diff --git a/lua/settings.lua b/lua/settings.lua
index 49a826af..79572ee9 100644
--- a/lua/settings.lua
+++ b/lua/settings.lua
@@ -485,6 +485,59 @@ local DatabaseSettings = SettingsScreen:new {
   end
 }
 
+local PowerSettings = SettingsScreen:new {
+  title = "Power",
+  createUi = function(self)
+    SettingsScreen.createUi(self)
+    local power = require("power")
+
+    local charge_pct = widgets.Row(self.content, "Charge").right
+    local charge_volts = widgets.Row(self.content, "Voltage").right
+    local charge_state = widgets.Row(self.content, "Status").right
+
+    self.bindings = self.bindings + {
+      power.battery_pct:bind(function(pct)
+        charge_pct:set { text = string.format("%d%%", pct) }
+      end),
+      power.battery_millivolts:bind(function(mv)
+        charge_volts:set { text = string.format("%.2fV", mv / 1000) }
+      end),
+      power.charge_state:bind(function(state)
+        charge_state:set { text = state }
+      end),
+    }
+
+    local fast_charge_container = self.content:Object {
+      flex = {
+        flex_direction = "row",
+        justify_content = "flex-start",
+        align_items = "center",
+        align_content = "flex-start",
+      },
+      w = lvgl.PCT(100),
+      h = lvgl.SIZE_CONTENT,
+      pad_bottom = 4,
+    }
+    fast_charge_container:add_style(styles.list_item)
+    fast_charge_container:Label { text = "Fast Charging", flex_grow = 1 }
+    local fast_charge_sw = fast_charge_container:Switch {}
+
+    fast_charge_sw:onevent(lvgl.EVENT.VALUE_CHANGED, function()
+      power.fast_charge:set(fast_charge_sw:enabled())
+    end)
+
+    self.bindings = self.bindings + {
+      power.fast_charge:bind(function(en)
+        if en then
+          fast_charge_sw:add_state(lvgl.STATE.CHECKED)
+        else
+          fast_charge_sw:clear_state(lvgl.STATE.CHECKED)
+        end
+      end),
+    }
+  end
+}
+
 local SamdConfirmation = SettingsScreen:new {
   title = "Are you sure?",
   createUi = function(self)
@@ -696,6 +749,9 @@ return widgets.MenuScreen:new {
 
     section("System")
     submenu("Database", DatabaseSettings)
+    submenu("Power", PowerSettings)
+
+    section("About")
     submenu("Firmware", FirmwareSettings)
     submenu("Licenses", LicensesScreen)
     submenu("Regulatory", RegulatoryScreen)
diff --git a/lua/widgets.lua b/lua/widgets.lua
index 78d53a57..f830390f 100644
--- a/lua/widgets.lua
+++ b/lua/widgets.lua
@@ -58,7 +58,7 @@ widgets.MenuScreen = screen:new {
   end
 }
 
-function widgets.Row(parent, left, right)
+function widgets.Row(parent, left_text, right_text)
   local container = parent:Object {
     flex = {
       flex_direction = "row",
@@ -70,12 +70,16 @@ function widgets.Row(parent, left, right)
     h = lvgl.SIZE_CONTENT
   }
   container:add_style(styles.list_item)
-  container:Label {
-    text = left,
-    flex_grow = 1
+  local left = container:Label {
+    text = left_text,
+    flex_grow = 1,
+  }
+  local right = container:Label {
+    text = right_text or "",
   }
-  container:Label {
-    text = right
+  return {
+    left = left,
+    right = right,
   }
 end
 
diff --git a/luals-stubs/power.lua b/luals-stubs/power.lua
index ac7f15bb..d28cd196 100644
--- a/luals-stubs/power.lua
+++ b/luals-stubs/power.lua
@@ -6,6 +6,8 @@
 --- @field battery_pct Property The battery's current charge, as a percentage of the maximum charge.
 --- @field battery_millivolts Property The battery's current voltage, in millivolts.
 --- @field plugged_in Property Whether or not the device is currently receiving external power.
+--- @field fast_charge Property Whether or not fast charging is enabled. Fast charging can fully recharge the battery up to two times faster than regular charging, but will have a small negative impact on the lifetime of the battery.
+--- @field charge_state Property a string property describing the current charging state. May be one of "no_battery", "critical", "discharging", "charge_regular", "charge_fast", "full_charge", "fault", or "unknown".
 local power = {}
 
 return power
diff --git a/src/drivers/include/drivers/nvs.hpp b/src/drivers/include/drivers/nvs.hpp
index 8eb28cc9..e298ffc3 100644
--- a/src/drivers/include/drivers/nvs.hpp
+++ b/src/drivers/include/drivers/nvs.hpp
@@ -90,6 +90,9 @@ class NvsStorage {
   auto LraCalibration() -> std::optional<LraData>;
   auto LraCalibration(const LraData&) -> void;
 
+  auto FastCharge() -> bool;
+  auto FastCharge(bool) -> void;
+
   auto PreferredBluetoothDevice() -> std::optional<bluetooth::MacAndName>;
   auto PreferredBluetoothDevice(std::optional<bluetooth::MacAndName>) -> void;
 
@@ -150,6 +153,7 @@ class NvsStorage {
   Setting<uint16_t> display_rows_;
   Setting<uint8_t> haptic_motor_type_;
   Setting<LraData> lra_calibration_;
+  Setting<uint8_t> fast_charge_;
 
   Setting<uint8_t> brightness_;
   Setting<uint8_t> sensitivity_;
diff --git a/src/drivers/include/drivers/samd.hpp b/src/drivers/include/drivers/samd.hpp
index 897e78d6..ff479225 100644
--- a/src/drivers/include/drivers/samd.hpp
+++ b/src/drivers/include/drivers/samd.hpp
@@ -10,6 +10,7 @@
 #include <optional>
 #include <string>
 
+#include "drivers/nvs.hpp"
 #include "freertos/FreeRTOS.h"
 #include "freertos/semphr.h"
 
@@ -17,9 +18,7 @@ namespace drivers {
 
 class Samd {
  public:
-  static auto Create() -> Samd* { return new Samd(); }
-
-  Samd();
+  Samd(NvsStorage& nvs);
   ~Samd();
 
   auto Version() -> std::string;
@@ -37,8 +36,14 @@ class Samd {
     kChargingFast,
     // The battery is full charged, and we are still plugged in.
     kFullCharge,
+    // Charging failed.
+    kFault,
+    // The battery status returned isn't a known enum value.
+    kUnknown,
   };
 
+  static auto chargeStatusToString(ChargeStatus) -> std::string;
+
   auto GetChargeStatus() -> std::optional<ChargeStatus>;
   auto UpdateChargeStatus() -> void;
 
@@ -68,6 +73,8 @@ class Samd {
   Samd& operator=(const Samd&) = delete;
 
  private:
+  NvsStorage& nvs_;
+
   uint8_t version_;
   std::optional<ChargeStatus> charge_status_;
   UsbStatus usb_status_;
diff --git a/src/drivers/nvs.cpp b/src/drivers/nvs.cpp
index e3c4aa06..6fac8c61 100644
--- a/src/drivers/nvs.cpp
+++ b/src/drivers/nvs.cpp
@@ -40,6 +40,7 @@ static constexpr char kKeyDisplayRows[] = "disprows";
 static constexpr char kKeyHapticMotorType[] = "hapticmtype";
 static constexpr char kKeyLraCalibration[] = "lra_cali";
 static constexpr char kKeyDbAutoIndex[] = "dbautoindex";
+static constexpr char kKeyFastCharge[] = "fastchg";
 
 static auto nvs_get_string(nvs_handle_t nvs, const char* key)
     -> std::optional<std::string> {
@@ -239,6 +240,7 @@ NvsStorage::NvsStorage(nvs_handle_t handle)
       display_rows_(kKeyDisplayRows),
       haptic_motor_type_(kKeyHapticMotorType),
       lra_calibration_(kKeyLraCalibration),
+      fast_charge_(kKeyFastCharge),
       brightness_(kKeyBrightness),
       sensitivity_(kKeyScrollSensitivity),
       amp_max_vol_(kKeyAmpMaxVolume),
@@ -444,6 +446,16 @@ auto NvsStorage::OutputMode(Output out) -> void {
   nvs_commit(handle_);
 }
 
+auto NvsStorage::FastCharge() -> bool {
+  std::lock_guard<std::mutex> lock{mutex_};
+  return fast_charge_.get().value_or(true);
+}
+
+auto NvsStorage::FastCharge(bool en) -> void {
+  std::lock_guard<std::mutex> lock{mutex_};
+  fast_charge_.set(en);
+}
+
 auto NvsStorage::ScreenBrightness() -> uint_fast8_t {
   std::lock_guard<std::mutex> lock{mutex_};
   return std::clamp<uint8_t>(brightness_.get().value_or(50), 0, 100);
diff --git a/src/drivers/samd.cpp b/src/drivers/samd.cpp
index e4aa73ad..c2308760 100644
--- a/src/drivers/samd.cpp
+++ b/src/drivers/samd.cpp
@@ -5,11 +5,13 @@
  */
 
 #include "drivers/samd.hpp"
+#include <stdint.h>
 
 #include <cstdint>
 #include <optional>
 #include <string>
 
+#include "drivers/nvs.hpp"
 #include "esp_err.h"
 #include "esp_log.h"
 #include "hal/gpio_types.h"
@@ -32,7 +34,29 @@ namespace drivers {
 
 static constexpr gpio_num_t kIntPin = GPIO_NUM_35;
 
-Samd::Samd() {
+auto Samd::chargeStatusToString(ChargeStatus status) -> std::string {
+  switch (status) {
+    case ChargeStatus::kNoBattery:
+      return "no_battery";
+    case ChargeStatus::kBatteryCritical:
+      return "critical";
+    case ChargeStatus::kDischarging:
+      return "discharging";
+    case ChargeStatus::kChargingRegular:
+      return "charge_regular";
+    case ChargeStatus::kChargingFast:
+      return "charge_fast";
+    case ChargeStatus::kFullCharge:
+      return "full_charge";
+    case ChargeStatus::kFault:
+      return "fault";
+    case ChargeStatus::kUnknown:
+    default:
+      return "unknown";
+  }
+}
+
+Samd::Samd(NvsStorage& nvs) : nvs_(nvs) {
   gpio_set_direction(kIntPin, GPIO_MODE_INPUT);
 
   // Being able to interface with the SAMD properly is critical. To ensure we
@@ -51,7 +75,7 @@ Samd::Samd() {
 
   UpdateChargeStatus();
   UpdateUsbStatus();
-  SetFastChargeEnabled(true);
+  SetFastChargeEnabled(nvs.FastCharge());
 }
 Samd::~Samd() {}
 
@@ -78,16 +102,38 @@ auto Samd::UpdateChargeStatus() -> void {
     return;
   }
 
-  // FIXME: Ideally we should be using the three 'charge status' bits to work
-  // out whether we're actually charging, or if we've got a full charge,
-  // critically low charge, etc.
+  // Lower two bits are the usb power status, next three are the BMS status.
+  // See 'gpio.c' in the SAMD21 firmware for how these bits get packed.
+  uint8_t charge_state = (raw_res & 0b11100) >> 2;
   uint8_t usb_state = raw_res & 0b11;
-  if (usb_state == 0) {
-    charge_status_ = ChargeStatus::kDischarging;
-  } else if (usb_state == 1) {
-    charge_status_ = ChargeStatus::kChargingRegular;
-  } else {
-    charge_status_ = ChargeStatus::kChargingFast;
+  switch (charge_state) {
+    case 0b000:
+      charge_status_ = ChargeStatus::kNoBattery;
+      break;
+    case 0b001:
+      // BMS says we're charging; work out how fast we're charging.
+      if (usb_state >= 0b10 && nvs_.FastCharge()) {
+        charge_status_ = ChargeStatus::kChargingFast;
+      } else {
+        charge_status_ = ChargeStatus::kChargingRegular;
+      }
+      break;
+    case 0b010:
+      charge_status_ = ChargeStatus::kFullCharge;
+      break;
+    case 0b011:
+      charge_status_ = ChargeStatus::kFault;
+      break;
+    case 0b100:
+      charge_status_ = ChargeStatus::kBatteryCritical;
+      break;
+    case 0b101:
+      charge_status_ = ChargeStatus::kDischarging;
+      break;
+    case 0b110:
+    case 0b111:
+      charge_status_ = ChargeStatus::kUnknown;
+      break;
   }
 }
 
@@ -127,9 +173,15 @@ auto Samd::ResetToFlashSamd() -> void {
 }
 
 auto Samd::SetFastChargeEnabled(bool en) -> void {
+  // Always update NVS, so that the setting is right after the SAMD firmware is
+  // updated.
+  nvs_.FastCharge(en);
+
   if (version_ < 4) {
     return;
   }
+  ESP_LOGI(kTag, "set fast charge %u", en);
+
   I2CTransaction transaction;
   transaction.start()
       .write_addr(kAddress, I2C_MASTER_WRITE)
diff --git a/src/tangara/app_console/app_console.cpp b/src/tangara/app_console/app_console.cpp
index 11862143..21dec56a 100644
--- a/src/tangara/app_console/app_console.cpp
+++ b/src/tangara/app_console/app_console.cpp
@@ -465,26 +465,7 @@ int CmdSamd(int argc, char** argv) {
   } else if (cmd == "charge") {
     auto res = samd.GetChargeStatus();
     if (res) {
-      switch (res.value()) {
-        case drivers::Samd::ChargeStatus::kNoBattery:
-          std::cout << "kNoBattery" << std::endl;
-          break;
-        case drivers::Samd::ChargeStatus::kBatteryCritical:
-          std::cout << "kBatteryCritical" << std::endl;
-          break;
-        case drivers::Samd::ChargeStatus::kDischarging:
-          std::cout << "kDischarging" << std::endl;
-          break;
-        case drivers::Samd::ChargeStatus::kChargingRegular:
-          std::cout << "kChargingRegular" << std::endl;
-          break;
-        case drivers::Samd::ChargeStatus::kChargingFast:
-          std::cout << "kChargingFast" << std::endl;
-          break;
-        case drivers::Samd::ChargeStatus::kFullCharge:
-          std::cout << "kFullCharge" << std::endl;
-          break;
-      }
+      std::cout << drivers::Samd::chargeStatusToString(*res) << std::endl;
     } else {
       std::cout << "unknown" << std::endl;
     }
diff --git a/src/tangara/battery/battery.cpp b/src/tangara/battery/battery.cpp
index 3cfdb20c..9bde86a8 100644
--- a/src/tangara/battery/battery.cpp
+++ b/src/tangara/battery/battery.cpp
@@ -93,6 +93,8 @@ auto Battery::Update() -> void {
       .percent = percent,
       .millivolts = mV,
       .is_charging = is_charging,
+      .raw_status =
+          charge_state.value_or(drivers::Samd::ChargeStatus::kUnknown),
   };
   EmitEvent();
 }
diff --git a/src/tangara/battery/battery.hpp b/src/tangara/battery/battery.hpp
index 80b0f2d2..c4f631e0 100644
--- a/src/tangara/battery/battery.hpp
+++ b/src/tangara/battery/battery.hpp
@@ -27,6 +27,7 @@ class Battery {
     uint_fast8_t percent;
     uint32_t millivolts;
     bool is_charging;
+    drivers::Samd::ChargeStatus raw_status;
 
     bool operator==(const BatteryState& other) const {
       return percent == other.percent && is_charging == other.is_charging;
diff --git a/src/tangara/system_fsm/booting.cpp b/src/tangara/system_fsm/booting.cpp
index a3fed9fa..1f99e3ab 100644
--- a/src/tangara/system_fsm/booting.cpp
+++ b/src/tangara/system_fsm/booting.cpp
@@ -87,7 +87,7 @@ auto Booting::entry() -> void {
 
   ESP_LOGI(kTag, "installing remaining drivers");
   drivers::spiffs_mount();
-  sServices->samd(std::unique_ptr<drivers::Samd>(drivers::Samd::Create()));
+  sServices->samd(std::make_unique<drivers::Samd>(sServices->nvs()));
   sServices->touchwheel(
       std::unique_ptr<drivers::TouchWheel>{drivers::TouchWheel::Create()});
   sServices->haptics(std::make_unique<drivers::Haptics>(sServices->nvs()));
@@ -96,8 +96,8 @@ auto Booting::entry() -> void {
   sServices->battery(std::make_unique<battery::Battery>(
       sServices->samd(), std::unique_ptr<drivers::AdcBattery>(adc)));
 
-  sServices->track_queue(
-      std::make_unique<audio::TrackQueue>(sServices->bg_worker(), sServices->database()));
+  sServices->track_queue(std::make_unique<audio::TrackQueue>(
+      sServices->bg_worker(), sServices->database()));
   sServices->tag_parser(std::make_unique<database::TagParserImpl>());
   sServices->collator(locale::CreateCollator());
   sServices->tts(std::make_unique<tts::Provider>());
diff --git a/src/tangara/ui/ui_fsm.cpp b/src/tangara/ui/ui_fsm.cpp
index cd39dc9c..38e9b8e1 100644
--- a/src/tangara/ui/ui_fsm.cpp
+++ b/src/tangara/ui/ui_fsm.cpp
@@ -101,6 +101,15 @@ static auto lvgl_delay_cb(uint32_t ms) -> void {
 lua::Property UiState::sBatteryPct{0};
 lua::Property UiState::sBatteryMv{0};
 lua::Property UiState::sBatteryCharging{false};
+lua::Property UiState::sPowerChargeState{"unknown"};
+lua::Property UiState::sPowerFastChargeEnabled{
+    false, [](const lua::LuaValue& val) {
+      if (!std::holds_alternative<bool>(val)) {
+        return false;
+      }
+      sServices->samd().SetFastChargeEnabled(std::get<bool>(val));
+      return true;
+    }};
 
 lua::Property UiState::sBluetoothEnabled{
     false, [](const lua::LuaValue& val) {
@@ -406,6 +415,13 @@ void UiState::react(const system_fsm::BatteryStateChanged& ev) {
   sBatteryPct.setDirect(static_cast<int>(ev.new_state.percent));
   sBatteryMv.setDirect(static_cast<int>(ev.new_state.millivolts));
   sBatteryCharging.setDirect(ev.new_state.is_charging);
+  sPowerChargeState.setDirect(
+      drivers::Samd::chargeStatusToString(ev.new_state.raw_status));
+
+  // FIXME: Avoid calling these event handlers before boot.
+  if (sServices) {
+    sPowerFastChargeEnabled.setDirect(sServices->nvs().FastCharge());
+  }
 }
 
 void UiState::react(const audio::QueueUpdate&) {
@@ -414,7 +430,8 @@ void UiState::react(const audio::QueueUpdate&) {
   sQueueSize.setDirect(static_cast<int>(queue_size));
 
   int current_pos = queue.currentPosition();
-  // If there is nothing in the queue, the position should be 0, otherwise, add one because lua
+  // If there is nothing in the queue, the position should be 0, otherwise, add
+  // one because lua
   if (queue_size > 0) {
     current_pos++;
   }
@@ -564,11 +581,14 @@ void Lua::entry() {
 
     auto& registry = lua::Registry::instance(*sServices);
     sLua = registry.uiThread();
-    registry.AddPropertyModule("power", {
-                                            {"battery_pct", &sBatteryPct},
-                                            {"battery_millivolts", &sBatteryMv},
-                                            {"plugged_in", &sBatteryCharging},
-                                        });
+    registry.AddPropertyModule("power",
+                               {
+                                   {"battery_pct", &sBatteryPct},
+                                   {"battery_millivolts", &sBatteryMv},
+                                   {"plugged_in", &sBatteryCharging},
+                                   {"charge_state", &sPowerChargeState},
+                                   {"fast_charge", &sPowerFastChargeEnabled},
+                               });
     registry.AddPropertyModule(
         "bluetooth", {
                          {"enabled", &sBluetoothEnabled},
@@ -663,6 +683,8 @@ void Lua::entry() {
     }
     sBluetoothKnownDevices.setDirect(bt.knownDevices());
 
+    sPowerFastChargeEnabled.setDirect(sServices->nvs().FastCharge());
+
     if (sServices->sd() == drivers::SdState::kMounted) {
       sLua->RunScript("/sdcard/config.lua");
     }
diff --git a/src/tangara/ui/ui_fsm.hpp b/src/tangara/ui/ui_fsm.hpp
index cef9a13a..41f0db3a 100644
--- a/src/tangara/ui/ui_fsm.hpp
+++ b/src/tangara/ui/ui_fsm.hpp
@@ -101,6 +101,8 @@ class UiState : public tinyfsm::Fsm<UiState> {
   static lua::Property sBatteryPct;
   static lua::Property sBatteryMv;
   static lua::Property sBatteryCharging;
+  static lua::Property sPowerChargeState;
+  static lua::Property sPowerFastChargeEnabled;
 
   static lua::Property sBluetoothEnabled;
   static lua::Property sBluetoothConnecting;