18650 Li-ion cell
Li-ion NMC · 3.7 V nominal · 2500 mAh · 90% charged
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Typical part: 18650 Li-ion (NMC)
Ratings and limits
| Voltage | 2.5–4.2 V, 3.6–3.7 V nominal |
|---|---|
| Capacity | 2500 mAh typical |
| Charge | CC/CV to 4.2 V at ≤ 0.5–1 C |
How to use it
Packs for portable gear, always with a BMS or protection board.
Lessons and builds that use it
- USB-C charging: the power path
- SEPIC: output above and below the input
- Li-ion CC/CV charger from an LM317
- Ideal-diode OR-ing: USB plus battery
- Single 18650 charger with LED charge indicator (build)
- 18650 battery level indicator (build)
- USB power bank (build)
- Automatic emergency light (build)
- Solar garden light with dusk switch (build)
- ESP32 battery sensor node (build)
- 10,000 mAh power bank · 4 × 18650 (build)
- 20,000 mAh power bank · 8 × 18650 (build)
- 40,000 mAh power bank · 16 × 18650 (build)
- Single 18650 charger with a 3-LED charge indicator (green 80–100 %, yellow 40–79 %, red below 40 %) (build)