HV battery on-board equalization procedure.

Found this interesting bit of info at Alldata. Unfortunately it requires the diagnostic tool to do it.

At least you could ask the dealership to do this once in a while especially if they tell you that the battery is showing different voltages in each block. I know lead acid batteries last much longer if they are equalized regularly.

I wouldn't put it past the dealer to leave this out of routine service in the hopes that the will be able to sell you a new battery soon. That is if they even know about it.

TSB: MAINTENANCE FOR HV & AUXILIARY BATTERIES AT PORT & DEALERS

D. On-board Equalizing Charge of HV Battery.
NOTE: Conditions for "On-board Equalizing Charge" are:
^ "READY" light ON.
^ "Running mode selector lever in "R"
^ HV battery temperature between 10°C and 45°C. (50°F and 113°F)
^ The 4 temperature sensors in the HV battery must be within 20°of each other.
^ HV battery SOC (State Of Charge) below 70%.
1. Park the vehicle in a well-ventilated area or connect an exhaust extraction hose to the exhaust pipe.
2. Apply the parking brake.
3. Turn off all lights and accessories.
4. Put the running mode selector lever in "P."
5. Turn and hold the ignition switch to "START" with the brake pedal depressed. The vehicle has started when the "READY" indicator remains on steady and a beep sounds. Then, release the ignition key.
6. Using the Diagnostic Tester with program card version 1O.1a or later, perform "On board Equalizing Charge" of the HV battery as outlined in Screen Flow 1.
^ During "On-board Equalizing Charge," the gasoline engine will continuously run allowing the generator to slow charge the HV battery pack fully. The procedure will last approximately 30 minutes.
^ When the "On-board Equalizing Charge" is completed, the gasoline engine stops, the energy flow to the HV battery stops in the multi-information display, and the battery icon shows a full charge.
NOTE:
^ Normally the A/C should be turned off. Otherwise, the engine may continue to run after "On-board Equalizing Charge" is complete.
^ In high ambient temperatures (90°F or higher) the A/C should be run with all windows closed to allow the cool air to circulate in the battery pack during "On-board Equalizing Charge" and prevent interruption of the process due to elevated battery pack temperature.
Recommended settings:
- A/C button "ON."
- Blower dial set to "AUTO."
- Temperature dial set to 70°F.
7. After completion of "On-board Equalizing Charge," leave the vehicle with the ignition switch in "ON" ("READY" light off) and the running mode selector lever in "P" for 10 minutes to cool down the HV battery.
NOTE: HV battery is cooled down by the HV battery cooling fan.