I have two potent batteries in my laptop

The power settings presents it like this
Battery 1: 100%, Battery 2: 100% Total Battery 71%.

How should I understand these percentages? I didn't crop just to show the gs app shows the same percentage.

upower reports the following on Battery 1

  native-path:          BAT0

  vendor:               SANYO

  model:                00HW022

  serial:               2206

  power supply:         yes

  updated:              sat 22 jan 2022 12:44:14 (34 seconds ago)

  has history:          yes

  has statistics:       yes

  battery

    present:             yes

    rechargeable:        yes

    state:               fully-charged

    warning-level:       none

    energy:              18,89 Wh

    energy-empty:        0 Wh

    energy-full:         25,83 Wh

    energy-full-design:  23,51 Wh

    energy-rate:         2,53 W

    voltage:             12,721 V

    percentage:          99%

    capacity:            100%

    technology:          lithium-polymer

    icon-name:          'battery-full-charged-symbolic'

  History (charge):

    1642851854  99,000  fully-charged

On battery 2

  native-path:          BAT1

  vendor:               SMP

  model:                01AV406

  serial:               1111

  power supply:         yes

  updated:              lör 22 jan 2022 12:50:14 (12 seconds ago)

  has history:          yes

  has statistics:       yes

  battery

    present:             yes

    rechargeable:        yes

    state:               fully-charged

    warning-level:       none

    energy:              14,76 Wh

    energy-empty:        0 Wh

    energy-full:         21,18 Wh

    energy-full-design:  26,06 Wh

    energy-rate:         1,092 W

    voltage:             12,637 V

    percentage:          100%

    capacity:            68,8795%

    technology:          lithium-polymer

    icon-name:          'battery-full-charged-symbolic'

It does seem to be related to battery wear, energy/energy-full is 73% on BAT0, 70% on BAT1.