--- title: The Connection Between Battery Lifespan and Custom Design description: Learn how custom battery pack design, BMS protection, cell configuration, and charge/discharge rates can improve battery lifespan and reliability. image: https://blog.epectec.com/hubfs/blog/custom-battery-packs-utilizing-a-bms.jpg --- [![Epec Engineered Technologies](https://www.epectec.com/images/logo.png "Epec Engineered Technologies")](https://www.epectec.com/) [![Epec Engineered Technologies](https://www.epectec.com/images/logo.png "Epec Engineered Technologies")](https://www.epectec.com/) - [Articles](https://www.epectec.com/articles/) - [Blog](https://blog.epectec.com/) - [Webinars](https://www.epectec.com/webinar/) - [Videos](https://www.epectec.com/videos/) - [Case Studies](https://www.epectec.com/case-studies/) - [News & Events](https://www.epectec.com/news/) - [Customer Portal](https://system.netsuite.com/c.406760/site/NSlogin.html) - [About](https://www.epectec.com/about/overview/) - Back - [Company Overview](https://www.epectec.com/about/overview/) - 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[Tweet](https://twitter.com/share) Battery lifespan is influenced by more than cell chemistry. In a [custom battery pack,](https://www.epectec.com/batteries/) the electronics, mechanical construction, cell configuration, charge rate, discharge rate, and operating environment can all affect how the pack performs over time. A custom design allows these elements to be selected around the application rather than requiring the application to accommodate a [standard battery pack](https://www.epectec.com/batteries/standard-vs-custom.html). The goal is to balance power requirements, available space, environmental conditions, mechanical stresses, and expected service life without compromising the battery pack’s ability to support the device. ## How Custom Battery Electronics Can Support Longer Life Battery pack electronics may include [battery cells](https://www.epectec.com/batteries/battery-pack-cell-availability.html), [wiring harness](https://www.epectec.com/cable-assemblies/wire-harnesses.html), relays, resistors, [battery management system](https://www.epectec.com/batteries/battery-management-systems.html) (BMS), charger, and, depending on the application and environment, a heating or cooling system. A design may use fully customized electronics, ready-made components, or a combination of both. Selecting these components for the application can help reduce conditions that may damage the battery or interrupt operation. ![Custom battery packs utilizing a battery management system](https://blog.epectec.com/hs-fs/hubfs/blog/custom-battery-packs-utilizing-a-bms.jpg?width=800&height=533&name=custom-battery-packs-utilizing-a-bms.jpg) *Custom battery packs utilizing a battery management system (BMS).* For example, an outdoor power tool and an indoor uninterruptible power supply (UPS) system have different load requirements, capacity needs, and mechanical stresses. A power-tool battery pack may be exposed to repeated vibration, shock, or impact if the tool is dropped. Its [cable assembly](https://www.epectec.com/cable-assemblies) and [battery enclosure](https://www.epectec.com/batteries/battery-enclosure-design.html) must account for those conditions. [![Check Out Our Battery Pack Enclosure Design Ebook](https://no-cache.hubspot.com/cta/default/707152/89cfffe1-d865-45e0-a6a2-c47c583bfa78.png)](https://cta-redirect.hubspot.com/cta/redirect/707152/89cfffe1-d865-45e0-a6a2-c47c583bfa78) If a wiring harness becomes loose or disconnects, the device can lose power. The custom design process should therefore consider how the harness, connections, and enclosure will respond to the mechanical risks associated with the application. ## How the BMS Protects a Lithium-Based Battery Pack In a [lithium-based battery pack](https://www.epectec.com/batteries/lithium-battery-technologies.html), the BMS is designed to monitor operating conditions and help protect the cells. Depending on the design, monitored values may include: - State of charge (SoC) - State of health (SoH) - Battery temperature - Cell or pack voltage - Current conditions The BMS can also provide overcurrent protection. If the battery pack charges too quickly or approaches its high-voltage limit, the BMS can limit or stop current to help prevent battery damage and capacity loss. The BMS may also [protect against over-discharging](https://www.epectec.com/articles/protection-circuit-modules-for-custom-battery-packs.html). If the application continues drawing power until the battery reaches a very low voltage, the BMS can disconnect the load. Preventing the pack from operating beyond its intended voltage limits can help protect the battery and support its usable lifespan. ## How Mechanical Design Affects Battery Durability The mechanical design brings the cells, electronics, connections, and protective components together into a complete battery pack. [Cell chemistry](https://www.epectec.com/batteries/chemistry/) remains an important factor in shelf life and overall performance, but the cell format and battery enclosure must also fit the application. **Common battery cell formats include:** - Prismatic - Cylindrical - Pouch - Button These formats package the active cell materials differently. They may also differ in venting provisions, positive and negative tab locations, and safety features intended to address conditions such as thermal runaway. Selecting the appropriate format allows the battery pack to fit within the space available in the device while meeting its mechanical and electrical requirements. ## Balancing Space Constraints and Structural Protection A thin application may require a [pouch cell](https://www.epectec.com/batteries/prismatic-pouch-packs.html) because the format can provide battery power within a limited amount of space. However, a pouch cell does not have the same rigid exterior structure as some other cell formats. This may increase the risk of damage if the pack does not provide sufficient mechanical support. **When a pouch cell is required, the battery pack design can account for:** - Dynamic stiffness - Static stiffness - Movement of internal components - Enclosure strength - Pack stability - Venting requirements The enclosure may need to provide additional strength and stability while still accommodating the cell and any necessary venting. These decisions should be based on the available space and the mechanical conditions the pack is expected to encounter. ## How Charge and Discharge Parameters Affect Lifespan Battery packs operate through repeated [charging and discharging cycles](https://blog.epectec.com/battery-charging-and-discharging-at-high-and-low-temperatures). The number of cycles a cell can complete before losing capacity and showing signs of aging depends on the battery chemistry and how the battery is used. As a general example, an average lithium-ion battery lifespan is approximately 300 to 500 cycles, or roughly two to three years depending on usage. Actual lifespan can vary with the battery design and operating conditions, so cycle life should be evaluated against the requirements of the specific application. Battery capacity and charge or discharge behavior may be expressed through amp-hours and [C rating](https://blog.epectec.com/optimizing-battery-pack-designs-a-guide-to-c-rating-and-sizing): - **Amp-hours** describe battery capacity in relation to the current delivered overtime. - **C rating** expresses a charge or discharge rate relative to the battery’s capacity. Both parameters should be selected around the application’s power requirements and desired battery lifespan. ## Series and Parallel Cell Configurations [Cell configuration](https://www.epectec.com/batteries/battery-configuration.html) affects the voltage and capacity of a battery pack. When cells are connected in series, pack voltage increases while capacity remains the same. This configuration can provide the higher voltage required by devices with greater power demands. When cells are connected in parallel, capacity increases while voltage remains the same. Increasing available capacity may allow the battery pack to provide a longer operating time before it must be recharged. The appropriate configuration depends on whether the application requires increased voltage, increased capacity, or a combination of both. ## Selecting an Appropriate C Rating The C rating indicates how quickly a battery is charged or discharged in relation to its capacity. For example, a 0.05 C rate, also written as C/20, represents a 20-hour charge or discharge rate. A lower C rate may support longer battery life because the battery is charged or discharged more slowly. However, a slow rate will not meet the needs of every application. High-power devices may require faster charging, faster discharging, or both. A higher C rate may satisfy the application’s immediate power requirements, but it can also place greater demands on the battery and may reduce its overall lifespan. C-rate selection therefore involves balancing required power delivery, charging time, discharge performance, and expected service life. ## Matching the Custom Design to the Application The application ultimately determines which battery pack features must be customized. Load requirements, available space, environmental conditions, mechanical stresses, operating time, and charge or discharge demands all influence the design. **Battery pack development may involve selecting or configuring:** - Battery cell chemistry and format - Battery management system - Wiring harnesses and electrical connections - Series or parallel cell arrangements - Battery enclosure construction - Charge and discharge parameters - Heating or cooling components when required by the application or environment These elements should be evaluated as part of one system. A cell format that fits the available space may require additional enclosure support. A high C rating may meet power requirements but affect expected lifespan. A mechanically robust enclosure may protect the battery pack but must still accommodate the cells, electronics, connections, and venting requirements. A successful custom battery pack design balances these considerations so that the pack can meet the application’s performance requirements while protecting the battery against foreseeable electrical and mechanical risks. ## Summary The application itself will dictate the types of customizations that will be required to meet specifications. Manufacturers can provide the custom design required to power your device, while also providing suggestions regarding how certain changes can be made to improve the overall lifespan. Then the customer can select the appropriate changes that will not impact the battery pack's productivity. --- ## Key Takeaways - **Customization extends lifespan:** Tailoring electronics such as BMS, wiring harnesses, and enclosures to the application helps improve performance, reduce risks, and lengthen overall battery life. - **BMS safeguards the pack:** A properly designed Battery Management System monitors state of charge, state of health, temperature, and voltage while providing protection against overcharging, over-discharging, and overcurrent. - **Mechanical design matters:** Choosing the right cell format (pouch, prismatic, cylindrical, etc.) and reinforcing enclosures for strength, stability, and venting are critical for durability and safety. - **Charge/discharge rates impact cycles:** Lifespan depends on how charging and discharging are managed. Lower C rates support longer cycle life, while higher C rates increase stress but may be required for high-power devices. - **Application dictates customization:** Different environments and power demands (e.g., outdoor tools vs. UPS systems) require specific design choices to balance reliability, safety, and usable lifespan. - [Tweet](https://twitter.com/share) Topics: [Battery Packs](https://blog.epectec.com/topic/battery-packs), [Product Design](https://blog.epectec.com/topic/product-design) --- [Next](https://blog.epectec.com/electrical-and-mechanical-requirements-in-flexible-circuit-designs) | [All posts](https://blog.epectec.com/all) | [Previous](https://blog.epectec.com/battery-pack-maintenance-and-storage-best-practices) [![New Call-to-action](https://no-cache.hubspot.com/cta/default/707152/1ea77bbf-1c3f-462e-9e09-74f2e9727bf3.png)](https://cta-redirect.hubspot.com/cta/redirect/707152/1ea77bbf-1c3f-462e-9e09-74f2e9727bf3) ## Leave a Comment --- ## Related Posts --- ### Recent Posts --- ### Posts by Topic - [Printed Circuit Boards (162)](https://blog.epectec.com/topic/printed-circuit-boards) - [Product Design (138)](https://blog.epectec.com/topic/product-design) - [Battery Packs (122)](https://blog.epectec.com/topic/battery-packs) - [Cable Assemblies (102)](https://blog.epectec.com/topic/cable-assemblies) - [Flex & Rigid-Flex PCB's (95)](https://blog.epectec.com/topic/flex-rigid-flex-pcbs) - [Electronics Industry (61)](https://blog.epectec.com/topic/electronics-industry) - [User Interfaces (55)](https://blog.epectec.com/topic/user-interfaces) - [Quality Solutions (33)](https://blog.epectec.com/topic/quality-solutions) - [Flexible Heaters (30)](https://blog.epectec.com/topic/flexible-heaters) - [Events, Training, and Support (9)](https://blog.epectec.com/topic/events-training-and-support) - [RF Products (7)](https://blog.epectec.com/topic/rf-products) - [CNC Machining (3)](https://blog.epectec.com/topic/cnc-machining) - [Fans & Motors (1)](https://blog.epectec.com/topic/fans-motors) See All --- --- ### Need Help with A Project? 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