Methods, tests and practical checks
Battery & Electronics Guides
Use repeatable test methods, source-backed buying checks and engineering calculations to diagnose batteries and predict device runtime.
How to Tell If a CR2032 Battery Is Still Good
Test a CR2032 at rest and under load, separate battery faults from contact problems, and interpret voltage against the device cutoff and datasheet conditions.
Read guide →How to Choose a CR2032 Brand and Check Freshness
Compare CR2032 datasheet conditions, decode DL2032 and ECR2032 labels, inspect a delivered pack, and document a fair same-condition battery test.
Read guide →How to Buy LR44 or AG13 Without Choosing the Wrong Cell
Decode LR44, AG13, A76, and 76A packaging, distinguish alkaline from silver oxide, check freshness, and document a repeatable arrival inspection.
Read guide →Battery Runtime: Measure Current and Use mAh Correctly
Measure device current, convert active and sleep periods into average load, estimate runtime, and correct for cutoff voltage, pulse load, and conversion losses.
Read guide →Coin-Cell Power for MCUs: Measure Pulses Before Selection
Select CR2032 or CR2450 for a low-power MCU by measuring sleep and radio pulses, checking brownout voltage, sizing capacitance, and validating cold operation.
Read guide →IoT Sensor Battery Life: A Duty-Cycle Test Method
Build an IoT battery-life estimate from measured sleep, sampling, radio, retry, and regulator current, then validate it against voltage sag and cutoff.
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