Toyota 2008 Prius Quick Reference Manual page 403

4-3. Do-it-yourself maintenance
n Before recharging
When recharging, the 12 volt battery produces hydrogen gas which is flam-
mable and explosive. Therefore, before recharging:
If recharging with the 12 volt battery installed on the vehicle, be sure to
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disconnect the ground cable.
Make sure the power switch on the charger is off when connecting and
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disconnecting the charger cables to the 12 volt battery.
n After recharging/reconnecting the 12 volt battery
In some cases, the hybrid system may not start. Follow one or both of the
following procedures:
After opening and closing the driver's door, wait 10 seconds then attempt
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to start the engine. (If the system does not start first time, repeat the pro-
cedure.)
With the shift lever in "P" and the "POWER" switch in the OFF mode,
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open and close any door, then attempt to start the hybrid system.
If the system will not start even after multiple attempts at both methods, con-
tact your Toyota dealer.
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