If your IMA light is on you may be able to fix it by following these instructions. There is a chance of lethal electric shock so perform this procedure at your own risk. You can test each individual cell module and replace or recondition them.

A better explanation of the Tenergy T180 settings, but for a Prius so the numbers will be different:    • Reconditioning a Prius Hybrid Battery...  

Information about the hybrid battery specifications like capacity and voltages: https://avt.inl.gov/sites/default/fil...
From the above PDF:
Battery Specifications
Manufacturer: Sanyo
Battery Type: Nickel Metal Hydride
Rated Capacity: 6.0 Ahr
Rated Power: Not Available
Nominal Pack Voltage: 144.0 VDC
Nominal Cell Voltage: 1.2 V
Number of Cells: 120

00:00 Intro and Tool List
01:06 Battery Removal
06:53 Battery Disassembly
11:40 Testing and Reconditioning
22:10 Balancing Voltage
25:10 Reassembly
31:43 Reinstallation
36:13 Final Notes