Toyota 2012 Prius Owner's Manual page 642

6-1. Specifications
Electrical system
12-volt battery
Open voltage
at 68 °F (20 °C):
Charging rates
Transmission
*
Fluid capacity
Fluid type
*
: The fluid capacity is the quantity of reference.
If replacement is necessary, contact your Toyota dealer.
NOTICE
■
Transmission fluid type
Using transmission fluid other than "Toyota Genuine ATF WS" may cause
deterioration in shift quality, locking up of your transmission accompanied by
vibration, and ultimately damage the transmission of your vehicle.
618
PRIUS PHV_OM_OM47818U_(U)
12.6 ⎯ 12.8 V Fully charged
12.2 ⎯ 12.4 V Half charged
11.5 ⎯ 11.9 V Discharged
(Voltage is checked 20 minutes after the hybrid
system and all lights are turned off.)
5 A max.
3.6 qt. (3.4 L, 3.0 Imp.qt.)
Toyota Genuine ATF WS