Capacity or Energy
Estimate required battery capacity, nominal energy, or convert between mAh, Ah, Wh, and kWh.
Start with capacity and energy →ZERNE Battery Calculation Tool
Battery Calculation Tool
Choose the right calculator to estimate lithium battery capacity, energy, runtime, charging time, C-rate, discharge current, or 18650 battery pack requirements. Use these tools for early LiPo, lithium polymer, 18650, and custom battery planning.
Capacity and energy planningCharging and discharge estimatesLiPo, 18650, and pack support
AhBattery planning
V × Ah = Wh
Start with your question
What Do You Need to Calculate?
Start with the value or planning question you already know. Select a calculator group to find the most suitable tool for your battery project.
Runtime or Load
Estimate how long a battery may support a device load, or review current, capacity, and operating time.
Explore runtime and discharge →Charging Time
Estimate charging time for a LiPo battery, lithium polymer battery, or 18650 cell and pack.
Explore charging tools →Battery Pack Planning
Review 18650 pack voltage, capacity, energy, current, runtime, and basic BMS references.
Explore pack planning →Calculator center
Battery Calculators for Early Lithium Battery Planning
Each calculator is designed for a specific battery planning question. Use the tools to develop an early reference for LiPo, lithium polymer, 18650, and complete lithium battery projects before reviewing final product requirements.
Capacity and Energy Planning
Use this calculator when you need to estimate battery capacity or nominal energy from voltage, current, power, or operating time.
Lithium Battery Capacity and Energy Calculator
Calculate battery capacity or nominal energy from voltage, current, power, and operating time. Convert between mAh, Ah, Wh, and kWh for LiPo, 18650, and lithium battery pack planning.
Open the capacity and energy calculator →Runtime and Discharge Planning
Use these tools to connect battery capacity with device load, operating time, discharge current, and C-rate.
Lithium Battery Runtime Calculator
Estimate how long a LiPo, lithium polymer, 18650, or lithium battery pack may support a device load based on capacity, voltage, current, power, and practical efficiency.
Open the runtime calculator →Battery C-Rate and Discharge Current Calculator
Calculate battery C-rate, discharge current, or required capacity from two known values. Use it for early discharge planning across LiPo, 18650, and complete lithium battery packs.
Open the C-rate calculator →Battery Charging Time Planning
Choose the calculator that matches the battery type and charging information available for your project.
LiPo Battery Charging Time Calculator
Estimate LiPo charging time from battery capacity, charging current or C-rate, starting SOC, target SOC, and practical charging conditions.
Open the LiPo charging calculator →18650 Battery Charging Time Calculator
Estimate charging time for an 18650 cell or battery pack using capacity, charging current, starting SOC, target SOC, and a practical charging factor.
Open the 18650 charging calculator →18650 Battery Pack Planning
Use this calculator when you need to review the early electrical parameters of an 18650 battery pack.
18650 Battery Pack Calculator
Review 18650 pack voltage, capacity, energy, theoretical current, runtime, series-parallel configuration, and basic BMS current reference.
Open the 18650 pack calculator →Planning workflow
How to Use the Battery Calculation Tools
The tools support early battery planning. Start with the values available from the device or project, then use the result as a reference for the next design question.
Identify the Values You Know
Start with the battery voltage, capacity, device power, current, operating time, charging current, or pack configuration available from your project.
Choose the Appropriate Calculator
Select the tool that matches your immediate question instead of entering unrelated values into a general calculator.
Review the Planning Estimate
Compare the result with your expected load, operating profile, charging method, and battery type.
Confirm the Battery Specification
Review the result with the cell or pack datasheet, BMS, available space, connector, thermal conditions, and sample testing requirements.
Application planning
Where Battery Calculation Supports Product Planning
Capacity, energy, runtime, charging, and discharge calculations can help define an early battery direction for different battery-powered products.
GPS Tracker Battery Planning
Use capacity and runtime estimates when planning compact batteries for tracking devices and connected equipment.
Explore GPS tracker batteries →Handheld Device Battery Planning
Review capacity, energy, runtime, and charging requirements for portable devices such as scanners, POS machines, and handheld equipment.
Explore handheld device batteries →Wearable Device Battery Planning
Use early capacity and energy estimates when matching a compact polymer lithium-ion battery to wearable product size and operating conditions.
Explore wearable device batteries →Battery direction
Choose a Battery Direction for Your Project
After reviewing the initial calculation, compare the battery direction with your product structure, load profile, available space, and charging method.
Lithium Polymer Batteries
Explore compact polymer lithium-ion battery options for portable, wearable, GPS, and other space-sensitive products.
Explore lithium polymer batteries →18650 Lithium Batteries
Review 18650 cell options for applications that require cylindrical lithium-ion cells and battery pack development.
Explore 18650 lithium batteries →Lithium Battery Packs
Explore complete battery pack directions when voltage, capacity, protection, connectors, and mechanical integration must be coordinated.
Explore lithium battery packs →Important planning note
Use Calculator Results as an Early Planning Reference
Planning estimate only.These calculators provide theoretical or preliminary planning estimates. Actual battery performance may change with cell chemistry, internal resistance, temperature, discharge rate, voltage cutoff, BMS settings, wiring, connectors, mechanical structure, and real device load. For production battery development, confirm the result against the selected cell or battery-pack datasheet and the complete application requirements.
Frequently asked questions
Battery Calculation Tool FAQ
What can I calculate with ZERNE's battery tools?
ZERNE's battery calculation tools cover capacity, energy, runtime, charging time, C-rate, discharge current, and 18650 battery pack planning. Each calculator focuses on a specific planning question so that the input values and result can be interpreted more clearly.
Which calculator should I use to estimate battery capacity?
Use the Lithium Battery Capacity and Energy Calculator when you need to estimate capacity or energy from voltage, current, power, and operating time. It also supports conversions between mAh, Ah, Wh, and kWh.
Can these calculators be used for LiPo and 18650 batteries?
Yes. The tool group includes calculators for LiPo, lithium polymer, 18650, and complete lithium battery pack planning. Always enter values from the same cell or battery-pack level and follow the applicable product documentation.
Are the calculator results suitable for final battery production?
No. The results are intended for early planning and comparison. Final battery development must also consider the cell datasheet, load profile, BMS, charging system, temperature, wiring, connector, mechanical space, protection requirements, and sample testing.
How do I use the results for a custom battery request?
Use the calculated result together with your target voltage, capacity, runtime, average and peak current, available space, connector, charging method, BMS requirements, application, and expected quantity. These details help ZERNE review a more practical custom battery direction.
Why can actual battery performance differ from the calculated result?
Actual performance may change because of temperature, battery age, internal resistance, voltage sag, changing device load, BMS cutoff settings, wiring losses, and the difference between a theoretical estimate and a tested battery design.
From calculation to battery design
Need Help Turning a Calculation Into a Battery Specification?
Share your voltage, capacity, runtime, load current, available space, connector, charging method, and protection requirements. ZERNE can help review the early direction for a LiPo, 18650, or custom lithium battery pack.