Battery part numbers explained (V, mAh, Wh)
The easiest way to order the correct replacement battery is to match the label on your old battery. This page explains what the common label fields mean and what must match.
- Part number / battery code: examples: A32‑K55, GK5KY, HS04, L14M4P71
- Voltage (V): examples: 11.1V, 14.8V, 15.2V
- Capacity: mAh (e.g., 4400mAh) and/or Wh (e.g., 56Wh)
- Cell type / chemistry: usually Li‑ion / Li‑poly (mostly informational)
1) Part number vs model number
Your laptop model (e.g., “Dell Inspiron 15 …”) is not always enough. Manufacturers often ship multiple battery revisions for the same laptop family. A battery part number is the most reliable match.
If the battery is internal, you can still use the laptop underside label to identify the exact model, then confirm the part number using the battery label once opened.
2) Voltage (V) must match
Voltage is the non‑negotiable field. A mismatch can cause charging problems or damage. If you see 11.1V on the old battery, you should buy 11.1V.
3) Capacity: mAh and Wh
Capacity tells you how long the battery may last. Labels often show mAh, Wh, or both.
Higher capacity can be fine if the part number matches and the battery fits. Some high‑capacity options use more cells and can be thicker.
4) Common mistakes (avoid these)
- Ordering by laptop family name only (example: “HP Pavilion 15”) without checking battery code.
- Ignoring voltage and choosing only the largest mAh.
- Mixing different connector styles for removable batteries (shape/locking tabs matter).