stryten published) | Long life lines available; verify per series datasheet | 20 year design life (C and D published) | Long life telecom monobloc; verify per datasheet |
| Certifications and qualification | IEEE 535 Class 1E, IEEE 693 seismic, NEBS Level 3, UL recognized, UL94 V-0 | Varies by series; confirm Class 1E and seismic on the specific datasheet | Varies by series; confirm on the specific datasheet | Telcordia and NEBS telecom compliance; confirm seismic per datasheet |
| Domestic US manufacturing | Made in USA by Stryten Energy | Global manufacturer; confirm origin per order | US manufacturer | EnerSys brand, global supply; confirm origin per order |
| Footprint and serviceability | Large capacity modular trays for substation and data center lineups | Front terminal options for rack service; broad capacity range | Space saving modular 2V for UPS and telecom | Front access monobloc, fast swaps in telecom racks |
| Legacy GNB Absolyte path | Direct, like for like GNB Absolyte GP and IIP successor | Not an Absolyte successor | Not an Absolyte successor | Not an Absolyte successor |
| Support model | Consultative authorized reseller (CPBS sizes and documents) | Global OEM with wide service and distribution | OEM and distributor network | EnerSys distribution and support |
Read the table as a routing tool, not a scoreboard. A site that needs fast front access telecom swaps and a site that needs a seismically qualified substation cell will land on different brands, and both answers can be correct.
Where Stryten Absolyte AGP is the strongest fit
The Absolyte AGP is the strong pick in four situations where its heritage and qualification pedigree do real work.
- Legacy GNB or Exide Absolyte sites. The Absolyte AGP is the direct successor to the GNB Industrial Power Absolyte GP and IIP line, so an aging Absolyte string gets a like for like, made in USA path forward. If you are asking whether GNB batteries are still available, this is the continuity answer.
- Seismic and Class 1E duty. IEEE 535 Class 1E and IEEE 693 seismic qualification is a high bar that not every competitor line carries end to end. For nuclear adjacent, utility substation, and high reliability sites, that pedigree is the differentiator.
- NEBS telecom environments. NEBS Level 3 with a UL94 V-0 flame retardant case suits central office and telecom plant duty.
- Domestic content procurement. Made in USA by Stryten Energy supports federal, utility, and Buy American influenced sourcing, with country of origin documentation available from CPBS.
If you want the standalone depth on the Absolyte AGP itself rather than the comparison, the Absolyte AGP battery review covers the product in detail, and the Absolyte lifespan guide explains design life versus service life.
Where a competitor may be the better choice
Being an authorized Stryten reseller does not mean Stryten wins every time. Three competitor strengths are real, and an honest comparison names them.
- EnerSys for global service footprint. EnerSys is the global market leader in reserve power, with a broad portfolio across PowerSafe, DataSafe, and other lines and a wide distribution and service network. For a multinational footprint or a site that values a single global supplier, that scale is a genuine advantage.
- NorthStar Blue+ for fast telecom swaps. The NorthStar Blue+ is a front access monobloc built on thin plate pure lead with carbon, designed for fast recharge and partial state of charge cycling in telecom plants. When the maintenance reality is quick front access swaps in a 19 or 23 inch rack, a front access monobloc can beat a 2V modular lineup.
- C and D for pure lead high rate UPS. The C and D msEndur II is a pure lead AGM with strong high rate performance and a space saving modular 2V design, a capable choice for high rate UPS duty.
The point is not that these are weak alternatives. It is that each one fits a particular priority. Where your priority is a like for like Absolyte successor, seismic or Class 1E qualification, or made in USA sourcing, the Absolyte AGP leads. Where it is global single vendor service or a front access telecom monobloc, a competitor may serve you better, and CPBS will tell you so.
Format matters: 2V modular cells, monoblocs, and pure lead
Cell format is the most misunderstood part of an industrial VRLA comparison, so define the terms before you compare. The three formats are built for different jobs.
- 2V modular cell. A single large format 2 volt cell, wired in series to build a 24, 48, or 125 VDC string. It packs high capacity into a substation or data center lineup and is the Absolyte AGP and C and D msEndur II format.
- Monobloc. A multi cell block, typically 12V, often with front terminals for rack service. The NorthStar Blue+ and many EnerSys DataSafe units are monoblocs, well suited to telecom and switchgear racks.
- Pure lead and thin plate pure lead (TPPL). A plate technology, not a separate format, using high purity lead for high rate performance, fast recharge, and good partial state of charge tolerance. NorthStar Blue+ and the EnerSys PowerSafe SBS line use TPPL; C and D msEndur II is a pure lead AGM.
- Recombinant oxygen cycle. The sealed VRLA mechanism shared by all of these batteries that recombines charge gas internally, so they are low maintenance and nonspillable compared with flooded cells.
Two naming facts matter here, because buyers mix them up. First, NorthStar is now an EnerSys brand, acquired by EnerSys in 2019, and the Blue+ is a front access monobloc, architecturally different from the Absolyte AGP 2V modular cell. Second, the Absolyte name is not an EnerSys product in the US. The US Absolyte line runs from GNB Industrial Power to Stryten Energy, while Exide Group holds the Absolyte name in Europe. EnerSys does not make the US Absolyte battery, so do not let a parts search conflate an EnerSys catalog with the Stryten Absolyte AGP. When you need to confirm you are buying authentic Stryten stock, the authorized Stryten distributor verification guide walks through it.
Certifications decoded: NEBS, IEEE 535, IEEE 693, UL94 V-0
Certifications are where a comparison gets decisive, because they map to where the battery is allowed to go. Here is what each one means and when it matters.
- NEBS Level 3. Network Equipment Building System criteria for telecom central office equipment, covering environmental and safety performance. It matters for telecom and central office deployment.
- IEEE 535 Class 1E. Qualification of Class 1E lead storage batteries for nuclear power generating stations. It is a high reliability pedigree that matters for nuclear adjacent and the most safety critical duty.
- IEEE 693 seismic. Recommended practice for seismic design of substations, the basis for seismic qualification of substation batteries. It matters in seismic zones and for utility substation projects.
- UL94 V-0. A flame retardant rating for the case material, evidence the container resists ignition and self extinguishes. It matters anywhere fire performance is specified.
The Absolyte AGP carries IEEE 535 Class 1E, IEEE 693 seismic, NEBS Level 3, UL recognition, and a UL94 V-0 case across the line. Competitor lines carry various qualifications, and the honest instruction is the same for every brand including Stryten: confirm the specific certification on the specific model datasheet for your project, because a qualification on one series does not automatically extend to another.
A brand selection framework
Answer these questions in order and the field narrows to a clear choice for your site.
- Are you replacing a legacy GNB or Exide Absolyte string? If yes, the Absolyte AGP is the like for like, made in USA successor and the default answer.
- Do you need IEEE 535 Class 1E or IEEE 693 seismic qualification? If yes, shortlist lines that carry it across the model, which is a strength of the Absolyte AGP.
- Is the maintenance reality fast front access swaps in a telecom rack? If yes, a front access monobloc such as NorthStar Blue+ or an EnerSys DataSafe unit deserves a look.
- Is a single global supplier with a wide service footprint the priority? If yes, EnerSys scale is a real advantage.
- Is made in USA or domestic content sourcing required? If yes, confirm country of origin on the order; the Absolyte AGP is made in the USA by Stryten Energy.
- Is the duty high rate UPS in a tight footprint? If yes, pure lead lines such as C and D msEndur II or EnerSys PowerSafe SBS are built for it.
Most real decisions are a blend of these, which is exactly where a consultative supplier helps. The Stryten E-Series selection guide shows the same routing approach within the Stryten flooded line, and the companion utility substation Absolyte AGP guide applies it to a substation DC system.
How to compare options with CPBS
Tell us your application and the brands you are weighing, and CPBS will give you a straight comparison and a sized Absolyte AGP recommendation where it fits. Send four things:
- The application (data center UPS, telecom plant, utility substation, industrial backup).
- The DC system (bus voltage, runtime or autonomy, and the load).
- Any certification requirement (NEBS, IEEE 535 Class 1E, IEEE 693 seismic, domestic content).
- The brands you are cross shopping so we can compare like with like.
Send it to Tom Kierna, who has more than 40 years in industrial batteries including 15 at GNB and Stryten, at 630-984-9718 or sales@criticalpowerbatterysolutions.com, or start with the before your battery sizing consultation checklist and the contact page. If the right answer for your site is a competitor, we will say so. Where it is the Absolyte AGP, you get the battery, the sizing, and the documentation from one authorized source.
Frequently asked questions
What is the best industrial VRLA battery brand?
There is no single best industrial VRLA battery brand; the best fit depends on the application, the cell format, the certifications you need, and the support model. Stryten Absolyte AGP leads for legacy GNB Absolyte sites, seismic and Class 1E duty, and made in USA sourcing. EnerSys, C and D, and NorthStar each fit other priorities. Match the battery to the job rather than chasing one brand.
How does Stryten Absolyte AGP compare to EnerSys PowerSafe?
Both are capable industrial VRLA AGM batteries, but they differ in format and pedigree. The Absolyte AGP is a 2V large format modular cell with IEEE 535 Class 1E and IEEE 693 qualification and a made in USA GNB Absolyte heritage. EnerSys PowerSafe spans 2V cells and front terminal monoblocs, including thin plate pure lead, with a global service footprint. The right pick depends on format, certifications, and support priorities.
Is Absolyte AGP the same as EnerSys Absolyte?
No. The Absolyte name in the US belongs to the GNB to Stryten lineage, and the current maker is Stryten Energy, not EnerSys. Exide Group holds the Absolyte name separately in Europe. EnerSys does not make the US Absolyte line. If a search mixes EnerSys results with Absolyte, treat them as different products and confirm you are sourcing genuine Stryten Absolyte AGP stock.
What is the difference between 2V modular cells and monobloc batteries?
A 2V modular cell is a single large format cell wired in series to build a string; a monobloc is a multi cell block, usually 12V, often with front terminals. Modular 2V cells, such as the Absolyte AGP, pack high capacity into substation and data center lineups. Monoblocs, such as NorthStar Blue+, favor fast front access service in telecom racks. The formats suit different applications.
How does Absolyte AGP compare to C&D Technologies batteries?
The C&D msEndur II and the Stryten Absolyte AGP are both 2V modular pure lead or AGM industrial batteries with long design lives, so they are close architectural peers. The msEndur II is a pure lead AGM strong in high rate UPS. The Absolyte AGP adds IEEE 535 Class 1E and IEEE 693 qualification and the GNB Absolyte successor path. Choose on certifications, legacy fit, and sourcing.
Is NorthStar the same company as EnerSys?
NorthStar is now part of EnerSys, which acquired NorthStar Battery Company in 2019. NorthStar continues as an EnerSys brand, and the NorthStar Blue+ is a front access thin plate pure lead monobloc popular in telecom. It is architecturally different from the Stryten Absolyte AGP 2V modular cell, so compare them by application rather than treating them as interchangeable.
Which industrial standby battery is made in the USA?
The Stryten Absolyte AGP is made in the USA by Stryten Energy, which supports domestic content procurement. C and D is a US manufacturer as well. EnerSys and NorthStar are global suppliers with US and international manufacturing. Because origin can vary by line and order, confirm country of origin on the actual purchase rather than assuming it from the brand name.
What certifications separate industrial standby batteries?
The certifications that separate industrial standby batteries are NEBS Level 3 for telecom, IEEE 535 Class 1E for high reliability and nuclear duty, IEEE 693 for seismic zones, and UL94 V-0 for the case. The Absolyte AGP carries all of these across the line. Competitor lines carry various qualifications, so confirm the specific certification on the specific model datasheet for your project.
Can I replace legacy GNB Absolyte batteries with Stryten Absolyte AGP?
Yes. The Stryten Absolyte AGP is the direct successor to the GNB Industrial Power Absolyte GP and IIP line, so it gives legacy GNB or Exide Absolyte strings a like for like, made in USA replacement path. A specialist confirms the capacity, footprint, and string configuration against the existing installation so the new cells drop into the system without redesign.
Which battery is best for a data center UPS string?
For a data center UPS string, the best battery depends on runtime, footprint, and how you maintain it, not on one brand. A 2V modular AGM such as the Absolyte AGP or C and D msEndur II suits large, long life lineups. Front terminal monoblocs suit tighter rack footprints and faster swaps. Size the string to the UPS load and runtime first, then pick the format and brand that fit the room.
How do I choose between industrial battery brands?
Choose by working through six axes: cell format, design life, certifications, domestic manufacturing, footprint and serviceability, and support model. Start with whether you are replacing a legacy Absolyte string and whether you need Class 1E or seismic qualification, then weigh footprint, sourcing, and service. A consultative supplier can map your application to the right brand quickly. The comparison table in this guide lays the axes out side by side.
Who can help me compare industrial battery options?
Tom Kierna at CPBS can help you compare industrial battery options across brands and applications. With more than 40 years in industrial batteries including 15 at GNB and Stryten, he sizes the battery to your duty cycle and gives a straight read on where the Absolyte AGP fits and where a competitor fits better. Reach him at 630-984-9718 or sales@criticalpowerbatterysolutions.com.
About the author: Tom Kierna is a Battery Systems Specialist at Critical Power Battery Solutions, the battery division of Advanced Technical Services Inc. (ATS), an ISO 9001 certified company serving mission-critical power since 1981. Tom has more than 40 years in industrial battery systems, including 15 years at GNB and Stryten, and specializes in chemistry selection, application sizing, and the GNB and Exide to Stryten transition. CPBS is an authorized Stryten Energy reseller. Last reviewed June 25, 2026.
References
- Stryten Energy, Absolyte AGP Product Brochure (SE1085) and Installation and Operations Manual. stryten.com
- EnerSys, PowerSafe SBS and DataSafe reserve power product documentation. enersys.com
- EnerSys, NorthStar Blue+ battery product page (NorthStar acquired by EnerSys, 2019). enersys.com
- C and D Technologies, msEndur II Pure Lead AGM Battery product documentation. cdtechno.com
- IEEE 535, Standard for Qualification of Class 1E Lead Storage Batteries for Nuclear Power Generating Stations. IEEE Standards Association. standards.ieee.org
- IEEE 693, Recommended Practice for Seismic Design of Substations. IEEE Standards Association. standards.ieee.org
