Took this off the online Workshop manual
DRIVE BATTERY
The drive battery consists of lithium ion battery that is small and lightweight and also has a high energy density. The motor (electric motor unit) and the air conditioner system are powered by the drive battery. The drive battery is housed in the metal case that has high water-resistant properties, vibration-resistant properties, dust-resistant properties and high heat-resistant properties. The case is placed under the floor. 8-cell modules in which 10 battery cells are in series. 10 of 8-cell modules are used. In total, the 80 battery cells are connected in series, which produces the total voltage as 300 V.
CHARACTERISTICS OF DRIVE BATTERY AND PRECAUTIONS IN USE
<Characteristics>
•The drive battery, which is based on lithium ion battery, can be charged before the stored energy is used up.
•The drive battery performance gradually decreases due to the duration of use or due to the use conditions.
•The drive battery performance can be varied with ambient temperature. Especially in the lower temperature, the cruising range may become shorter and the required time for charging may also become longer.
•When the vehicle is stored at the extremely high temperature or extremely low temperature, the battery performance can decrease.
•Even if the vehicle is not in use, the drive battery may be gradually discharged and the energy stored in the drive battery will be reduced.
<Precautions in use>
•If the vehicle is not used for a long time, check the drive battery meter reading every three months. If the reading is zero, charge the battery until the reading is shown. Or put the electric motor switch in the READY to automatically start the engine. Wait until the engine stops. Then, turn off the electric motor switch .
•The drive battery is retrieved. When the vehicle is discarded, always contact Mitsubishi Motors Dealer.
CELL MONITORING UNIT (CMU)
The cell monitoring unit (CMU) is mounted in each module. The battery cell voltage sensor measuring the each battery cell voltage and the five module temperature sensors measuring the module battery temperature are mounted to the module. The signal is input into the CMU. This allows the CMU to monitor each cell conditions. The CMU has the balancer that smooths voltage variations among the battery cells.
The ID number is assigned to each CMU, as shown on the following illustration. The CMU communicates with each other through the BMU and the CAN.
