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BQ27621-G1

ACTIVE

System-side fuel gauge with Dynamic Voltage Correlation, battery gas gauge

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Data sheet
User guides

BQ27621-G1

ACTIVE
Data sheet Order now

Product details

Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 32000 Implementation System External capacity indication None Features No Sense Resistor Required Operating temperature range (°C) -40 to 85 Rating Catalog
Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 32000 Implementation System External capacity indication None Features No Sense Resistor Required Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YZF) 9 3.0625 mm² 1.75 x 1.75
  • Single-Cell Li-Ion Battery Fuel Gauge
    • Resides on System Board
    • Supports Embedded or Removable Batteries
    • Powered Directly from Battery with Integrated
      LDO
  • Easy To Configure Fuel Gauging Based on the
    Dynamic Voltage Correlation Algorithm
    • Reports Remaining Capacity and State of
      Charge (SOC) with Smoothing Filter
    • Automatically Adjusts for Self-Discharge,
      Temperature, and Rate Changes
  • Microcontroller Peripheral Supports:
    • 400-kHz I2C Serial Interface
    • Configurable SOC Interrupt or
      Battery Low Digital Output Warning
    • Internal Temperature Sensor or
      Host Reported Temperature
  • Support 4.2-V, 4.3-V, and 4.35-V Chemistries
  • 9-pin 1.62 × 1.58 mm, 0.5 mm pitch YZF package
  • Single-Cell Li-Ion Battery Fuel Gauge
    • Resides on System Board
    • Supports Embedded or Removable Batteries
    • Powered Directly from Battery with Integrated
      LDO
  • Easy To Configure Fuel Gauging Based on the
    Dynamic Voltage Correlation Algorithm
    • Reports Remaining Capacity and State of
      Charge (SOC) with Smoothing Filter
    • Automatically Adjusts for Self-Discharge,
      Temperature, and Rate Changes
  • Microcontroller Peripheral Supports:
    • 400-kHz I2C Serial Interface
    • Configurable SOC Interrupt or
      Battery Low Digital Output Warning
    • Internal Temperature Sensor or
      Host Reported Temperature
  • Support 4.2-V, 4.3-V, and 4.35-V Chemistries
  • 9-pin 1.62 × 1.58 mm, 0.5 mm pitch YZF package

The Texas Instruments bq27621-G1 is a minimally configured microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires very little user configuration and system microcontroller firmware development.

The bq27621-G1 uses the Dynamic Voltage Correlation algorithm for fuel gauging. This process eliminates the need for a sense resistor when calculating remaining battery capacity (mAh), state-of-charge (%), battery voltage (mV), and temperature (°C).

Battery fuel gauging with the bq27621-G1 requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-pin, 1.62 mm × 1.58 mm, 0.5 mm pitch YZF package is ideal for space-constrained applications.

The Texas Instruments bq27621-G1 is a minimally configured microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires very little user configuration and system microcontroller firmware development.

The bq27621-G1 uses the Dynamic Voltage Correlation algorithm for fuel gauging. This process eliminates the need for a sense resistor when calculating remaining battery capacity (mAh), state-of-charge (%), battery voltage (mV), and temperature (°C).

Battery fuel gauging with the bq27621-G1 requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-pin, 1.62 mm × 1.58 mm, 0.5 mm pitch YZF package is ideal for space-constrained applications.
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Technical documentation

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Type Title Date
* Data sheet bq27621-G1 System-Side Fuel Gauge With Dynamic Voltage Correlation datasheet (Rev. E) PDF | HTML 06 Jan 2016
* User guide BQ27621-G1 Technical Reference Manual (Rev. C) 27 Aug 2014
User guide Quick Start Guide for bq27621-G1 (Rev. A) 20 Jan 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

BQ27621EVM-G1 — System-Side Fuel (Gas) Gauge Dynamic Voltage Correlation Evaluation Module

The BQ27621EVM-G1A evaluation module is a complete evaluation system for the bq27621-G1. The EVM includes one bq27621-G1 circuit module using DVC algorithm.  The bq27621-G1 should be used with batteries with a charge voltage from 4.2 volts to 4.35 volts.  A separate orderable EV2300 or (...)

User guide: PDF
Not available on TI.com
Interface adapter

EV2400 — USB-Based PC Interface Board for Battery Fuel (Gas) Gauge Evaluation Module

The EV2400 EVM interface board enables an IBM-compatible or other type PC (with the required driver for its particular platform) to communicate with the Texas Instruments SMBus or I2C interface gas gauges via a Universal Serial Bus (USB) port. In addition to this board, PC software is required to (...)

User guide: PDF
Not available on TI.com
Application software & framework

BQSTUDIO-STABLE — Battery Management Studio (bqStudio) Software – stable version downloads for bq series of TI battery fuel gauges

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
  • BQ76942 — 3-series to 10-series multicell battery monitor and protector
  • BQ76952 — 3-s to 16-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4
Battery charger ICs
  • BQ24800 — SMBus 1-4 cell Buck battery charge controller to support hybrid power boost and battery boost mode
  • BQ25720 — SMBus 1- to 4-cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG
  • BQ25723 — I²C 1-4 cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG
  • BQ25731 — I2C 1-5 cell NVDC buck-boost battery charge controller with USB type-C PD support
  • BQ25790 — Integrated, NVDC, 5-A 1-cell to 4-cell switch-mode buck-boost battery charger
  • BQ25792 — I2C controlled, 5-A, 1-4 cell buck-boost charger with dual-input selector and USB PD 3.0 OTG output
Battery fuel gauges
  • BQ27220 — Single cell pack/system-side CEDV battery fuel (gas) gauge w/pre-programmed chemistry profiles
  • BQ27320 — Single cell pack/System-side CEDV battery fuel (gas) gauge
  • BQ27425-G1 — System-side Impedance Track™; fuel gauge with direct battery connection | gas gauge battery
  • BQ27425-G2A — System-side Impedance Track™; fuel gauge for LiCoO2 battery
  • BQ27425-G2B — System-side Impedance Track™; fuel gauge LiMn2O4 battery
  • BQ27520-G4 — System side Impedance Track™ fuel gauge with integrated LDO.
  • BQ27530-G1 — System-side Impedance-Track fuel (gas) gauge with direct battery connection
  • BQ27531-G1 — Battery management unit Impedance Track™ fuel (gas) gauge for bq2419x charger controller
  • BQ27532-G1 — Battery management unit Impedance Track™ fuel gauge for bq2425x charger
  • BQ27545-G1 — Single cell, pack side, Impedance Track™ fuel gauge
  • BQ27546-G1 — Single cell Impedance Track™ pack side fuel gauge with DSBGA package
  • BQ27621-G1 — System-side fuel gauge with Dynamic Voltage Correlation, battery gas gauge
  • BQ27741-G1 — Pack-side Impedance Track™(tm) fuel (gas) gauge with integrated protector
  • BQ27742-G1 — Single cell Li-ion battery fuel gauge with integrated protection | battery gas gauge
  • BQ27Z561 — Impedance Track™ integrated circuit gas gauge solution for 1-series
  • BQ28Z610 — Battery fuel gauge with integrated protector for 1-2 series packs
  • BQ34110 — Multi-chemistry high-cell Count battery fuel gauge with integrated rarely discharged module
  • BQ34210-Q1 — Automotive Qualified Single cell system-side CEDV fuel gauge
  • BQ34Z100-G1 — Multi-chemistry Impedance Track™ standalone fuel gauge | battery gas gauge
  • BQ35100 — Battery fuel gauge for non-rechargeable batteries (lithium primary) and end-of-service monitor
  • BQ4050 — 1-4 series CEDV battery fuel (gas) gauge
  • BQ40Z50 — 1-4 series Li-ion battery pack manager | battery fuel (gas) gauge
  • BQ40Z50-R1 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 1.0
  • BQ40Z50-R2 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0
  • BQ40Z60 — Complete multi-cell battery manager | battery fuel (gas) gauge
  • BQ40Z80 — 2-s to 6-s battery pack manager with Impedance Track™ gas gauging
  • BQ78350 — Companion CEDV Fuel Gauge Battery Management Controller for bq76940 Monitor Family
  • BQ78350-R1 — CEDV li-ion gas gauge and battery management controller
  • BQ78Z100 — Impedance Track™ battery fuel (gas) gauge for 1-series to 2-series
Download options
Application software & framework

BQSTUDIO-TEST — Battery Management Studio (bqStudio) Software – Beta version downloads

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
  • BQ76905 — Low-power monitor and protector for 2S to 5S with high accuracy cell voltage measurement
  • BQ76907 — Low-power monitor and protector for 2S to 7S with high accuracy cell voltage measurement
  • BQ769142 — 3-s to 14-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4 battery
  • BQ76942 — 3-series to 10-series multicell battery monitor and protector
  • BQ76952 — 3-s to 16-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4
  • BQ76972 — 3s-to-16s high-accuracy battery monitor and protector for Li-ion, Li-poly and LiFePO4
Battery charger ICs
  • BQ24800 — SMBus 1-4 cell Buck battery charge controller to support hybrid power boost and battery boost mode
  • BQ25720 — SMBus 1- to 4-cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG
  • BQ25723 — I²C 1-4 cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG
  • BQ25731 — I2C 1-5 cell NVDC buck-boost battery charge controller with USB type-C PD support
  • BQ25756 — Stand-alone or I²C-controlled 70-V bidirectional buck-boost charge controller with MPPT
  • BQ25790 — Integrated, NVDC, 5-A 1-cell to 4-cell switch-mode buck-boost battery charger
  • BQ25792 — I2C controlled, 5-A, 1-4 cell buck-boost charger with dual-input selector and USB PD 3.0 OTG output
Battery fuel gauges
  • BQ27220 — Single cell pack/system-side CEDV battery fuel (gas) gauge w/pre-programmed chemistry profiles
  • BQ27320 — Single cell pack/System-side CEDV battery fuel (gas) gauge
  • BQ27425-G1 — System-side Impedance Track™; fuel gauge with direct battery connection | gas gauge battery
  • BQ27425-G2A — System-side Impedance Track™; fuel gauge for LiCoO2 battery
  • BQ27425-G2B — System-side Impedance Track™; fuel gauge LiMn2O4 battery
  • BQ27427 — Single-cell battery fuel gauge with pre-programmed chemistry and integrated sense resistor
  • BQ27520-G4 — System side Impedance Track™ fuel gauge with integrated LDO.
  • BQ27530-G1 — System-side Impedance-Track fuel (gas) gauge with direct battery connection
  • BQ27531-G1 — Battery management unit Impedance Track™ fuel (gas) gauge for bq2419x charger controller
  • BQ27532-G1 — Battery management unit Impedance Track™ fuel gauge for bq2425x charger
  • BQ27545-G1 — Single cell, pack side, Impedance Track™ fuel gauge
  • BQ27546-G1 — Single cell Impedance Track™ pack side fuel gauge with DSBGA package
  • BQ27621-G1 — System-side fuel gauge with Dynamic Voltage Correlation, battery gas gauge
  • BQ27741-G1 — Pack-side Impedance Track™(tm) fuel (gas) gauge with integrated protector
  • BQ27742-G1 — Single cell Li-ion battery fuel gauge with integrated protection | battery gas gauge
  • BQ27Z561 — Impedance Track™ integrated circuit gas gauge solution for 1-series
  • BQ27Z746 — Pack-side, single-cell Impedance Track™ technology fuel gauge with integrated protector
  • BQ28Z610 — Battery fuel gauge with integrated protector for 1-2 series packs
  • BQ34110 — Multi-chemistry high-cell Count battery fuel gauge with integrated rarely discharged module
  • BQ34210-Q1 — Automotive Qualified Single cell system-side CEDV fuel gauge
  • BQ34Z100-G1 — Multi-chemistry Impedance Track™ standalone fuel gauge | battery gas gauge
  • BQ35100 — Battery fuel gauge for non-rechargeable batteries (lithium primary) and end-of-service monitor
  • BQ4050 — 1-4 series CEDV battery fuel (gas) gauge
  • BQ40Z50 — 1-4 series Li-ion battery pack manager | battery fuel (gas) gauge
  • BQ40Z50-R1 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 1.0
  • BQ40Z50-R2 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0
  • BQ40Z60 — Complete multi-cell battery manager | battery fuel (gas) gauge
  • BQ40Z80 — 2-s to 6-s battery pack manager with Impedance Track™ gas gauging
  • BQ78350 — Companion CEDV Fuel Gauge Battery Management Controller for bq76940 Monitor Family
  • BQ78350-R1 — CEDV li-ion gas gauge and battery management controller
  • BQ78Z100 — Impedance Track™ battery fuel (gas) gauge for 1-series to 2-series
Battery protectors
  • BQ77307 — Low-power protector for 2S to 7S with high accuracy cell voltage measurement
Hardware development
Evaluation board
Download options
Application software & framework

GPCCHEM — Gauging Parameter Calculator: Match chemistry for Impedance Track gauges

GPC Chemistry ID matching for Impedance Track (IT) algorithm gas gauges (Find closest chemistry match) must be done before Optimizing room temperature or low temperature performance.

Gauging Parameter Calculator Chemistry ID matching for Impedance track gas gauges (GPCCHEM) is a math calculation (...)

View Options
Application software & framework

GPCRA0 — Gauging Parameter Calculator: Optimize room temperature performance for Impedance Track gauges

Gauging Parameter Calculator – Optimize room temperature performance for Impedance track gas gauges (GPCRA0) / Golden GG Maker is a math calculation tool that helps the battery designer to refine the Impedance Track battery gauge parameters for a given battery profile. It provides optimized (...)
View Options
Driver or library

BQ27XXXSW-LINUX — Linux Driver for BQ27XXX

The Linux driver supports the BQ27x series of Battery Fuel Gauges. The Linux driver supports communication through the I2C/HDQ bus and interfaces with the power supply sub-system to monitor battery properties.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

(...)

View Options
Support software

BQEVSW-MKST-UPDATE — Software Update to enable BQEVSW to use MKST-3P-ALT-EV2300

BQ-BATTERY-PROGRAMMER-SW software development kit (SDK) is a collection of robust software command line tools that assist with the process of programming, testing, or assembling packs that use TI Battery management products. The executables in this software work with the MKST-3P-ALT-EV2300 MKS (...)

Supported products & hardware

Supported products & hardware

Products
Battery fuel gauges
  • BQ2083-V1P3 — SBS-compliant gas gauge for use with bq29311
  • BQ20Z40 — SBS Compliant Gas Gauge with Impedance Track Technology for use with BQ29330
  • BQ20Z40-R1 — SBS 1.1 compliant Gas Gauge with Impedance Track™ Technology
  • BQ20Z45 — SBS 1.1 compliant Gas Gauge with Impedance Track Technology and Advanced Charging Algorithm
  • BQ20Z70-V150 — SBS 1.1-compliant gas gauge enabled with Impedance Track™ technology
  • BQ20Z70-V160 — SBS 1.1-compliant gas gauge enabled with Impedance Track™ technology for use with the bq29330
  • BQ20Z80 — SBS 1.1-compliant gas gauge enabled with Impedance Track™; technology for use with the bq29312
  • BQ20Z80-V102 — SBS 1.1-compliant gas gauge enabled w/Impedance Track™ technology
  • BQ20Z80-V110 — SBS 1.1-compliant gas gauge enabled w/Impedance Track™ technology with FW v1.10
  • BQ20Z80A-V110 — SBS 1.1 compliant gas gauge enabled with Impedance Track™; technology for use with the bq29312A
  • BQ27411-G1 — Pack-side Impedance Track™ fuel gauge | battery gas gauge
  • BQ27421-G1 — System-side(tm) fuel gauge with integrated Sense Resistor | battery gas gauge
  • BQ27425-G1 — System-side Impedance Track™; fuel gauge with direct battery connection | gas gauge battery
  • BQ27425-G2A — System-side Impedance Track™; fuel gauge for LiCoO2 battery
  • BQ27425-G2B — System-side Impedance Track™; fuel gauge LiMn2O4 battery
  • BQ27426 — Single cell System-side battery fuel (gas) gauge w/Pre-programmed chemistry Profile
  • BQ27427 — Single-cell battery fuel gauge with pre-programmed chemistry and integrated sense resistor
  • BQ27441-G1 — System-side Impedance Track™ battery fuel (gas) gauge
  • BQ27505-J2 — System-side Impedance Track™; fuel gauge with FW v2.15
  • BQ27505-J3 — System-side Impedance Track™; fuel gauge with FW v2.20
  • BQ27505-J4 — System-side Impedance Track™; fuel gauge with FW v2.24
  • BQ27505-J5 — System-side Impedance Track™; fuel gauge with FW v2.29
  • BQ27520-G4 — System side Impedance Track™ fuel gauge with integrated LDO.
  • BQ27530-G1 — System-side Impedance-Track fuel (gas) gauge with direct battery connection
  • BQ27531-G1 — Battery management unit Impedance Track™ fuel (gas) gauge for bq2419x charger controller
  • BQ27532-G1 — Battery management unit Impedance Track™ fuel gauge for bq2425x charger
  • BQ27545-G1 — Single cell, pack side, Impedance Track™ fuel gauge
  • BQ27546-G1 — Single cell Impedance Track™ pack side fuel gauge with DSBGA package
  • BQ27621-G1 — System-side fuel gauge with Dynamic Voltage Correlation, battery gas gauge
  • BQ27741-G1 — Pack-side Impedance Track™(tm) fuel (gas) gauge with integrated protector
  • BQ27742-G1 — Single cell Li-ion battery fuel gauge with integrated protection | battery gas gauge
  • BQ3050 — SBS 1.1-compliant 2-s to 4-s battery gas gauge & protection
  • BQ3055 — 2-series, 3-series, and 4-series Li-ion battery pack manager
  • BQ3060 — SBS 1.1-compliant gas gauge and protector
  • BQ30Z554-R1 — 2 series, 3 series, and 4 series Li-ion battery pack manager
  • BQ34110 — Multi-chemistry high-cell Count battery fuel gauge with integrated rarely discharged module
  • BQ34Z100 — 1-s to 16-s Impedance Track™ fuel gauge | battery gas gauge
  • BQ34Z100-G1 — Multi-chemistry Impedance Track™ standalone fuel gauge | battery gas gauge
  • BQ34Z100-R2 — Multichemistry Impedance Track™ stand-alone fuel gauge
  • BQ34Z110 — Wide range fuel gauge with Impedance Track™; for lead acid batteries | battery gas gauge
Hardware development
Evaluation board
  • BQ2000EVM — Evaluation Module for Battery Charge Management IC
  • BQ2022AEVM-001 — BQ2022A Evaluation Module
  • BQ27411EVM-G1A — Pack-Side Impedance Track™ Fuel (Gas) Gauge Evaluation Module
  • BQ27411EVM-G1C — BQ27411EVM-G1C Pack-Side Impedance Track™ Fuel (Gas) Gauge Evaluation Module
  • BQ27421EVM-G1A — BQ27421EVM-G1A System-Side Battery Fuel (Gas) Gauge Evaluation Module Board
  • BQ27421EVM-G1B — BQ27421EVM-G1B System-Side Battery Fuel (Gas) Gauge Evaluation Module
  • BQ27425EVM-G2A — BQ27425EVM-G2A System-Side Impedance Track™ Fuel (Gas) Gauge Evaluation Module
  • BQ27426EVM-738 — BQ27426 EVM for Impedance Track Fuel Gauge w/Easy to Use Pre-programmed Chemistry Profiles
  • BQ27427EVM — BQ27427 evaluation module for Impedance Track™ battery gas gauge with integrated sense resistor
  • BQ27441EVM-G1A — BQ27441 evaluation board 
  • BQ27441EVM-G1B — BQ27441 evaluation board 
  • BQ27510EVM — System-Side Single-Cell Impedance Track™ Technology Evaluation Module  | Battery Fuel Gauge
  • BQ27520EVM — System-Side Impedance Track™ Battery Fuel Gauge Evaluation Module | Gas Gauge
  • BQ27530EVM — BQ27530EVM System-Side Impedance-Track Fuel (Gas) Gauge Direct Battery Connection Evaluation Module
  • BQ27531EVM — Battery Management Unit Impedance Track Fuel (Gas) Gauge Charger Controller Evaluation Module
  • BQ27532EVM-656 — Battery Charging Solution Evaluation Module
  • BQ27542EVM — Li-ion Battery Fuel Gauge Evaluation Module
  • BQ27546EVM-702 — bq27546 Gas Gauge with Impedance Track™ Technology
  • BQ27621EVM-G1 — System-Side Fuel (Gas) Gauge Dynamic Voltage Correlation Evaluation Module
  • BQ27741EVM — BQ27741EVM Pack-Side Impedance Track Fuel (Gas) Gauge Integrated Protector Evaluation Module
  • BQ27742EVM — bq27742-G1 Single Cell Li-ion Battery Fuel (Gas) Gauge Programmable Evaluation Module
  • BQ27750EVM-837 — BQ27750 1-Cell Programmable Battery Manager Evaluation Module
  • BQ3050EVM-001 — bq3050EVM SBS 1.1 Compliant Advanced Gas Gauge EVM
  • BQ34110EVM-796 — bq34110 Multi-Chemistry CEDV Battery Gas Gauge for Rarely Discharged Applications Evaluation Module
  • BQ34210IQ1EVM-826 — bq34210-Q1 Evaluation Module for System Side CEDV Fuel Gauge
  • BQ34Z100EVM — Bq34z100EVM 1s to 16s Impedance Track Fuel Gauge Battery Evaluation Module | Gas Gauge Battery
  • MKST-3P-ALT-EV2300 — MKS Technology alternative for EV2300 communications transceiver
Software
Support software
Application software & framework
  • BQEVSW — BQ evaluation software (BQEVSW) v0.0.92 for BQ30Z554-R1
Download options
Reference designs

TIDA-00252 — Voltage Based Gas Gauge Reference Design

The Texas Instruments bq27621-G1 is an easy to configure microcontroller peripheral that provides system-side fuel gauging for single-cell Li-ion batteries. This device requires minimal user configuration and system microntroller development. The design will provide State of Charge indication for (...)
Test report: PDF
Schematic: PDF
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DSBGA (YZF) 9 Ultra Librarian
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