The Li-Po battery "DTP301120" (manufactured by DATA POWER TECHNOLOGY) is used as the battery built into the robot. The number of cells is 1 cell, and the power capacity is 40 mAh. Over-charge, over-discharge, and over-current protection circuits are built in. The connector is ADH connector "ADHR-03V-H" (manufactured by JST).
<aside> <img src="/icons/warning_red.svg" alt="/icons/warning_red.svg" width="40px" /> To fit the battery into the narrow space inside the robot, the connector used on the DTP30112 is replaced with an ADH connector from a PH connector. To prevent the battery from ignition or other problems, replacement of the connecter should be done with extreme care at your own risk.
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Fig. 5-1 Appearance of DTP301120.
<aside> <img src="/icons/info-alternate_gray.svg" alt="/icons/info-alternate_gray.svg" width="40px" /> Since crimping tools are difficult to obtain & the contacts are of a size that cannot be done very well with general-purpose crimping tools, it is better to buy a pre-crimped cable (ASADHSADH26K102) and replace it. https://www.digikey.jp/short/q2w0bw07
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The Li-Po battery has a high power density and, if operated incorrectly, may cause a fire accident in the worst-case scenario. Please operate Li-Po batteries in consideration of the following operating voltage and operating time.
Generally, the discharge termination voltage of Li-Po batteries is 2.7~3.0 V, below which the battery deteriorates, and proper recharging becomes difficult. Since this system drives a motor, a minimum operating voltage of 3.2 V is set as a safety margin in the system. The user cannot manipulate or change this voltage value.
The internal battery voltage of the robot can be obtained via the cradle as a parameter of the Status Packet in 60 Hz cycles. During operation, monitor the battery voltage and charge the battery frequently.
For more details on the charging method, refer to 3.2. Charging
The nominal operating time of the robot is approximately 20 min. This measurement is based on the following test:
<aside> <img src="/icons/info-alternate_gray.svg" alt="/icons/info-alternate_gray.svg" width="40px" /> Measure the time it takes for the robot's motor to drop from a fully charged battery (approx. 4.2 V) to a minimum operating voltage of 3.2 V by continuously applying a constant load to the robot's motor.
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Since it is usually rare for a robot's motor to continue to be loaded, we assume that the operating time will be longer in actual operation. In any case, as mentioned in 5.2.1. Operating voltage, be aware of frequent recharging by monitoring the battery voltage.