Batteries
The cell is one decision in a longer chain. Chemistry, nominal voltage, connector type, charger compatibility and peak current draw all have to line up before you power anything from it.
9V alkaline cells, CR2032 coin cells, 3.7V LiPo packs (1000–1200mAh), 7.4V 2S LiPo, 18650 Li-ion holders (1–6 cells), AA/AAA holders in every configuration, and snap leads with barrel adapters.
- 9V alkaline cells and CR2032 coin cells are primary (non-rechargeable); 3.7V LiPo and 18650 Li-ion cells need a dedicated charger matched to their chemistry and protection circuitry.
- 18650 holders come in 1- to 6-cell configurations with various output connectors; nominal pack voltages run 3.7V (1S), 7.4V (2S) and 11.1V (3S) depending on cell count.
- AA and AAA holders cover 3V to 12V in standard alkaline chemistry, with options for JST PH connectors, DC2.1 jacks and on/off switches — connector polarity varies between brands.
- For a safe swap, match nominal voltage, charged voltage, chemistry, connector polarity, charge path, peak current and physical fit — a 9V alkaline and a 2S LiPo both sit near 8.4V charged but are not interchangeable.
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General board checks (7)
- Match the load or regulator input range, including full-charge voltage, not just the nominal battery label.
- Confirm chemistry and charge path. Do not charge alkaline or CR2032 cells, and do not charge LiPo or Li-ion packs with the wrong charger.
- Check JST-PH polarity, barrel polarity, PP3 snap wiring, lead gauge and physical fit before treating connectors as compatible.
- Estimate peak current as well as runtime. Boost converters and radios can pull much more current from the cell than the output label suggests.
- Keep battery-management jobs separate: cell, charger, boost converter, protection circuit and power-path switching are not interchangeable.
- Do not mix old and new cells, different chemistries, or different capacities unless the pack and charger are designed for that exact arrangement.
- For large lithium packs, leave room for strain relief, enclosure clearance and a safe charging/storage plan.
