How Long Do Custom Batteries Stay in Production?

Introduction

When an OEM selects a battery for a new product, the immediate questions are usually about voltage, capacity, dimensions, discharge performance, connector configuration, and price. But once the battery becomes part of a commercial product, another question becomes equally important:

This concern is especially important for medical devices, industrial equipment, portable electronics, smart devices, GPS products, wearables, and other applications that may remain in production for several years. Replacing a battery after the product has already been designed and validated can involve much more than purchasing a different cell. It may require mechanical changes, electrical validation, firmware adjustments, reliability testing, regulatory review, certification work, inventory changes, or even redesign of the finished product.

At A&S Power, we regularly communicate with customers to understand the practical concerns they face when selecting and managing battery solutions. These conversations help us see the questions that matter beyond basic battery specifications. Long-term availability, production continuity, component changes, and supply stability are recurring concerns among OEM customers.

One customer recently raised a question that illustrates this concern very clearly: if they choose a customized battery for their project, how can they avoid moving to another battery only a short time later?

Why OEM Customers Worry About Battery Obsolescence？

Battery technology continues to evolve, and manufacturers may change their product portfolios over time. Standard catalog batteries can be particularly vulnerable to product-line changes because manufacturers manage them according to broader market demand.

For an OEM, however, the consequences can be much larger.

Suppose a device has been designed around a specific battery. If that battery suddenly becomes unavailable, the manufacturer may need to:

• Find another battery with compatible dimensions
• Re-evaluate voltage and capacity
• Check charging compatibility
• Re-test the protection circuit
• Modify mechanical components
• Change the connector or cable
• Revalidate thermal performance
• Update technical documentation
• Repeat relevant safety or compliance testing
• Manage inventory of the previous battery
• Potentially redesign part of the finished product

The problem is therefore not simply the price of the replacement battery.

Battery supply-chain management is a recognized part of broader product lifecycle management because battery systems depend on multiple upstream components and suppliers.

How Is a Custom Battery Lifecycle Different?

A custom OEM battery is developed around a specific customer's application rather than being designed primarily for general catalog sales.

The customization may involve:

• Battery dimensions
• Voltage
• Capacity
• Cell configuration
• Connector
• Cable length
• PCM or BMS
• Protection parameters
• Communication functions
• Packaging
• Operating temperature
• Charging requirements
• Certification requirements

For this reason, the battery becomes closely integrated with the customer's product.

A&S Power provides customized lithium-ion and lithium polymer battery solutions covering electrical design, mechanical integration, connectors, cables, and protection systems.

Learn more about our custom battery solutions .

This creates an important difference in how the production relationship is managed.

A standard battery may be discontinued because the supplier changes its catalog.

A project-specific battery, by contrast, is produced because a customer has an ongoing application that requires it.

That means customer demand becomes an important driver of the battery's production lifecycle.

What Determines How Long a Custom Battery Remains Available?

There is no universal number of years that applies to every custom battery project.

Instead, long-term supply depends on several factors.

1. Customer Demand

This is one of the most important factors.

If a customer continues to manufacture and sell a product that requires a particular custom battery, there is a continuing commercial reason to maintain production and supply.

This is why we tell customers:

The objective is not simply to sell the first production batch. The objective is to support the customer's product lifecycle.

2. Cell and Material Availability

A battery pack may contain multiple critical components, including cells, protection components, connectors, wires, PCBs, and other materials.

A change involving one upstream component can potentially affect the finished battery.

For this reason, a reliable OEM battery supplier needs to pay attention not only to final assembly but also to the broader supply chain.

3. Production Capability

Long-term supply also depends on whether the manufacturer has the engineering and manufacturing capabilities required to reproduce the approved design consistently.

For OEM customers, production continuity should therefore be evaluated together with:

• Manufacturing capability
• Quality management
• Engineering support
• Production documentation
• Material management
• Testing capability
• Change control

4. Product and Certification Requirements

If a battery is used in a regulated application, changing the battery may require additional evaluation.

A&S Power's certification portfolio includes UL2054, UL1642, CE, CB, UN38.3, CCC, KC, PSE, WERCS, BIS and other certification records for applicable products.

Visit our battery certification page to learn more about applicable certifications.

This is another reason why OEM customers should consider supply continuity before selecting a battery.

A battery change is potentially more complicated when the original battery is already part of a validated product configuration.

A Real Customer Question: Will You Continue Producing Our Battery?

This question comes directly from a real customer communication.

The customer's concern was straightforward:

This is a very reasonable question for an OEM customer.

The customer was not simply asking whether the battery was available today. They were asking whether choosing this battery would create another engineering problem in the near future.

Our response was:

This reflects an important principle of custom battery manufacturing.

When a battery is developed specifically for an OEM project, the relationship is not based solely on a catalog number. The battery is connected to the customer's product, specifications, forecast, and ongoing requirements.

Therefore, continued customer demand is a key factor in maintaining production.

Custom Battery vs. Standard Battery: Supply Lifecycle

Neither approach is automatically better for every application.

A standard battery may be ideal when a product uses a common size and has a short development cycle.

A custom battery becomes more attractive when the battery is an important part of the product architecture and the OEM expects a longer product lifecycle.

A&S Power's previous comparison of custom and off-the-shelf batteries similarly emphasizes that the decision should consider development risk and total cost, not only the initial battery price.

How OEMs Can Reduce Long-Term Battery Replacement Risk

Choosing a battery supplier is an important part of product lifecycle planning.

Before starting mass production, I recommend OEM customers ask the following questions.

1. Is the battery standard or project-specific?

Understand whether you are buying a catalog product or a battery developed specifically for your application.

2. What is the expected product lifecycle?

Tell the supplier whether the finished product is expected to remain in production for two years, five years, ten years, or longer.

This gives the battery manufacturer a better basis for supply planning.

3. Can the manufacturer support repeat production?

Ask whether the supplier has experience supporting repeat OEM orders rather than only producing prototypes or one-time batches.

4. How are material changes handled?

A good supplier should have a process for managing important changes involving cells, materials, components, specifications, and production processes.

5. Can technical records be maintained?

Keep approved drawings, specifications, test results, battery samples, certification documents, and production records organized.

This makes future production and engineering review much easier.

6. Is there a communication process for potential supply changes?

For long-life products, communication is just as important as manufacturing capability.

The earlier an OEM knows about a potential supply issue, the more time it has to evaluate alternatives.

Why Long-Term OEM Battery Relationships Matter

For a custom battery manufacturer, the relationship does not end when the first production order is shipped.

The real challenge is maintaining consistent production over time.

A custom battery program may move through several stages:

The later stages can continue for years depending on the customer's product lifecycle.

A&S Power's custom battery manufacturing process covers requirements, design, sampling, testing, confirmation, production, and delivery.

This project-oriented approach is particularly valuable for products where the battery is difficult to replace.

Examples include:

• Medical devices
• GPS trackers
• Wearable electronics
• Industrial equipment
• Security systems
• IoT products
• Consumer electronics
• Portable instruments

What Should an OEM Include in a Long-Term Battery Supply Plan?

A good supply plan should contain more than an annual purchase quantity.

This information creates a stronger foundation for maintaining battery supply throughout the product lifecycle.

Conclusion

When an OEM customer chooses a battery, the question should not only be "Does this battery work today?"

A better question is:

For standard catalog batteries, availability can depend heavily on the supplier's product strategy and market demand.

For a custom battery developed specifically for an OEM project, the situation is different. The battery is connected to the customer's application, specifications, and ongoing demand.

At A&S Power, our approach is straightforward: when we develop a customized battery for a customer's project, we view continued production and supply as part of supporting that project. As long as the customer continues to require the battery, we are committed to continuing to support its production and supply.

For OEMs developing medical devices, industrial equipment, IoT products, wearables, and other long-life products, discussing battery lifecycle and supply continuity at the beginning of the project can help reduce future redesign risk and improve long-term planning.