Battery Test Engineer

Stellent IT LLC; Sunnyvale (CA); On-site; USD 110,000 - 170,000; Full time

Job summary

Stellent IT LLC in Sunnyvale, CA is seeking a hands-on Battery Test Engineer to support validation and characterization of battery cells, packs, chargers, and power electronics in a fast-paced hardware lab.

You will set up and execute charge/discharge cycling, monitor instrumentation, analyze data, and document results with clear reports, while following safety protocols and contributing to system-level validation efforts.

Qualifications

• Degree in Electrical Engineering or related field or equivalent hands-on experience.
• Knowledge of battery fundamentals: chemistry, capacity, internal resistance, SOC.
• Hands-on experience with lab instrumentation and electrical measurement.
• Ability to interpret schematics, power trees, and datasheets.
• Strong data-analysis skills using Python, MATLAB, or spreadsheets.

Responsibilities

• Set up and execute battery characterization tests: charge/discharge cycling, capacity, IR, load sweeps, and temperature behavior.
• Operate lab instrumentation (source meters, electronic loads, battery cyclers, DAQ, oscilloscopes, thermal chambers) and maintain calibration and safety standards.
• Perform bench bring-up, functional testing, and characterization of power supply circuits, regulators, and power rails.
• Build and maintain test fixtures, harnesses, and instrumentation for cells, packs, chargers, and rails.
• Capture, process, and analyze test data; summarize findings in clear reports.

Skills

Battery testing

Data analysis

Schematic interpretation

Lab instrumentation

Documentation & reporting

Education

Electrical Engineering degree or equivalent

Tools

Python

MATLAB

Spreadsheet tools

Job description

Title: Battery Test Engineer

Location: Sunnyvale, CA (Onsite

Exp: 5-12 years

Note: Look for candidates from the companies that make wearable/hearable (consumer electronics) products

We are seeking a hands-on Battery Test Engineer to support battery-related validation and characterization activities. Working closely with the battery systems lead, this role focuses on planning, executing, and reporting on laboratory testing of battery cells, packs, charging systems, and associated power electronics. The ideal candidate is meticulous, safety-conscious, and comfortable working in a fast-paced hardware development lab.

What You will Do:

• Set up and execute battery characterization tests: charge/discharge cycling, capacity, internal resistance, load sweeps, and temperature-dependent behavior.
• Operate lab instrumentation (source meters, electronic loads, battery cyclers, data acquisition systems, oscilloscopes, thermal chambers) and maintain calibration and safety standards.
• Perform bench bring-up, functional testing, and characterization of power supply circuits, regulators, and power rails.
• Build and maintain test fixtures, harnesses, and instrumentation for cells, packs, chargers, and power rails.
• Capture, process, and analyze test data; identify anomalies, trends, and failure signatures; summarize findings in clear reports.
• Support charging-system, fuel-gauge, and battery-management validation, including brownout, peak-power, and protection behavior.
• Assist in root-cause investigations and characterization of power/battery issues discovered during bring-up and validation.
• Document test plans, procedures, and results; keep organized records of raw data and derived metrics.
• Follow all battery-handling, storage, and lab-safety protocols.

What You Will Bring:

• Degree in Electrical Engineering, Mechanical Engineering, or a related field, or equivalent hands-on experience.
• Working knowledge of battery fundamentals: cell chemistry, capacity, internal resistance, state-of-charge, charge/discharge behavior.
• Hands-on experience with lab instrumentation and electrical measurement.
• Comfortable interpreting schematics, power trees, and datasheets.
• Strong data-analysis skills (e.g., Python, MATLAB, or spreadsheet-based tools).
• Detail-oriented, organized, and able to document work clearly.