4,221 mAh Is How Many Wh?
Quick Answer: 4,221 mAh = 15.6177 Wh (at 3.7V)
Similar mAh to Wh Conversions
Values close to 4,221 mAh (at 3.7V Li-ion):
Popular mAh to Wh Conversions
See Also
- 221 mAh to Wh — 0.8177 Wh
- 721 mAh to Wh — 2.6677 Wh
- 1,221 mAh to Wh — 4.5177 Wh
- 1,721 mAh to Wh — 6.3677 Wh
- 2,221 mAh to Wh — 8.2177 Wh
- 2,721 mAh to Wh — 10.0677 Wh
- 3,221 mAh to Wh — 11.9177 Wh
- 3,721 mAh to Wh — 13.7677 Wh
- 4,721 mAh to Wh — 17.4677 Wh
- 5,221 mAh to Wh — 19.3177 Wh
- 5,721 mAh to Wh — 21.1677 Wh
- 6,221 mAh to Wh — 23.0177 Wh
- 6,721 mAh to Wh — 24.8677 Wh
- 7,221 mAh to Wh — 26.7177 Wh
- 7,721 mAh to Wh — 28.5677 Wh
- 8,221 mAh to Wh — 30.4177 Wh
- 8,721 mAh to Wh — 32.2677 Wh
- 9,221 mAh to Wh — 34.1177 Wh
Frequently Asked Questions
How many Wh is 4,221 mAh?
4,221 mAh equals 15.6177 Wh at 3.7V (Li-ion nominal voltage). The exact Wh depends on the battery voltage: Wh = mAh × V / 1,000.
How do I convert 4,221 mAh to Wh?
Multiply 4,221 by the battery voltage, then divide by 1,000. At 3.7V: 4,221 × 3.7 / 1,000 = 15.6177 Wh.
Is 4,221 mAh allowed on a plane?
At 3.7V, 4,221 mAh = 15.6177 Wh. Airlines allow lithium batteries up to 100 Wh in carry-on luggage. Batteries between 100–160 Wh require airline approval. Batteries over 160 Wh are prohibited on passenger aircraft.
Formula: Wh = mAh × V / 1,000. Results assume nominal battery voltage.
Conversion factors verified against NIST, BIPM
Based on SI definitions (BIPM).
Last reviewed: March 2026
