The first-generation Prius came with two different packs: the NHW10 used 40 modules at 288 V, and the NHW11 moved to 38 modules at 273.6 V. Ordering the wrong one is the most common Gen1 fitment error.
Chassis codes covered
NHW10 (1997–2000) · NHW11 (2000–2003)
Pack specification
| NHW10 | 40 modules · 288 V |
| NHW11 | 38 modules · 273.6 V |
| Capacity | 6.5 Ah |
| Format | Cylindrical 7.2 V modules |
What you need to know
The split happened at the 2000 model change. If your car is a 1997–2000 NHW10, it takes the 40-module pack; a 2000–2003 NHW11 takes the 38-module pack.
The difference is 14.4 V and two modules — enough that the ECU will reject the wrong pack outright.
Packs we build for this vehicle
| Pack | Chemistry | Configuration | Price |
|---|---|---|---|
| Toyota Prius NHW11 Hybrid Battery 2000-2003 | Ni-MH | Ni-MH | 273.6V · 38 pcs | $2,392 |
| Toyota Prius NHW10 Hybrid Battery 1997-2000 | Ni-MH | Ni-MH | 288V · 40 pcs | $2,510 |
Before you order
Send the VIN or the chassis code and we confirm the pack against workshop data before it ships. If we confirm the fitment from your VIN and the pack does not fit, we take it back and cover the return freight. Prices by pack size · Fault-code diagnostics.
Frequently asked questions
How do I tell NHW10 from NHW11?
By the chassis code on the VIN plate. The model year alone is ambiguous around the 2000 changeover.
Are the two packs interchangeable?
No. 288 V and 273.6 V are different enough that the ECU will not accept the wrong one.
Is the Gen1 pack still available?
Yes, both the 40-module and 38-module versions are built to order.