I have just installed Leap 15.3 on a Fujitsi Lifebook A3510 (KDE). BIOS is version 1.10 dated 04/23/2021. I am not aware of a more recent one.
Unfortunately, I find a problem with power management.
Symptoms:
(1) The system tray icon "battery and brightness" does not show the battery status, but rather tells me that no battery is available (of course there is one).
(2) The KDE Info Center does not show any energy information.
(3) In System Settings->Power Management there is only a single page, not three tabs (On AC Power, On Battery, On Low Battery) as I see on other Leap 15.3 installations (other Fujitsu Lifebooks) that I have available here.

I have made a couple of test:
(1) checking kernel messages with dmesg gives
Code:
> sudo dmesg -T | grep -i battery
[So Sep 12 11:36:57 2021] battery: ACPI: Battery Slot [BAT1] (battery absent)
I get this message regardless of booting the notebook with the AC adapter connected to the power line or not. I have tried a recommendation found in the internet that suggests to boot the machine once with AC connected and the battery removed, then reinsert the battery and boot - but no change.

Other discussions seem to deal with outdated BIOS'es, except maybe the recommendation to boot with acpi=off, which makes booting to fail, acpi=ht, which allows boot, but does not bring upon a change for the problem or pci=noapi, which also prvents booting.

(2) the acpi -a command results in
Code:
> acpi -a
Adapter 0: off-line
if the machine is booted with AC not connected, and
Code:
> acpi -a
Adapter 0: on-line
if it is booted with AC connected. Once booted, this command's result does not change if the AC adapter is connected or removed while running the system.
So, it seems that the status of the AC adapter during boot is recognized but never updated later.

(3) acpi -V gives
Code:
> acpi -V
Adapter 0: on-line
Thermal 0: ok, 50.0 degrees C
Thermal 0: trip point 0 switches to mode critical at temperature 99.0 degrees C
Cooling 0: Processor 0 of 10
Cooling 1: Processor 0 of 10
Cooling 2: x86_pkg_temp no state information available
Cooling 3: Processor 0 of 10
Cooling 4: intel_powerclamp no state information available
Cooling 5: Processor 0 of 10
Cooling 6: iwlwifi_1 no state information available
again there is no response in the running system when inserting or removing the AC adapter.
This is even true if the acpid daemon is restarted. In no case, there appears a battery entry.

(4) upower:
Code:
> sudo upower -d
[sudo] Passwort für root:
Device: /org/freedesktop/UPower/devices/line_power_ACAD
  native-path:          ACAD
  power supply:         yes
  updated:              So 12 Sep 2021 11:09:43 CEST (46 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              no
    icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/DisplayDevice
  power supply:         no
  updated:              So 12 Sep 2021 11:09:43 CEST (46 seconds ago)
  has history:          no
  has statistics:       no
  unknown
    warning-level:       none
    icon-name:          'battery-missing-symbolic'

Daemon:
  daemon-version:  0.99.11
  on-battery:      no
  lid-is-closed:   no
  lid-is-present:  yes
  critical-action: Hibernate
Again, as for acpi, the status of the adapter at boot time is recognized (here online: no), but not changed later, not even if upower is restarted with systemctl. Note, there is no entry for a battery.

(5) dmidecode (I deleted some information to keep the message size within limits ...):
Code:
> sudo dmidecode
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 3.2.0 present.
Table at 0x3CFBD000.

Handle 0x0000, DMI type 0, 26 bytes
BIOS Information
    Vendor: FUJITSU CLIENT COMPUTING LIMITED
    Version: Version 1.10
    Release Date: 04/23/2021
    Address: 0xE0000
    Runtime Size: 128 kB
    ROM Size: 12288 kB
    Characteristics:
        PCI is supported
        BIOS is upgradeable
        BIOS shadowing is allowed
        Boot from CD is supported
        Selectable boot is supported
        ACPI is supported
        USB legacy is supported
        Function key-initiated network boot is supported
        Targeted content distribution is supported
        UEFI is supported
    BIOS Revision: 1.10
    Firmware Revision: 1.8

Handle 0x0001, DMI type 1, 27 bytes
System Information
    Manufacturer: FUJITSU CLIENT COMPUTING LIMITED
    Product Name: LIFEBOOK A3510
    Version:  
    Serial Number: EQAB157129
    UUID: 169230cd-e4d8-eb11-8b14-b0912bde2370
    Wake-up Type: Power Switch
    SKU Number: SK00
    Family: LIFEBOOK-FTS

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
    Manufacturer: FUJITSU CLIENT COMPUTING LIMITED
    Product Name: FJNBB6D
    Version: EQAB157129
    Serial Number: EQAB157129
    Asset Tag:  
    Features:
        Board is a hosting board
    Location In Chassis:  
    Chassis Handle: 0x0003
    Type: Motherboard
    Contained Object Handles: 0

Handle 0x0003, DMI type 3, 22 bytes
Chassis Information
    Manufacturer: FUJITSU CLIENT COMPUTING LIMITED
    Type: Notebook
    Lock: Not Present
    Version:  
    Serial Number: EQAB157129
    Asset Tag:  
    Boot-up State: Unknown
    Power Supply State: Unknown
    Thermal State: Unknown
    Security Status: Unknown
    OEM Information: 0x00000000
    Height: Unspecified
    Number Of Power Cords: Unspecified
    Contained Elements: 0
    SKU Number:  

Handle 0x0004, DMI type 4, 48 bytes
Processor Information
    Socket Designation: Onboard
    Type: Central Processor
    Family: Core i3
    Manufacturer: Intel(R) Corporation
    ID: E5 06 07 00 FF FB EB BF
    Signature: Type 0, Family 6, Model 126, Stepping 5
    Flags:
        FPU (Floating-point unit on-chip)
        VME (Virtual mode extension)
        DE (Debugging extension)
        PSE (Page size extension)
        TSC (Time stamp counter)
        MSR (Model specific registers)
        PAE (Physical address extension)
        MCE (Machine check exception)
        CX8 (CMPXCHG8 instruction supported)
        APIC (On-chip APIC hardware supported)
        SEP (Fast system call)
        MTRR (Memory type range registers)
        PGE (Page global enable)
        MCA (Machine check architecture)
        CMOV (Conditional move instruction supported)
        PAT (Page attribute table)
        PSE-36 (36-bit page size extension)
        CLFSH (CLFLUSH instruction supported)
        DS (Debug store)
        ACPI (ACPI supported)
        MMX (MMX technology supported)
        FXSR (FXSAVE and FXSTOR instructions supported)
        SSE (Streaming SIMD extensions)
        SSE2 (Streaming SIMD extensions 2)
        SS (Self-snoop)
        HTT (Multi-threading)
        TM (Thermal monitor supported)
        PBE (Pending break enabled)
    Version: Intel(R) Core(TM) i3-1005G1 CPU @ 1.20GHz
    Voltage: 0.6 V
    External Clock: 100 MHz
    Max Speed: 8300 MHz
    Current Speed: 1100 MHz
    Status: Populated, Enabled
    Upgrade: Other
    L1 Cache Handle: 0x0006
    L2 Cache Handle: 0x0007
    L3 Cache Handle: 0x0008
    Serial Number:  
    Asset Tag:  
    Part Number:  
    Core Count: 2
    Core Enabled: 2
    Thread Count: 4
    Characteristics:
        64-bit capable
        Multi-Core
        Hardware Thread
        Execute Protection
        Enhanced Virtualization
        Power/Performance Control

...

Handle 0x000D, DMI type 16, 23 bytes
Physical Memory Array
    Location: System Board Or Motherboard
    Use: System Memory
    Error Correction Type: None
    Maximum Capacity: 32 GB
    Error Information Handle: Not Provided
    Number Of Devices: 2

Handle 0x000E, DMI type 17, 84 bytes
Memory Device
    Array Handle: 0x000D
    Error Information Handle: Not Provided
    Total Width: 64 bits
    Data Width: 64 bits
    Size: 8192 MB
    Form Factor: SODIMM
    Set: None
    Locator: ChannelA-DIMM0
    Bank Locator: BANK 0
    Type: DDR4
    Type Detail: Synchronous
    Speed: 3200 MT/s
    Manufacturer: Micron
    Serial Number: 2E8B23AA
    Asset Tag: 9876543210
    Part Number: 4ATF1G64HZ-3G2E1    
    Rank: 1
    Configured Memory Speed: 3200 MT/s
    Minimum Voltage: 1.35 V
    Maximum Voltage: 1.35 V
    Configured Voltage: 1.2 V
    Memory Technology: DRAM
    Memory Operating Mode Capability: Volatile memory
    Firmware Version: Not Specified
    Module Manufacturer ID: Bank 1, Hex 0x2C
    Module Product ID: Unknown
    Memory Subsystem Controller Manufacturer ID: Unknown
    Memory Subsystem Controller Product ID: Unknown
    Non-Volatile Size: None
    Volatile Size: 8 GB
    Cache Size: None
    Logical Size: None

Handle 0x000F, DMI type 17, 84 bytes
Memory Device
    Array Handle: 0x000D
    Error Information Handle: Not Provided
    Total Width: Unknown
    Data Width: Unknown
    Size: No Module Installed
    Form Factor: Unknown
    Set: None
    Locator: ChannelB-DIMM0
    Bank Locator: BANK 2
    Type: Unknown
    Type Detail: None

Handle 0x0010, DMI type 19, 31 bytes
Memory Array Mapped Address
    Starting Address: 0x00000000000
    Ending Address: 0x001FFFFFFFF
    Range Size: 8 GB
    Physical Array Handle: 0x000D
    Partition Width: 1

Handle 0x0011, DMI type 20, 35 bytes
Memory Device Mapped Address
    Starting Address: 0x00000000000
    Ending Address: 0x001FFFFFFFF
    Range Size: 8 GB
    Physical Device Handle: 0x000E
    Memory Array Mapped Address Handle: 0x0010
    Partition Row Position: Unknown
    Interleave Position: 1
    Interleaved Data Depth: 1

Handle 0x0012, DMI type 21, 7 bytes
Built-in Pointing Device
    Type: Other
    Interface: PS/2
    Buttons: 2

Handle 0x0013, DMI type 22, 26 bytes
Portable Battery
    Location: Internal Battery
    Manufacturer: FUJITSU
    Manufacture Date:  
    Serial Number: 02A-Z210522000167Z
    Name: CP753347-01
    Chemistry: Lithium Ion
    Design Capacity: 45032 mWh
    Design Voltage: 10800 mV
    SBDS Version:  
    Maximum Error: Unknown
    OEM-specific Information: 0xFFFFFFFF

Handle 0x0014, DMI type 24, 5 bytes
Hardware Security
    Power-On Password Status: Disabled
    Keyboard Password Status: Not Implemented
    Administrator Password Status: Disabled
    Front Panel Reset Status: Not Implemented

Handle 0x0015, DMI type 32, 11 bytes
System Boot Information
    Status: No errors detected

Handle 0x0016, DMI type 43, 31 bytes
TPM Device
    Vendor ID: INTC
    Specification Version: 2.0
    Firmware Revision: 500.5
    Description: TPM Device
    Characteristics:
        TPM Device characteristics not supported
    OEM-specific Information: 0x00000000

Handle 0x0017, DMI type 126, 89 bytes
Inactive

Handle 0x0018, DMI type 126, 26 bytes
Inactive

Handle 0x0019, DMI type 131, 64 bytes
OEM-specific Type
    Header and Data:
        83 40 19 00 31 00 00 00 00 00 00 00 00 00 00 00
        F8 00 82 34 00 00 00 00 01 00 00 00 00 00 0D 00
        3A 06 28 00 00 00 00 00 FE 00 FF FF 00 00 00 00
        00 FF 00 00 26 00 00 00 76 50 72 6F 00 00 00 00

Handle 0x001A, DMI type 143, 16 bytes
OEM-specific Type
    Header and Data:
        8F 10 1A 00 00 5F 46 4A 5F 4F 45 4D 5F 12 00 00

Handle 0x001B, DMI type 143, 8 bytes
OEM-specific Type
    Header and Data:
        8F 08 1B 00 01 03 00 00

Handle 0x001C, DMI type 143, 11 bytes
OEM-specific Type
    Header and Data:
        8F 0B 1C 00 02 00 01 38 04 80 07

Handle 0x001D, DMI type 143, 11 bytes
OEM-specific Type
    Header and Data:
        8F 0B 1D 00 02 06 01 09 E5 00 07

Handle 0x001E, DMI type 143, 7 bytes
OEM-specific Type
    Header and Data:
        8F 07 1E 00 02 01 01

Handle 0x001F, DMI type 143, 7 bytes
OEM-specific Type
    Header and Data:
        8F 07 1F 00 02 02 01

Handle 0x0020, DMI type 143, 11 bytes
OEM-specific Type
    Header and Data:
        8F 0B 20 00 02 07 01 03 01 00 00

Handle 0x0021, DMI type 143, 16 bytes
OEM-specific Type
    Header and Data:
        8F 10 21 00 03 02 01 02 01 00 00 00 00 00 00 00

Handle 0x0022, DMI type 143, 32 bytes
OEM-specific Type
    Header and Data:
        8F 20 22 00 03 06 01 02 0F 00 04 00 EC AF 00 00
        D0 AD 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Handle 0x0023, DMI type 143, 16 bytes
OEM-specific Type
    Header and Data:
        8F 10 23 00 03 0B 01 01 00 00 00 00 00 00 00 00

Handle 0x0024, DMI type 143, 16 bytes
OEM-specific Type
    Header and Data:
        8F 10 24 00 03 0D 01 01 01 00 02 03 00 00 00 00
    Strings:
        K5:SCBTE
        K7:FBE
        K7:FBD

Handle 0x0025, DMI type 176, 48 bytes
OEM-specific Type
    Header and Data:
        B0 30 25 00 10 00 00 00 00 00 FF FF FF FF FF FF
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        03 00 03 00 49 00 00 00 07 00 00 00 00 00 00 00

Handle 0x0026, DMI type 188, 8 bytes
OEM-specific Type
    Header and Data:
        BC 08 26 00 39 38 31 24

Handle 0x0027, DMI type 219, 106 bytes
OEM-specific Type
    Header and Data:
        DB 6A 27 00 01 04 01 45 02 00 90 06 01 10 82 20
        00 00 00 00 40 00 00 03 1F 00 00 C9 0A 44 44 02
        FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
        FF FF FF FF FF FF FF FF 03 00 00 00 80 00 00 00
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00
        00 00 00 00 00 00 00 00 00 00
    Strings:
        MEI1
        MEI2
        MEI3
        MEI4

Handle 0x0028, DMI type 222, 14 bytes
OEM-specific Type
    Header and Data:
        DE 0E 28 00 01 99 00 03 10 01 20 02 30 03
    Strings:
        Memory Init Complete
        End of DXE Phase
        BIOS Boot Complete

Handle 0x0029, DMI type 248, 12 bytes
OEM-specific Type
    Header and Data:
        F8 0C 29 00 01 4C E0 00 92 03 00 00

Handle 0xFEFF, DMI type 127, 4 bytes
End Of Table
Here, we find an entry for the "Portable Battery" (Handle 0x0013) with some details. This is identical again for situations where the machine was booted with or without the adapter connected. The only difference is found in the "Header and Data" block of Handle 0x0027.

Has anyone an idea how to resolve this and make the battery information available to the Leap 15.3 system?
If needed, I can give more information.
Thank you.