diff --git a/memos/cmds/library.py b/memos/cmds/library.py
index b862999..51c93b9 100644
--- a/memos/cmds/library.py
+++ b/memos/cmds/library.py
@@ -13,9 +13,12 @@ from magika import Magika
 from datetime import datetime
 from enum import Enum
 from typing import List, Tuple
+from functools import lru_cache
+
 import re
 import os
 import time
+import psutil
 
 from collections import defaultdict, deque
 from watchdog.observers import Observer
@@ -28,7 +31,7 @@ from memos.schemas import MetadataSource
 from memos.logging_config import LOGGING_CONFIG
 import logging.config
 
-# 配置日志
+
 logging.config.dictConfig(LOGGING_CONFIG)
 logger = logging.getLogger(__name__)
 
@@ -537,7 +540,9 @@ async def update_entity(
 def reindex(
     library_id: int,
     folders: List[int] = typer.Option(None, "--folder", "-f"),
-    force: bool = typer.Option(False, "--force", help="Force recreate FTS and vector tables before reindexing"),
+    force: bool = typer.Option(
+        False, "--force", help="Force recreate FTS and vector tables before reindexing"
+    ),
 ):
     print(f"Reindexing library {library_id}")
 
@@ -565,7 +570,7 @@ def reindex(
 
     with httpx.Client(timeout=60) as client:
         total_entities = 0
-        
+
         # Get total entity count for all folders
         for folder in library_folders:
             response = client.get(
@@ -575,7 +580,9 @@ def reindex(
             if response.status_code == 200:
                 total_entities += int(response.headers.get("X-Total-Count", 0))
             else:
-                print(f"Failed to get entity count for folder {folder['id']}: {response.status_code} - {response.text}")
+                print(
+                    f"Failed to get entity count for folder {folder['id']}: {response.status_code} - {response.text}"
+                )
 
         # Now process entities with a progress bar
         with tqdm(total=total_entities, desc="Reindexing entities") as pbar:
@@ -591,7 +598,9 @@ def reindex(
                         params={"limit": limit, "offset": offset},
                     )
                     if entities_response.status_code != 200:
-                        print(f"Failed to get entities: {entities_response.status_code} - {entities_response.text}")
+                        print(
+                            f"Failed to get entities: {entities_response.status_code} - {entities_response.text}"
+                        )
                         break
 
                     entities = entities_response.json()
@@ -603,12 +612,16 @@ def reindex(
                         if entity["id"] in scanned_entities:
                             continue
 
-                        update_response = client.post(f"{BASE_URL}/entities/{entity['id']}/last-scan-at")
+                        update_response = client.post(
+                            f"{BASE_URL}/entities/{entity['id']}/last-scan-at"
+                        )
                         if update_response.status_code != 204:
-                            print(f"Failed to update last_scan_at for entity {entity['id']}: {update_response.status_code} - {update_response.text}")
+                            print(
+                                f"Failed to update last_scan_at for entity {entity['id']}: {update_response.status_code} - {update_response.text}"
+                            )
                         else:
                             scanned_entities.add(entity["id"])
-                        
+
                         pbar.update(1)
 
                     offset += limit
@@ -844,7 +857,9 @@ def sync(
                     "key": key,
                     "value": str(value),
                     "source": MetadataSource.SYSTEM_GENERATED.value,
-                    "data_type": "number" if isinstance(value, (int, float)) else "text",
+                    "data_type": (
+                        "number" if isinstance(value, (int, float)) else "text"
+                    ),
                 }
                 for key, value in metadata.items()
                 if key != IS_THUMBNAIL
@@ -860,14 +875,18 @@ def sync(
 
         if is_thumbnail:
             new_entity["file_created_at"] = existing_entity["file_created_at"]
-            new_entity["file_last_modified_at"] = existing_entity["file_last_modified_at"]
+            new_entity["file_last_modified_at"] = existing_entity[
+                "file_last_modified_at"
+            ]
             new_entity["file_type"] = existing_entity["file_type"]
             new_entity["file_type_group"] = existing_entity["file_type_group"]
             new_entity["size"] = existing_entity["size"]
 
         # Merge existing metadata with new metadata
         if new_entity.get("metadata_entries"):
-            new_metadata_keys = {entry["key"] for entry in new_entity["metadata_entries"]}
+            new_metadata_keys = {
+                entry["key"] for entry in new_entity["metadata_entries"]
+            }
             for existing_entry in existing_entity["metadata_entries"]:
                 if existing_entry["key"] not in new_metadata_keys:
                     new_entity["metadata_entries"].append(existing_entry)
@@ -928,6 +947,16 @@ def sync(
             raise typer.Exit(code=1)
 
 
+@lru_cache(maxsize=1)
+def is_on_battery():
+    try:
+        battery = psutil.sensors_battery()
+        return battery is not None and not battery.power_plugged
+    except:
+        return False  # If unable to detect battery status, assume not on battery
+
+
+# Modify the LibraryFileHandler class
 class LibraryFileHandler(FileSystemEventHandler):
     def __init__(
         self,
@@ -945,7 +974,7 @@ class LibraryFileHandler(FileSystemEventHandler):
         self.executor = ThreadPoolExecutor(max_workers=max_workers)
         self.lock = threading.Lock()
 
-        self.sparsity_window = 6
+        self.sparsity_window = 12
         self.sparsity_factor = sparsity_factor
         self.window_size = window_size
 
@@ -958,6 +987,10 @@ class LibraryFileHandler(FileSystemEventHandler):
         self.file_skipped = 0
         self.logger = logger
 
+        self.base_sparsity_window = self.sparsity_window
+        self.last_battery_check = 0
+        self.battery_check_interval = 60  # Check battery status every 60 seconds
+
     def handle_event(self, event):
         if not event.is_directory and self.is_valid_file(event.src_path):
             current_time = time.time()
@@ -998,7 +1031,7 @@ class LibraryFileHandler(FileSystemEventHandler):
         for path in files_to_process:
             self.executor.submit(self.process_file, path)
             self.file_submitted += 1
-            
+
         if processed_in_current_loop > 0:
             self.logger.info(
                 f"File count: {self.file_count}, Files submitted: {self.file_submitted}, Files synced: {self.file_synced}, Files skipped: {self.file_skipped}"
@@ -1019,12 +1052,15 @@ class LibraryFileHandler(FileSystemEventHandler):
         min_samples = max(3, self.window_size // 3)
         max_interval = 60  # Maximum allowed interval between events in seconds
 
-        if len(self.pending_times) >= min_samples and len(self.sync_times) >= min_samples:
+        if (
+            len(self.pending_times) >= min_samples
+            and len(self.sync_times) >= min_samples
+        ):
             # Filter out large time gaps
             filtered_intervals = [
-                self.pending_times[i] - self.pending_times[i-1]
+                self.pending_times[i] - self.pending_times[i - 1]
                 for i in range(1, len(self.pending_times))
-                if self.pending_times[i] - self.pending_times[i-1] <= max_interval
+                if self.pending_times[i] - self.pending_times[i - 1] <= max_interval
             ]
 
             if filtered_intervals:
@@ -1034,18 +1070,34 @@ class LibraryFileHandler(FileSystemEventHandler):
                 pending_files_per_second = 0
 
             sync_time_total = sum(self.sync_times)
-            sync_files_per_second = len(self.sync_times) / sync_time_total if sync_time_total > 0 else 0
+            sync_files_per_second = (
+                len(self.sync_times) / sync_time_total if sync_time_total > 0 else 0
+            )
 
             if pending_files_per_second > 0 and sync_files_per_second > 0:
                 rate = pending_files_per_second / sync_files_per_second
                 new_sparsity_window = max(1, math.ceil(self.sparsity_factor * rate))
 
+                current_time = time.time()
+                if current_time - self.last_battery_check > self.battery_check_interval:
+                    self.last_battery_check = current_time
+                    is_on_battery.cache_clear()  # Clear the cache to get fresh battery status
+                new_sparsity_window = (
+                    new_sparsity_window * 2 if is_on_battery() else new_sparsity_window
+                )
+
                 if new_sparsity_window != self.sparsity_window:
                     old_sparsity_window = self.sparsity_window
                     self.sparsity_window = new_sparsity_window
-                    self.logger.info(f"Updated sparsity window: {old_sparsity_window} -> {self.sparsity_window}")
-                    self.logger.debug(f"Pending files per second: {pending_files_per_second:.2f}")
-                    self.logger.debug(f"Sync files per second: {sync_files_per_second:.2f}")
+                    self.logger.info(
+                        f"Updated sparsity window: {old_sparsity_window} -> {self.sparsity_window}"
+                    )
+                    self.logger.debug(
+                        f"Pending files per second: {pending_files_per_second:.2f}"
+                    )
+                    self.logger.debug(
+                        f"Sync files per second: {sync_files_per_second:.2f}"
+                    )
                     self.logger.debug(f"Rate (pending/sync): {rate:.2f}")
 
     def is_valid_file(self, path):
@@ -1091,7 +1143,9 @@ def watch(
     window_size: int = typer.Option(
         10, "--window-size", "-ws", help="Window size for rate calculation"
     ),
-    verbose: bool = typer.Option(False, "--verbose", "-v", help="Enable verbose logging")
+    verbose: bool = typer.Option(
+        False, "--verbose", "-v", help="Enable verbose logging"
+    ),
 ):
     """
     Watch for file changes in the library folders and sync automatically.
@@ -1099,7 +1153,7 @@ def watch(
     # Set the logging level based on the verbose flag
     log_level = "DEBUG" if verbose else "INFO"
     logger.setLevel(log_level)
-    
+
     logger.info(f"Watching library {library_id} for changes...")
 
     # Get the library
@@ -1147,4 +1201,4 @@ def watch(
         observer.stop()
         for handler in handlers:
             handler.executor.shutdown(wait=True)
-    observer.join()
\ No newline at end of file
+    observer.join()
diff --git a/web/src/routes/+page.svelte b/web/src/routes/+page.svelte
index 60bc491..b196076 100644
--- a/web/src/routes/+page.svelte
+++ b/web/src/routes/+page.svelte
@@ -276,7 +276,7 @@
 			type="text"
 			class={inputClasses}
 			bind:value={searchString}
-			placeholder="Type to search..."
+			placeholder="Input keyword to search or press Enter to show latest records"
 			on:keydown={handleEnterPress}
 			autofocus
 		/>