diff --git a/src/action/index.ts b/src/action/index.ts
index 3c9b18a..3a0e707 100644
--- a/src/action/index.ts
+++ b/src/action/index.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 Jonas Lochmann
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -51,6 +51,7 @@ export { SetUserTimezoneAction } from './setusertimezone'
 export { SignOutAtDeviceAction } from './signoutatdevice'
 export { TriedDisablingDeviceAdminAction } from './trieddisablingdeviceadmin'
 export { UpdateAppActivitiesAction } from './updateappactivities'
+export { UpdateCategoryBatteryLimitAction } from './updatecategorybatterylimit'
 export { UpdateCategoryBlockAllNotificationsAction } from './updatecategoryblockallnotifications'
 export { UpdateCategoryBlockedTimesAction } from './updatecategoryblockedtimes'
 export { UpdateCategoryTemporarilyBlockedAction } from './updatecategorytemporarilyblocked'
diff --git a/src/action/serialization/parentaction.ts b/src/action/serialization/parentaction.ts
index 7556b80..dbd9f53 100644
--- a/src/action/serialization/parentaction.ts
+++ b/src/action/serialization/parentaction.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 Jonas Lochmann
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -42,6 +42,7 @@ import { SerializedSetRelaxPrimaryDeviceAction, SetRelaxPrimaryDeviceAction } fr
 import { SerializedSetSendDeviceConnected, SetSendDeviceConnected } from '../setsenddeviceconnected'
 import { SerializedSetUserDisableLimitsUntilAction, SetUserDisableLimitsUntilAction } from '../setuserdisablelimitsuntil'
 import { SerializedSetUserTimezoneAction, SetUserTimezoneAction } from '../setusertimezone'
+import { SerializedUpdateCategoryBatteryLimitAction, UpdateCategoryBatteryLimitAction } from '../updatecategorybatterylimit'
 import { SerializedUpdateCategoryBlockAllNotificationsAction, UpdateCategoryBlockAllNotificationsAction } from '../updatecategoryblockallnotifications'
 import { SerializedUpdateCategoryBlockedTimesAction, UpdateCategoryBlockedTimesAction } from '../updatecategoryblockedtimes'
 import { SerializedUpdateCategoryTemporarilyBlockedAction, UpdateCategoryTemporarilyBlockedAction } from '../updatecategorytemporarilyblocked'
@@ -81,6 +82,7 @@ export type SerializedParentAction =
   SerializedSetSendDeviceConnected |
   SerializedSetUserDisableLimitsUntilAction |
   SerializedSetUserTimezoneAction |
+  SerializedUpdateCategoryBatteryLimitAction |
   SerializedUpdateCategoryBlockAllNotificationsAction |
   SerializedUpdateCategoryBlockedTimesAction |
   SerializedUpdateCategoryTemporarilyBlockedAction |
@@ -146,6 +148,8 @@ export const parseParentAction = (action: SerializedParentAction): ParentAction
     return SetUserDisableLimitsUntilAction.parse(action)
   } else if (action.type === 'SET_USER_TIMEZONE') {
     return SetUserTimezoneAction.parse(action)
+  } else if (action.type === 'UPDATE_CATEGORY_BATTERY_LIMIT') {
+    return UpdateCategoryBatteryLimitAction.parse(action)
   } else if (action.type === 'UPDATE_CATEGORY_BLOCK_ALL_NOTIFICATIONS') {
     return UpdateCategoryBlockAllNotificationsAction.parse(action)
   } else if (action.type === 'UPDATE_CATEGORY_BLOCKED_TIMES') {
diff --git a/src/action/updatecategorybatterylimit.ts b/src/action/updatecategorybatterylimit.ts
new file mode 100644
index 0000000..71cf9f2
--- /dev/null
+++ b/src/action/updatecategorybatterylimit.ts
@@ -0,0 +1,69 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { assertIdWithinFamily } from '../util/token'
+import { ParentAction } from './basetypes'
+
+export class UpdateCategoryBatteryLimitAction extends ParentAction {
+  readonly categoryId: string
+  readonly chargeLimit?: number
+  readonly mobileLimit?: number
+
+  constructor ({ categoryId, chargeLimit, mobileLimit }: {
+    categoryId: string
+    chargeLimit?: number
+    mobileLimit?: number
+  }) {
+    super()
+
+    assertIdWithinFamily(categoryId)
+
+    if (chargeLimit !== undefined) {
+      if ((!Number.isSafeInteger(chargeLimit)) || chargeLimit < 0 || chargeLimit > 100) {
+        throw new Error('charge limit out of range')
+      }
+    }
+
+    if (mobileLimit !== undefined) {
+      if ((!Number.isSafeInteger(mobileLimit)) || mobileLimit < 0 || mobileLimit > 100) {
+        throw new Error('mobile limit out of range')
+      }
+    }
+
+    this.categoryId = categoryId
+    this.chargeLimit = chargeLimit
+    this.mobileLimit = mobileLimit
+  }
+
+  serialize = (): SerializedUpdateCategoryBatteryLimitAction => ({
+    type: 'UPDATE_CATEGORY_BATTERY_LIMIT',
+    categoryId: this.categoryId,
+    mobileLimit: this.mobileLimit,
+    chargeLimit: this.chargeLimit
+  })
+
+  static parse = ({ categoryId, chargeLimit, mobileLimit }: SerializedUpdateCategoryBatteryLimitAction) => (
+    new UpdateCategoryBatteryLimitAction({ categoryId, chargeLimit, mobileLimit })
+  )
+}
+
+export interface SerializedUpdateCategoryBatteryLimitAction {
+  type: 'UPDATE_CATEGORY_BATTERY_LIMIT'
+  categoryId: string
+  chargeLimit?: number
+  mobileLimit?: number
+}
diff --git a/src/api/validator.ts b/src/api/validator.ts
index ce1ad26..7959c61 100644
--- a/src/api/validator.ts
+++ b/src/api/validator.ts
@@ -768,6 +768,31 @@ const definitions = {
       "userId"
     ]
   },
+  "SerializedUpdateCategoryBatteryLimitAction": {
+    "type": "object",
+    "properties": {
+      "type": {
+        "type": "string",
+        "enum": [
+          "UPDATE_CATEGORY_BATTERY_LIMIT"
+        ]
+      },
+      "categoryId": {
+        "type": "string"
+      },
+      "chargeLimit": {
+        "type": "number"
+      },
+      "mobileLimit": {
+        "type": "number"
+      }
+    },
+    "additionalProperties": false,
+    "required": [
+      "categoryId",
+      "type"
+    ]
+  },
   "SerializedUpdateCategoryBlockAllNotificationsAction": {
     "type": "object",
     "properties": {
@@ -1619,6 +1644,9 @@ export const isSerializedParentAction: (value: object) => value is SerializedPar
     {
       "$ref": "#/definitions/SerializedSetUserTimezoneAction"
     },
+    {
+      "$ref": "#/definitions/SerializedUpdateCategoryBatteryLimitAction"
+    },
     {
       "$ref": "#/definitions/SerializedUpdateCategoryBlockAllNotificationsAction"
     },
diff --git a/src/database/category.ts b/src/database/category.ts
index d1dba5f..d88e43a 100644
--- a/src/database/category.ts
+++ b/src/database/category.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 Jonas Lochmann
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -48,8 +48,13 @@ export interface CategoryAttributesVersion4 {
   timeWarningFlags: number
 }
 
+export interface CategoryAttributesVersion5 {
+  minBatteryCharging: number
+  minBatteryMobile: number
+}
+
 export type CategoryAttributes = CategoryAttributesVersion1 & CategoryAttributesVersion2 &
-  CategoryAttributesVersion3 & CategoryAttributesVersion4
+  CategoryAttributesVersion3 & CategoryAttributesVersion4 & CategoryAttributesVersion5
 
 export type CategoryModel = Sequelize.Model & CategoryAttributes
 export type CategoryModelStatic = typeof Sequelize.Model & {
@@ -119,11 +124,33 @@ export const attributesVersion4: SequelizeAttributes<CategoryAttributesVersion4>
   }
 }
 
+export const attributesVersion5: SequelizeAttributes<CategoryAttributesVersion5> = {
+  minBatteryMobile: {
+    type: Sequelize.INTEGER,
+    defaultValue: 0,
+    allowNull: false,
+    validate: {
+      min: 0,
+      max: 100
+    }
+  },
+  minBatteryCharging: {
+    type: Sequelize.INTEGER,
+    defaultValue: 0,
+    allowNull: false,
+    validate: {
+      min: 0,
+      max: 100
+    }
+  }
+}
+
 export const attributes: SequelizeAttributes<CategoryAttributes> = {
   ...attributesVersion1,
   ...attributesVersion2,
   ...attributesVersion3,
-  ...attributesVersion4
+  ...attributesVersion4,
+  ...attributesVersion5
 }
 
 export const createCategoryModel = (sequelize: Sequelize.Sequelize): CategoryModelStatic => sequelize.define('Category', attributes) as CategoryModelStatic
diff --git a/src/database/migration/migrations/20200113-add-min-battery-level.ts b/src/database/migration/migrations/20200113-add-min-battery-level.ts
new file mode 100644
index 0000000..bc0c429
--- /dev/null
+++ b/src/database/migration/migrations/20200113-add-min-battery-level.ts
@@ -0,0 +1,46 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { QueryInterface, Sequelize, Transaction } from 'sequelize'
+import { attributesVersion5 as categoryAttributes } from '../../category'
+
+export async function up (queryInterface: QueryInterface, sequelize: Sequelize) {
+  await sequelize.transaction({
+    type: Transaction.TYPES.EXCLUSIVE
+  }, async (transaction) => {
+    await queryInterface.addColumn('Categories', 'minBatteryMobile', {
+      ...categoryAttributes.minBatteryMobile
+    }, {
+      transaction
+    })
+
+    await queryInterface.addColumn('Categories', 'minBatteryCharging', {
+      ...categoryAttributes.minBatteryCharging
+    }, {
+      transaction
+    })
+  })
+}
+
+export async function down (queryInterface: QueryInterface, sequelize: Sequelize) {
+  await sequelize.transaction({
+    type: Transaction.TYPES.EXCLUSIVE
+  }, async (transaction) => {
+    await queryInterface.removeColumn('Categories', 'minBatteryMobile', { transaction })
+    await queryInterface.removeColumn('Categories', 'minBatteryCharging', { transaction })
+  })
+}
diff --git a/src/function/sync/apply-actions/dispatch-parent-action/index.ts b/src/function/sync/apply-actions/dispatch-parent-action/index.ts
index 78f445a..4ce2b0c 100644
--- a/src/function/sync/apply-actions/dispatch-parent-action/index.ts
+++ b/src/function/sync/apply-actions/dispatch-parent-action/index.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 Jonas Lochmann
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -43,6 +43,7 @@ import {
   SetSendDeviceConnected,
   SetUserDisableLimitsUntilAction,
   SetUserTimezoneAction,
+  UpdateCategoryBatteryLimitAction,
   UpdateCategoryBlockAllNotificationsAction,
   UpdateCategoryBlockedTimesAction,
   UpdateCategoryTemporarilyBlockedAction,
@@ -82,6 +83,7 @@ import { dispatchSetRelaxPrimaryDevice } from './setrelaxprimarydevice'
 import { dispatchSetSendDeviceConnected } from './setsenddeviceconnected'
 import { dispatchUserSetDisableLimitsUntil } from './setuserdisablelmitsuntil'
 import { dispatchSetUserTimezone } from './setusertimezone'
+import { dispatchUpdateCategoryBatteryLimit } from './updatecategorybatterylimit'
 import { dispatchUpdateCategoryBlockAllNotifications } from './updatecategoryblockallnotifications'
 import { dispatchUpdateCategoryBlockedTimes } from './updatecategoryblockedtimes'
 import { dispatchUpdateCategoryTemporarilyBlocked } from './updatecategorytemporarilyblocked'
@@ -140,6 +142,8 @@ export const dispatchParentAction = async ({ action, cache, parentUserId, source
     await dispatchUserSetDisableLimitsUntil({ action, cache })
   } else if (action instanceof SetUserTimezoneAction) {
     await dispatchSetUserTimezone({ action, cache })
+  } else if (action instanceof UpdateCategoryBatteryLimitAction) {
+    await dispatchUpdateCategoryBatteryLimit({ action, cache })
   } else if (action instanceof UpdateCategoryBlockAllNotificationsAction) {
     await dispatchUpdateCategoryBlockAllNotifications({ action, cache })
   } else if (action instanceof UpdateCategoryBlockedTimesAction) {
diff --git a/src/function/sync/apply-actions/dispatch-parent-action/updatecategorybatterylimit.ts b/src/function/sync/apply-actions/dispatch-parent-action/updatecategorybatterylimit.ts
new file mode 100644
index 0000000..3f94679
--- /dev/null
+++ b/src/function/sync/apply-actions/dispatch-parent-action/updatecategorybatterylimit.ts
@@ -0,0 +1,49 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { UpdateCategoryBatteryLimitAction } from '../../../../action'
+import { Cache } from '../cache'
+
+export async function dispatchUpdateCategoryBatteryLimit ({ action, cache }: {
+  action: UpdateCategoryBatteryLimitAction
+  cache: Cache
+}) {
+  const categoryEntry = await cache.database.category.findOne({
+    where: {
+      familyId: cache.familyId,
+      categoryId: action.categoryId
+    },
+    transaction: cache.transaction
+  })
+
+  if (!categoryEntry) {
+    throw new Error('invalid category id')
+  }
+
+  if (action.chargeLimit !== undefined) {
+    categoryEntry.minBatteryCharging = action.chargeLimit
+  }
+
+  if (action.mobileLimit !== undefined) {
+    categoryEntry.minBatteryMobile = action.mobileLimit
+  }
+
+  await categoryEntry.save({ transaction: cache.transaction })
+
+  cache.categoriesWithModifiedBaseData.push(action.categoryId)
+  cache.areChangesImportant = true
+}
diff --git a/src/function/sync/get-server-data-status.ts b/src/function/sync/get-server-data-status.ts
index bba8e39..e93c379 100644
--- a/src/function/sync/get-server-data-status.ts
+++ b/src/function/sync/get-server-data-status.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 Jonas Lochmann
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -339,7 +339,9 @@ export const generateServerDataStatus = async ({ database, clientStatus, familyI
         'baseVersion',
         'parentCategoryId',
         'blockAllNotifications',
-        'timeWarningFlags'
+        'timeWarningFlags',
+        'minBatteryCharging',
+        'minBatteryMobile'
       ],
       transaction
     })).map((item) => ({
@@ -352,7 +354,9 @@ export const generateServerDataStatus = async ({ database, clientStatus, familyI
       baseVersion: item.baseVersion,
       parentCategoryId: item.parentCategoryId,
       blockAllNotifications: item.blockAllNotifications,
-      timeWarningFlags: item.timeWarningFlags
+      timeWarningFlags: item.timeWarningFlags,
+      minBatteryCharging: item.minBatteryCharging,
+      minBatteryMobile: item.minBatteryMobile
     }))
 
     result.categoryBase = dataForSyncing.map((item): ServerUpdatedCategoryBaseData => ({
@@ -365,7 +369,9 @@ export const generateServerDataStatus = async ({ database, clientStatus, familyI
       version: item.baseVersion,
       parentCategoryId: item.parentCategoryId,
       blockAllNotifications: item.blockAllNotifications,
-      timeWarnings: item.timeWarningFlags
+      timeWarnings: item.timeWarningFlags,
+      mblMobile: item.minBatteryMobile,
+      mblCharging: item.minBatteryCharging
     }))
   }
 
diff --git a/src/object/serverdatastatus.ts b/src/object/serverdatastatus.ts
index ca1e553..e514ff1 100644
--- a/src/object/serverdatastatus.ts
+++ b/src/object/serverdatastatus.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 Jonas Lochmann
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -104,6 +104,9 @@ export interface ServerUpdatedCategoryBaseData {
   parentCategoryId: string
   blockAllNotifications: boolean
   timeWarnings: number
+  // mbl = minimum battery level
+  mblCharging: number
+  mblMobile: number
 }
 
 export interface ServerUpdatedCategoryAssignedApps {