batteries. This article explains the differences you’ll see on labels such as
L21L6P70, L22L6P70, and L22M6P70,
and what those differences mean for compatibility.
What You’re Seeing on the Label
- Model Name (e.g., L21L6P70): Lenovo’s internal battery model/family.
- ASM P/N and FRU P/N: Assembly and Field-Replaceable Unit part numbers used for service and ordering.
- Pack ID (e.g., 3ICP5/55/90-2): Cell pack designation/chemistry layout.
- Capacity & Energy: Listed as “Typical” (average) and “Rated” (minimum guaranteed).
- Voltage: Rated voltage and charge-limit voltage.
Example From the Provided Image
- Model Name: L21L6P70
- ASM P/N: SB10W51995
- FRU P/N: 5B10W51894
- Pack ID: 3ICP5/55/90-2
- Typical Capacity / Energy: 8095 mAh / 94 Wh
- Rated Capacity / Energy: 7948 mAh / 92 Wh
- Rated Voltage: 11.55 V
- Charge-Limit Voltage: 13.2 V
These numbers place the battery squarely in Lenovo’s 94Wh 6-cell family. The
“Typical” vs. “Rated” difference explains why some labels show 94Wh while the
guaranteed minimum is 92Wh.
L21 vs. L22, and L vs. M — What Do They Mean?
- L21 / L22 typically indicates generation or production batch lineage.
- L / M in the middle position often reflects minor structural or supplier variations within the same family.
- Despite these code changes, electrical specs and fit are equivalent across the family when voltage/Wh match.
Side-by-Side Comparison
| Battery Label | Typical / Rated (mAh, Wh) | Rated Voltage | Charge-Limit Voltage | Pack ID | Example ASM / FRU |
|---|---|---|---|---|---|
| L21L6P70 | 8095mAh / 94Wh (Typical), 7948mAh / 92Wh (Rated) | 11.55V | 13.2V | 3ICP5/55/90-2 | ASM: SB10W51995 | FRU: 5B10W51894 |
| L22L6P70 | ≈94Wh (Typical), ≈92Wh (Rated) (family-equivalent) | ≈11.5V | 13.2V | 3ICP5/55/90-2 | ASM: SB11H56293 | FRU: 5B11H56392 |
| L22M6P70 | ≈94Wh (Typical), ≈92Wh (Rated) (family-equivalent) | ≈11.5V | 13.2V | 3ICP5/54/90-2 | ASM: SB11H56292 | FRU: 5B11H56391 |
Values shown as “≈” indicate family-typical specs inferred from label patterns in this
series. Small variations (e.g., 11.52V vs. 11.55V) are normal and within tolerance.
Compatible Part Numbers (Family Examples)
Common FRU/ASM references in this 94Wh family include:
- L21C6P70, L21D6P70, L21L6P70, L21M6P70, L22L6P70, L22M6P70
- SB10W51894, SB10W51994, SB10W51995, SB11H56292, SB11H56293, SB11M89891
- SBB1C81808, SBB1C81809, SBB1C81810, SBB1H89026, SBB1H89027
- SBB1L34622, SBB1L34623, SBB1L34624, SBB1L34625, SBB1L34626, SBB1L34720
- 5B10W51893, 5B10W51894, 5B11H56391, 5B11H56392, 5B11M90090, 5B11M90091
Compatible Pack IDs
- 3ICP5/55/90-2
- 3ICP5/54/90-2
What the Differences Mean for You
- Compatibility: If the voltage (≈11.5V) and energy (≈94Wh) match and the pack fits physically, variants are interchangeable for supported laptops.
- Runtime: The “Typical” (94Wh) vs. “Rated” (92Wh) distinction explains minor runtime differences between labels.
- Suppliers: Lenovo sources from multiple manufacturers (e.g., LGES, SMP), which drives part-number variation without changing specs.
Quick Checklist Before You Buy
- Match your original FRU/ASM number where possible.
- Confirm voltage and Wh rating are in the same family (≈11.5V, ≈94Wh).
- Ensure the form factor/connector matches your laptop model.