Code Playground

@keyframes load {
  0% {
    top: 4.5rem;
  }
  70% {
    top: 1.125rem;
  }
  90% {
    top: 0;
  }
  95% {
    top: 0;
  }
  100% {
    top: 4.5rem;
  }
}
@keyframes liquid-1 {
  0% {
    height: 0;
    opacity: 0;
    top: -0.5rem;
  }
  22% {
    height: 0.28125rem;
    top: 0.375rem;
    opacity: 1;
  }
  25% {
    top: -0.25rem;
  }
  35% {
    height: 1.125rem;
    top: -0.5rem;
  }
  55% {
    height: 0.28125rem;
    top: -0.125rem;
  }
  60% {
    height: 0.61875rem;
    opacity: 1;
    top: -0.275rem;
  }
  96% {
    height: 0.84375rem;
    opacity: 0;
    top: 0.5rem;
  }
  100% {
    height: 0;
    opacity: 0;
  }
}
@keyframes liquid-2 {
  0% {
    height: 0;
    opacity: 0;
    top: -0.5rem;
  }
  17.5% {
    height: 0.28125rem;
    top: 0.2rem;
    opacity: 1;
  }
  20% {
    top: -0.25rem;
  }
  25% {
    height: 1.40625rem;
    top: -0.625rem;
  }
  45% {
    height: 0.28125rem;
    top: -0.125rem;
  }
  60% {
    height: 1.40625rem;
    opacity: 1;
    top: -0.5rem;
  }
  96% {
    height: 0.84375rem;
    opacity: 0;
    top: 0.5rem;
  }
  100% {
    height: 0;
    opacity: 0;
  }
}
.battery {
  display: inline-block;
  position: relative;
  width: 2.25rem;
  height: 4.5rem;
  box-shadow: 0 0 0 0.2rem #425C77;
  background: white;
  border-radius: 0.09rem;
}
.battery:before {
  content: "";
  position: absolute;
  left: 0.5625rem;
  right: 0.5625rem;
  top: -0.3375rem;
  height: 0.3375rem;
  width: 1.125rem;
  background: #425C77;
  border-radius: 0.18rem;
}
.battery:after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  border-right: 2.25rem solid transparent;
  border-bottom: 4.05rem solid rgba(255, 255, 255, 0.325);
}

.liquid {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 2.25rem;
  background: #71FB85;
  animation: load 2.25s infinite;
}
.liquid:after, .liquid:before {
  content: "";
  position: absolute;
  top: -0.5rem;
  height: 1.125rem;
  width: 1.4625rem;
  background: #71FB85;
  border-radius: 50%;
  opacity: 0;
}
.liquid:after {
  right: 0;
  animation: liquid-1 2.25s infinite;
}
.liquid:before {
  left: 0;
  animation: liquid-2 2.25s infinite;
}

body {
  padding-top: 30vh;
  background: #efefef;
  text-align: center;
}

@keyframes power {
  0% {
    color: #bcbcbc;
  }
  75% {
    color: #bcbcbc;
    text-shadow: none;
  }
  90% {
    color: #58fa70;
    text-shadow: 0 0 0.8em #71FB85;
  }
  100% {
    color: #bcbcbc;
    text-shadow: none;
  }
}
h5 {
  font-family: Lato, sans-serif;
  font-weight: 300;
  letter-spacing: 0.025rem;
  text-transform: uppercase;
  color: #bcbcbc;
  animation: power 2.25s infinite;
}

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