Battery drains very quickly from 15% to 5%



Have been using Manjaro 18 xfce for quite sometime. Distro is very good but the only concern for me has been the battery life. Before xfce, I used Manjaro KDE and there too I observed below average battery life.
As suggested by the title, battery immediately drops from 15% to 5% which seems very strange, because though battery drains quickly, this drop occurs sometimes in just a matter of minutes. I figure there must be something wrong with the battery life indicator or some other issue associated with Manjaro.
I have tlp installed. Any help appreciated.

  Host: Dell Kernel: 4.20.0-1-MANJARO x86_64 bits: 64 compiler: gcc v: 8.2.1 
  Desktop: Xfce 4.13.2git-UNKNOWN Distro: Manjaro Linux 
  Type: Laptop System: Dell product: Inspiron 3558 v: N/A serial: <filter> 
  Mobo: Dell model: 0G1TDD v: A00 serial: <filter> UEFI: Dell v: A16 
  date: 05/23/2018 
  ID-1: BAT0 charge: 18.6 Wh condition: 26.3/41.4 Wh (63%) 
  model: Panasonic DELL 78V9D66L status: Discharging 
  Topology: Dual Core model: Intel Core i5-5200U bits: 64 type: MT MCP 
  arch: Broadwell rev: 4 L2 cache: 3072 KiB 
  flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 17567 
  Speed: 798 MHz min/max: 500/2100 MHz Core speeds (MHz): 1: 798 2: 798 
  3: 798 4: 798 
  Device-1: Intel HD Graphics 5500 vendor: Dell driver: i915 v: kernel 
  bus ID: 00:02.0 
  Device-2: NVIDIA GK208BM [GeForce 920M] vendor: Dell driver: nouveau 
  v: kernel bus ID: 08:00.0 
  Display: x11 server: X.Org 1.20.3 driver: intel,nouveau 
  unloaded: modesetting resolution: 1366x768~60Hz 
  OpenGL: renderer: Mesa DRI Intel HD Graphics 5500 (Broadwell GT2) 
  v: 4.5 Mesa 18.3.1 direct render: Yes 
  Device-1: Intel Broadwell-U Audio vendor: Dell driver: snd_hda_intel 
  v: kernel bus ID: 00:03.0 
  Device-2: Intel Wildcat Point-LP High Definition Audio vendor: Dell 
  driver: snd_hda_intel v: kernel bus ID: 00:1b.0 
  Sound Server: ALSA v: k4.20.0-1-MANJARO 
  Device-1: Intel Wireless 3160 driver: iwlwifi v: kernel port: 5040 
  bus ID: 06:00.0 
  IF: wlp6s0 state: up mac: <filter> 
  Device-2: Realtek RTL810xE PCI Express Fast Ethernet vendor: Dell 
  driver: r8169 v: kernel port: 4000 bus ID: 07:00.0 
  IF: enp7s0 state: down mac: <filter> 
  Local Storage: total: 931.51 GiB used: 71.39 GiB (7.7%) 
  ID-1: /dev/sda vendor: Toshiba model: MQ01ABD100 size: 931.51 GiB 
  ID-1: / size: 209.84 GiB used: 71.36 GiB (34.0%) fs: ext4 dev: /dev/sda5 
  ID-2: swap-1 size: 5.25 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda6 
  System Temperatures: cpu: 40.0 C mobo: 46.0 C gpu: nouveau temp: 29 C 
  Fan Speeds (RPM): cpu: 0 
  Processes: 195 Uptime: 6h 27m Memory: 3.76 GiB used: 1.89 GiB (50.3%) 
  Init: systemd Compilers: gcc: 8.2.1 Shell: bash v: 4.4.23 inxi: 3.0.28


First thing to try: Completely drain computer, and charge it fully.


What @SlayerProof32 means is do a battery cycle.
This may show you a shorter battery life, but it will be more accurate.
Usually (if you dont have a machine with a special utility like thinkpads) this means letting your power drain all the way [power button does nothing] … leaving it a few hours … then charging it to full and leaving it plugged in a few hours … then drain and recharge and repeat atleast once.

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