Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.

Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.

Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.

Abstract: Techniques to detect faults in a battery with at least two parallel battery cells. In some examples, a cell may fail or become disconnected. The circuitry of this disclosure may determine whether a battery pack has a fault by measuring battery parameters at the positive and negative terminals. When the circuitry detects a fault, the circuitry may adjust the charge rate so that the charge does not exceed the maximum charge rate of any single cell of the battery pack. In some examples, the circuitry may shut off the charge current to the battery pack to ensure that the charge rate does not exceed the maximum charge rate of any single cell. To avoid false positive fault detection, the circuitry of this disclosure may verify the detected fault and the parameters of the charging cycle before reducing the charging current.

Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.

Abstract: Content stored on a server may be selected using a user device and enabled on a central device. The identity of the central device may be authenticated without transmitting user credentials corresponding to the user, user device, user account, etc. A central device identifier can be sent to the server via the user device. An encrypted version of the central device identifier may be returned to the user device and to the central device. The central device can send the encrypted and unencrypted version of the identifier to the server, and the server can transmit the desired content to the remote device based on a comparison of the encrypted and unencrypted identifier.

Abstract: Content stored on a server may be selected using a user device and enabled on a central device. The identity of the central device may be authenticated without transmitting user credentials corresponding to the user, user device, user account, etc. A central device identifier can be sent to the server via the user device. An encrypted version of the central device identifier may be returned to the user device and to the central device. The central device can send the encrypted and unencrypted version of the identifier to the server, and the server can transmit the desired content to the remote device based on a comparison of the encrypted and unencrypted identifier.

Abstract: Content stored on a server may be selected using a user device and enabled on a central device. The identity of the central device may be authenticated without transmitting user credentials corresponding to the user, user device, user account, etc. A central device identifier can be sent to the server via the user device. An encrypted version of the central device identifier may be returned to the user device and to the central device. The central device can send the encrypted and unencrypted version of the identifier to the server, and the server can transmit the desired content to the remote device based on a comparison of the encrypted and unencrypted identifier.

Abstract: Content stored on a server may be selected using a user device and enabled on a central device. The identity of the central device may be authenticated without transmitting user credentials corresponding to the user, user device, user account, etc. A central device identifier can be sent to the server via the user device. An encrypted version of the central device identifier may be returned to the user device and to the central device. The central device can send the encrypted and unencrypted version of the identifier to the server, and the server can transmit the desired content to the remote device based on a comparison of the encrypted and unencrypted identifier.