Batterie Venus E V3.0 modbus extract

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Register

 Notes
30000 Alternative for battery_voltage (32100). scale 0.1 V, uint16. Less precise.
30002 Alternative for internal_temperature (35000). scale 0.1 °C, int16. Duplicate.
30003 Alternative for internal_mos1_temperature (35001). scale 0.1 °C, int16. Duplicate.
30004 Alternative for inverter_voltage (32200). scale 0.1 V, uint16. Duplicate.
30005 Alternative for ac_offgrid_voltage (32300). scale 0.1 V, uint16. Duplicate.
30007 Alternative for ac_offgrid_power (32302). scale 1 W, int16. Duplicate.
30100 Alternative for battery_voltage (32100). scale 0.01 V, uint16. Inferior.
30102 Alternative for max_cell_voltage (37007). scale 0.001 V. Inferior.
30103 Alternative for min_cell_voltage (37008). scale 0.001 V. Inferior.
30104 Alternative for max_cell_temperature (35010). scale 0.01 °C, uint16. Inferior.
30105 Alternative for min_cell_temperature (35011). scale 0.01 °C, uint16. Inferior.
30107 Alternative for bms_temperature_1 (34011). scale 0.1 °C, int16. Duplicate.
30108 Alternative for bms_temperature_2 (34012). scale 0.1 °C, int16. Duplicate.
30210 Alternative for bms_code (34004). uint16. Duplicate.
30212 Unknown. Constant value 5 in all tested modes. Static across mode changes. Adjacent to 30210. Possibly another sub-version or config index.
32101 Unknown. Internal EMS state indicator — does not map to inverter_state or user_work_mode. Small integers (4–42) = active app-controlled charge/discharge; 0x9999 (39321) = app idle/bypass; 0x9967 (39271) = RS485-controlled discharge. Sentinel values may encode control source. Observed values: UPS 300W=4, Manual 450W=7, Manual 2500W=42, Manual 2500W (SoC>=95%)=30, Manual 500W=8, Manual 300W=4, Bypass/Stop=39321, RS485 discharge 2500W=39271.
32104 Alternative for battery_soc_int (37005). scale 1 %, uint16. Duplicate.
32106 Possibly alternative for 35111. Unclear semantics.
32107 Possibly alternative for 35112. Unclear semantics.
32108 Alternative for max_cell_temperature (35010). scale 0.1 °C. Inferior.
32109 Alternative for bms_online (37000). uint16. Duplicate.
32301 Alternative for ac_offgrid_current (calculated). Returns same value as 32300 (voltage, not current) — unusable for current measurement. ac_offgrid_current is calculated as ac_offgrid_power / ac_offgrid_voltage instead.
34000 Alternative for battery_voltage (32100). scale 0.01 V, uint16. Inferior.
34001 Alternative for battery_current (30101). scale 0.1 A, int16. Duplicate.
34005 Alternative for max_cell_voltage (37007). scale 0.001 V. Inferior.
34006 Alternative for min_cell_voltage (37008). scale 0.001 V. Inferior.
34010 Alternative for bms_version (30204). uint16. Inferior.
34017 Alternative for bms_status (30106). uint16. Duplicate.
35110 Unknown. Value 576 in active charge modes (UPS/Manual), 0 in initial scan. Did not change between different charge modes. Purpose unclear.
35111 Unknown. Changes with mode AND SoC — not a live power setpoint (constant within a snapshot while actual power varied). Observed: Charge (all)=330, Discharge 2500W SoC46%=1000, Discharge 2500W SoC25%=330. 330x0.1=33A, possibly a BMS current limit.
35112 Unknown. Same behaviour as 35111. Observed: Charge (all)=1000, Discharge 2500W SoC46%=750, Discharge 2500W SoC25%=500.
36000 Unknown. uint32, count 2. Possibly alarm bitmask. Individual bit semantics unknown.
36100 Unknown. uint32, count 2. Possibly fault bitmask. Individual bit semantics unknown.
37006 Alternative for cell_temperature_1 (34013). scale 0.1 °C, int16. Duplicate.
37012 Alternative for bms_version (30204). uint16. Inferior.
37016 Alternative for ac_voltage (36103). scale 0.1 V, uint16. Duplicate.
45603 Unknown. Value 9985 (0x2701). Adjacent to 45604/45605. Possibly WiFi channel, frequency, or AP info. Not confirmed.
45604 Unknown. Value 20599 (0x5077). Adjacent to 45603/45605. Possibly WiFi channel, frequency, or AP info. Not confirmed.
45605 Unknown. Constant value 74 in V148 scan. Adjacent to 45603/45604.
47400 Unknown. Value 43707 (0xAABB) in V148 scan. Alternating-nibble sentinel — same class as 0x9999, likely "not configured" / undefined.

 

Modbus Registers Used complementary information

 

Register definitions live in custom_components/marstek_modbus/registers/.

Key / Name Description Type Bytes Scale Unit a d e_v12 e_v3
device_name Device name (string) char 20 - - 31000 31000 31000 31000
sn_code Device serial / SN code char 20 - -     31200  
software_version Device software version uint16 2 0.01 -     31100  
bms_version BMS firmware version uint16 2 - - 30204 30204 31102 30204
vms_version VMS firmware version uint16 2 - - 30202 30202   30202
ems_version EMS firmware version (special formatting) uint16 2 1 - 30200 30200 31101 30200
mac_address MAC address char 12 - - 30304 30304 30402 30304
comm_module_firmware Communication module firmware char 12 - - 30350 30350 30800 30350
wifi_signal_strength WiFi RSSI uint16 2 -1 dBm 30303 30303 30303 30303
bluetooth_status Bluetooth connectivity/status uint16 2 - - 30301 30301 30301 30301
wifi_status (binary) WiFi connected (0/1) uint16 2 1 - 30300 30300 30300 30300
cloud_status (binary) Cloud connected (0/1) uint16 2 1 - 30302 30302 30302 30302
battery_soc State of charge uint16 2 0.1/1 % 34002 34002 32104 34002
battery_total_energy Total stored energy uint16 2 0.001 kWh 32105 32105 32105 32105
battery_voltage Battery voltage uint16 2 0.01 V 30100 30100 32100 30100
battery_current Battery current int16 2 0.1/0.01 A 30101 30101 32101 30101
battery_power Battery power int16/32 2/4 1 W 30001 30001 32102 30001
total_charging_energy Total charging energy uint32 4 0.01 kWh 33000 33000 33000 33000
total_discharging_energy Total discharging energy int32 4 0.01 kWh 33002 33002 33002 33002
total_daily_charging_energy Total daily charging energy uint32 4 0.01 kWh 33004 33004 33004 33004
total_daily_discharging_energy Total daily discharging energy int32 4 0.01 kWh 33006 33006 33006 33006
total_monthly_charging_energy Total monthly charging energy uint32 4 0.01 kWh 33008 33008 33008 33008
total_monthly_discharging_energy Total monthly discharging energy int32 4 0.01 kWh 33010 33010 33010 33010
battery_cycle_count Native cycle counter uint16 2 1 - 34003 34003   34003
ac_voltage AC voltage uint16 2 0.1 V 32200 32200 32200 32200
ac_current AC current int16 2 0.004/0.01 A 37004 37004 32201 37004
ac_power AC power int16/32 2/4 1 W 30006 30006 32202 30006
ac_frequency AC frequency int16 2 0.1/0.01 Hz 32204 32204 32204 32204
ac_offgrid_voltage AC offgrid voltage uint16 2 0.1 V 32300 32300 32300 32300
ac_offgrid_current AC offgrid current uint16 2 0.01 A 32301 32301 32301 32301
ac_offgrid_power AC offgrid power int32 4 1 W 32302 32302 32302 32302
internal_temperature Internal device temperature int16 2 0.1 °C 35000 35000 35000 35000
internal_mos1_temperature MOS1 internal temperature int16 2 0.1 °C 35001 35001 35001 35001
internal_mos2_temperature MOS2 internal temperature int16 2 0.1 °C 35002 35002 35002 35002
max_cell_temperature Max cell temperature int16 2 0.1/1 °C 35010 35010 35010 35010
max_cell_voltage Max cell voltage uint16 2 0.001 V 37007 37007 37007 37007
min_cell_voltage Min cell voltage uint16 2 0.001 V 37008 37008 37008 37008
battery_1_cell_1_voltage Battery pack 1 cell 1 voltage int16 2 0.001 V 34018 34018   34018
battery_1_cell_2_voltage Battery pack 1 cell 2 voltage int16 2 0.001 V 34019 34019   34019
battery_1_cell_3_voltage Battery pack 1 cell 3 voltage int16 2 0.001 V 34020 34020   34020
battery_1_cell_4_voltage Battery pack 1 cell 4 voltage int16 2 0.001 V 34021 34021   34021
battery_1_cell_5_voltage Battery pack 1 cell 5 voltage int16 2 0.001 V 34022 34022   34022
battery_1_cell_6_voltage Battery pack 1 cell 6 voltage int16 2 0.001 V 34023 34023   34023
battery_1_cell_7_voltage Battery pack 1 cell 7 voltage int16 2 0.001 V 34024 34024   34024
battery_1_cell_8_voltage Battery pack 1 cell 8 voltage int16 2 0.001 V 34025 34025   34025
battery_1_cell_9_voltage Battery pack 1 cell 9 voltage int16 2 0.001 V 34026 34026   34026
battery_1_cell_10_voltage Battery pack 1 cell 10 voltage int16 2 0.001 V 34027 34027   34027
battery_1_cell_11_voltage Battery pack 1 cell 11 voltage int16 2 0.001 V 34028 34028   34028
battery_1_cell_12_voltage Battery pack 1 cell 12 voltage int16 2 0.001 V 34029 34029   34029
battery_1_cell_13_voltage Battery pack 1 cell 13 voltage int16 2 0.001 V 34030 34030   34030
battery_1_cell_14_voltage Battery pack 1 cell 14 voltage int16 2 0.001 V   34031   34031
battery_1_cell_15_voltage Battery pack 1 cell 15 voltage int16 2 0.001 V   34032   34032
battery_1_cell_16_voltage Battery pack 1 cell 16 voltage int16 2 0.001 V   34033   34033
battery_2_cell_1_voltage Battery pack 2 cell 1 voltage int16 2 0.001 V 34031      
battery_2_cell_2_voltage Battery pack 2 cell 2 voltage int16 2 0.001 V 34032      
battery_2_cell_3_voltage Battery pack 2 cell 3 voltage int16 2 0.001 V 34033      
battery_2_cell_4_voltage Battery pack 2 cell 4 voltage int16 2 0.001 V 34034      
battery_2_cell_5_voltage Battery pack 2 cell 5 voltage int16 2 0.001 V 34035      
battery_2_cell_6_voltage Battery pack 2 cell 6 voltage int16 2 0.001 V 34036      
battery_2_cell_7_voltage Battery pack 2 cell 7 voltage int16 2 0.001 V 34037      
battery_2_cell_8_voltage Battery pack 2 cell 8 voltage int16 2 0.001 V 34038      
battery_2_cell_9_voltage Battery pack 2 cell 9 voltage int16 2 0.001 V 34039      
battery_2_cell_10_voltage Battery pack 2 cell 10 voltage int16 2 0.001 V 34040      
battery_2_cell_11_voltage Battery pack 2 cell 11 voltage int16 2 0.001 V 34041      
battery_2_cell_12_voltage Battery pack 2 cell 12 voltage int16 2 0.001 V 34042      
battery_2_cell_13_voltage Battery pack 2 cell 13 voltage int16 2 0.001 V 34043      
battery_3_cell_1_voltage Battery pack 3 cell 1 voltage int16 2 0.001 V 34044      
battery_3_cell_2_voltage Battery pack 3 cell 2 voltage int16 2 0.001 V 34045      
battery_3_cell_3_voltage Battery pack 3 cell 3 voltage int16 2 0.001 V 34046      
battery_3_cell_4_voltage Battery pack 3 cell 4 voltage int16 2 0.001 V 34047      
battery_3_cell_5_voltage Battery pack 3 cell 5 voltage int16 2 0.001 V 34048      
battery_3_cell_6_voltage Battery pack 3 cell 6 voltage int16 2 0.001 V 34049      
battery_3_cell_7_voltage Battery pack 3 cell 7 voltage int16 2 0.001 V 34050      
battery_3_cell_8_voltage Battery pack 3 cell 8 voltage int16 2 0.001 V 34051      
battery_3_cell_9_voltage Battery pack 3 cell 9 voltage int16 2 0.001 V 34052      
battery_3_cell_10_voltage Battery pack 3 cell 10 voltage int16 2 0.001 V 34053      
battery_3_cell_11_voltage Battery pack 3 cell 11 voltage int16 2 0.001 V 34054      
battery_3_cell_12_voltage Battery pack 3 cell 12 voltage int16 2 0.001 V 34055      
battery_3_cell_13_voltage Battery pack 3 cell 13 voltage int16 2 0.001 V 34056      
battery_4_cell_1_voltage Battery pack 4 cell 1 voltage int16 2 0.001 V 34057      
battery_4_cell_2_voltage Battery pack 4 cell 2 voltage int16 2 0.001 V 34058      
battery_4_cell_3_voltage Battery pack 4 cell 3 voltage int16 2 0.001 V 34059      
battery_4_cell_4_voltage Battery pack 4 cell 4 voltage int16 2 0.001 V 34060      
battery_4_cell_5_voltage Battery pack 4 cell 5 voltage int16 2 0.001 V 34061      
battery_4_cell_6_voltage Battery pack 4 cell 6 voltage int16 2 0.001 V 34062      
battery_4_cell_7_voltage Battery pack 4 cell 7 voltage int16 2 0.001 V 34063      
battery_4_cell_8_voltage Battery pack 4 cell 8 voltage int16 2 0.001 V 34064      
battery_4_cell_9_voltage Battery pack 4 cell 9 voltage int16 2 0.001 V 34065      
battery_4_cell_10_voltage Battery pack 4 cell 10 voltage int16 2 0.001 V 34066      
battery_4_cell_11_voltage Battery pack 4 cell 11 voltage int16 2 0.001 V 34067      
battery_4_cell_12_voltage Battery pack 4 cell 12 voltage int16 2 0.001 V 34068      
battery_4_cell_13_voltage Battery pack 4 cell 13 voltage int16 2 0.001 V 34069      
battery_5_cell_1_voltage Battery pack 5 cell 1 voltage int16 2 0.001 V 34070      
battery_5_cell_2_voltage Battery pack 5 cell 2 voltage int16 2 0.001 V 34071      
battery_5_cell_3_voltage Battery pack 5 cell 3 voltage int16 2 0.001 V 34072      
battery_5_cell_4_voltage Battery pack 5 cell 4 voltage int16 2 0.001 V 34073      
battery_5_cell_5_voltage Battery pack 5 cell 5 voltage int16 2 0.001 V 34074      
battery_5_cell_6_voltage Battery pack 5 cell 6 voltage int16 2 0.001 V 34075      
battery_5_cell_7_voltage Battery pack 5 cell 7 voltage int16 2 0.001 V 34076      
battery_5_cell_8_voltage Battery pack 5 cell 8 voltage int16 2 0.001 V 34077      
battery_5_cell_9_voltage Battery pack 5 cell 9 voltage int16 2 0.001 V 34078      
battery_5_cell_10_voltage Battery pack 5 cell 10 voltage int16 2 0.001 V 34079      
battery_5_cell_11_voltage Battery pack 5 cell 11 voltage int16 2 0.001 V 34080      
battery_5_cell_12_voltage Battery pack 5 cell 12 voltage int16 2 0.001 V 34081      
battery_5_cell_13_voltage Battery pack 5 cell 13 voltage int16 2 0.001 V 34082      
battery_6_cell_1_voltage Battery pack 6 cell 1 voltage int16 2 0.001 V 34083      
battery_6_cell_2_voltage Battery pack 6 cell 2 voltage int16 2 0.001 V 34084      
battery_6_cell_3_voltage Battery pack 6 cell 3 voltage int16 2 0.001 V 34085      
battery_6_cell_4_voltage Battery pack 6 cell 4 voltage int16 2 0.001 V 34086      
battery_6_cell_5_voltage Battery pack 6 cell 5 voltage int16 2 0.001 V 34087      
battery_6_cell_6_voltage Battery pack 6 cell 6 voltage int16 2 0.001 V 34088      
battery_6_cell_7_voltage Battery pack 6 cell 7 voltage int16 2 0.001 V 34089      
battery_6_cell_8_voltage Battery pack 6 cell 8 voltage int16 2 0.001 V 34090      
battery_6_cell_9_voltage Battery pack 6 cell 9 voltage int16 2 0.001 V 34091      
battery_6_cell_10_voltage Battery pack 6 cell 10 voltage int16 2 0.001 V 34092      
battery_6_cell_11_voltage Battery pack 6 cell 11 voltage int16 2 0.001 V 34093      
battery_6_cell_12_voltage Battery pack 6 cell 12 voltage int16 2 0.001 V 34094      
battery_6_cell_13_voltage Battery pack 6 cell 13 voltage int16 2 0.001 V 34095      
mppt1_voltage MPPT1 array voltage uint16 2 0.1 V 30020 30020    
mppt1_current MPPT1 array current uint16 2 0.1 A 30024 30024    
mppt1_power MPPT1 array power uint16 2 0.1 W 30037 30037    
mppt2_voltage MPPT2 array voltage uint16 2 0.1 V 30021 30021    
mppt2_current MPPT2 array current uint16 2 0.1 A 30025 30025    
mppt2_power MPPT2 array power uint16 2 0.1 W 30038 30038    
mppt3_voltage MPPT3 array voltage uint16 2 0.1 V 30022 30022    
mppt3_current MPPT3 array current uint16 2 0.1 A 30026 30026    
mppt3_power MPPT3 array power uint16 2 0.1 W 30039 30039    
mppt4_voltage MPPT4 array voltage uint16 2 0.1 V 30023 30023    
mppt4_current MPPT4 array current uint16 2 0.1 A 30027 30027    
mppt4_power MPPT4 array power uint16 2 0.1 W 30040 30040    
inverter_state Inverter / device state uint16 2 1 - 35100 35100 35100 35100
fault_status Fault status bits uint64 8 - -     36100  
alarm_status Alarm status bits uint32 4 - -     36000  
modbus_address Modbus slave/unit id uint16 2 - - 41100 41100 41100 41100
rs485_control_mode (switch) RS485 control mode (write commands) uint16 2 - - 42000 42000 42000 42000
backup_function (switch) Backup function control uint16 2 - - 41200 41200 41200 41200
force_mode (select) Force mode (None/Charge/Discharge) uint16 2 - - 42010 42010 42010 42010
user_work_mode (select) User Work Mode (manual/anti_feed/trade) uint16 2 - - 43000 43000 43000 43000
discharge_limit_mode (binary) Discharge limit mode (diagnostic) uint16 2 - -     41010  
grid_standard (select) Grid standard / region selection uint16 2 - -     44100  
charge_to_soc (number) Charge/discharge to SOC (0-100%) uint16 2 1 % 42011 42011 42011 42011
set_charge_power (number) Forcible charge power setpoint uint16 2 - W 42020 42020 42020 42020
set_discharge_power (number) Forcible discharge power setpoint uint16 2 - W 42021 42021 42021 42021
max_charge_power (number) Max allowed charge power uint16 2 - W 44002 44002 44002 44002
max_discharge_power (number) Max allowed discharge power uint16 2 - W 44003 44003 44003 44003
charging_cutoff_capacity (number) Charging cutoff (percentage) uint16 2 0.1 %     44000  
discharging_cutoff_capacity Discharging cutoff (percentage) uint16 2 0.1 %     44001  
reset_device (button) Reset device command uint16 2 - - 41000 41000 41000 41000
factory_reset (button) Factory reset command uint16 2 - - 41001 41001 41001 41001
schedule_1_days Schedule 1 days (bitmask) bit 2 - - 43100 43100 43100 43100
schedule_1_start Schedule 1 start (HHMM) uint 2 - min 43101 43101 43101 43101
schedule_1_end Schedule 1 end (HHMM) uint 2 - min 43102 43102 43102 43102
schedule_1_mode Schedule 1 mode (numeric) int16 2 - W 43103 43103 43103 43103
schedule_1_enabled Schedule 1 enabled (0/1) uint 2 - - 43104 43104 43104 43104
schedule_2_days Schedule 2 days (bitmask) bit 2 - - 43105 43105 43105 43105
schedule_2_start Schedule 2 start (HHMM) uint 2 - min 43106 43106 43106 43106
schedule_2_end Schedule 2 end (HHMM) uint 2 - min 43107 43107 43107 43107
schedule_2_mode Schedule 2 mode (numeric) int16 2 - W 43108 43108 43108 43108
schedule_2_enabled Schedule 2 enabled (0/1) uint 2 - - 43109 43109 43109 43109
schedule_3_days Schedule 3 days (bitmask) bit 2 - - 43110 43110 43110 43110
schedule_3_start Schedule 3 start (HHMM) uint 2 - min 43111 43111 43111 43111
schedule_3_end Schedule 3 end (HHMM) uint 2 - min 43112 43112 43112 43112
schedule_3_mode Schedule 3 mode (numeric) int16 2 - W 43113 43113 43113 43113
schedule_3_enabled Schedule 3 enabled (0/1) uint 2 - - 43114 43114 43114 43114
schedule_4_days Schedule 4 days (bitmask) bit 2 - - 43115 43115 43115 43115
schedule_4_start Schedule 4 start (HHMM) uint 2 - min 43116 43116 43116 43116
schedule_4_end Schedule 4 end (HHMM) uint 2 - min 43117 43117 43117 43117
schedule_4_mode Schedule 4 mode (numeric) int16 2 - W 43118 43118 43118 43118
schedule_4_enabled Schedule 4 enabled (0/1) uint 2 - - 43119 43119 43119 43119
schedule_5_days Schedule 5 days (bitmask) bit 2 - - 43120 43120 43120 43120
schedule_5_start Schedule 5 start (HHMM) uint 2 - min 43121 43121 43121 43121
schedule_5_end Schedule 5 end (HHMM) uint 2 - min 43122 43122 43122 43122
schedule_5_mode Schedule 5 mode (numeric) int16 2 - W 43123 43123 43123 43123
schedule_5_enabled Schedule 5 enabled (0/1) uint 2 - - 43124 43124 43124 43124
schedule_6_days Schedule 6 days (bitmask) bit 2 - - 43125 43125 43125 43125
schedule_6_start Schedule 6 start (HHMM) uint 2 - min 43126 43126 43126 43126
schedule_6_end Schedule 6 end (HHMM) uint 2 - min 43127 43127 43127 43127
schedule_6_mode Schedule 6 mode (numeric) int16 2 - W 43128 43128 43128 43128
schedule_6_enabled Schedule 6 enabled (0/1) uint 2 - - 43129 43129 43129 43129
round_trip_efficiency_total Round-trip efficiency (total charge/discharge energies) calculated - - %        
round_trip_efficiency_monthly Round-trip efficiency (monthly charge/discharge) calculated - - %        
conversion_efficiency Conversion efficiency (battery ↔ AC) calculated - - %        
stored_energy Stored battery energy (SOC × capacity) calculated - - kWh        
battery_cycle_count_calc Cycle count calculated from total discharge and capacity calculated - - -        

Notes:

  • Columns a, d, e_v12 and e_v3 correspond to the YAML files under custom_components/marstek_modbus/registers/.
  • Bytes shows the typical byte size for the key (each Modbus register = 2 bytes).
  • Blank cells mean that YAML does not define that key (or the value is calculated and has no direct Modbus register).
  • The rs485_control_mode switch (register 42000) uses write commands (command_on=21930, command_off=21947) to trigger RS485 control operations; use with caution.
  • For access to registers in the 42000–42999 range, the battery must be set to RS485 control mode.
  • Schedule Time format: start and end are entered as HHMM 24-hour integers (for example 0830 = 08:30). Use values within the valid range shown in the YAML for each device; ensure start is earlier than end for a single active period.
  • Schedule Day selection: the underlying schedule_*_days register uses a bitmask to represent multiple days, but the integration currently exposes it as a single-select option in Home Assistant. Due to this limitation you cannot select multiple days from the integration UI.
  • Energy Dashboard caveat (Venus A / Venus D with PV input): reported battery charge/discharge energy registers may include energy that flows to household loads via the inverter path, not only net battery-in/out energy. This can lead to misleading Home Assistant Energy Dashboard battery statistics. For accurate dashboard usage, prefer custom derived sensors (for example from power integration) and validate behavior on your firmware/device.
  • Schedule Mode values: schedule_*_mode accepts the following ranges:
    • -1 = Self consumption mode
    • Charge/discharge range is model-dependent.
    • Venus A (fw v148+): -100 to -1500 (charge), 100 to 1500 (discharge)
    • Venus D / Venus E: -100 to -2500 (charge), 100 to 2500 (discharge)

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