Techstream values for battery pack and temps

The hybrid battery degrades over time, and high temperature will excel the degradation. The center section of the battery pack is usually hotter than the end sections, so the center battery models will fail first. This has happened in your case.

The P0A80 code is set when the voltage difference between battery blocks becomes too high. The hybrid battery is composed of 28 modules all wired in series. Toyota does not monitor the voltage of each module. Toyota measures the voltages of a set of two modules, which is called a block. That is why you see 14 voltages listed in the Techstream data. So, the voltages shown are the 14 battery blocks (two modules). Six 1.2v cells are wired in series inside of the module case. You physically can not see the cells unless you destroy the module by taking off the plastic case of the module.

1) The nominal voltage of each cell is 1.2v. Six cells are inside each module. So, the nominal voltage of each module is 6 X 1.2v = 7.2v. The voltage of the cells and modules increases as the state of charge increases. The maximum voltage for a module is about 8.05v when installed in the car. So the battery block voltages will vary from 14.2v to 18.1v.

2) I do not know what the orange highlights indicate.

3) 90F to 100F are normal temperatures for the three battery temperature sensors. A hot battery would be in the 125F and higher temperature range.

The problem with your battery pack appears to be a bad cell in one of the two modules that make up block #7. A cell is 1.2v. A module with a bad cell would be ~1.2v lower than the other modules. If you take the battery pack apart and locate the bad module, then you can replace it with a good used module. This may work to make your car functional again. To do it correctly for the longest life, the battery pack should be reconditioned. The reconditioning process can take a long time to do based on the equipment that you have to do it. Using a grid charge and discharger, it would take about 5 or 6 days. Using a hobby charger and discharger to recondition each module, it will take weeks to months to do the process.

 

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