fix(llm): let upkeep run on battery with limits; tasks always run on time

CHANGELOG.md

@@ -225,6 +225,13 @@ and versions follow [Semantic Versioning](https://semver.org/).
 ### Fixed
 - Chats using Claude through your own Claude Code now show the context meter and the "getting long" warning at
   85%: the context length is read from the matching Anthropic model, which LiteLLM knows, instead of nothing.
+- **Background work on a laptop that stays on battery:** Sentient's own upkeep (memory, what it learns about you,
+  dreams, suggestions, skill review, chat titles) used to wait for the charger, so a laptop used all day on battery
+  never ran it. It now runs on battery too, gently: while the battery is above 40%, after you have not chatted for
+  five minutes, in short bursts at most every 30 minutes, and never held more than two hours. At 15% or below it
+  waits. Tasks you scheduled always run on time, whatever the battery, and so does Dream now unless the battery is
+  low. The title bar says "Waiting: on battery" (or
+  "Waiting: battery low") while upkeep waits, and every limit is in Settings > Models > Sharing your local model.
 - Messages and memories saved at the same moment now always keep their order, and the daily upkeep of MEMORY.md and
   USER.md no longer misses a memory saved while it was reading. Summarizing a long chat no longer skips messages
   saved at the same moment as the last summary.

desktop/src/components/shell/ModelBusy.tsx

@@ -1,6 +1,6 @@
 /**
  * #149 One local model job at a time: a small title bar indicator, shown while the local model works on something
- * other than your chat, while something waits for it, or while background work is paused on battery.
+ * other than your chat, while something waits for it, or while Sentient's own upkeep waits on battery (#296).
  */
 import { Tooltip, StatusDot } from '@/components/ui'
 import { useModelBusy } from '@/hooks/models'
@@ -19,22 +19,30 @@ const JOB: Record<ModelJobKind, { short: string; doing: string }> = {
   background: { short: 'background work', doing: 'doing background work' }
 }
 
+const BATTERY_TIP: Record<'battery' | 'battery_low', string> = {
+  battery:
+    "Sentient's own upkeep (memory, suggestions, chat titles) is waiting because this computer is on battery. " +
+    'It runs now and then once the battery is above your limit and you have stopped chatting for a few minutes. ' +
+    'It never waits longer than the limit in Settings > Models. Your chats and the tasks you scheduled run on time.',
+  battery_low:
+    "Sentient's own upkeep (memory, suggestions, chat titles) is waiting because the battery is low. " +
+    'It never waits longer than the limit in Settings > Models. Your chats and the tasks you scheduled still run on time.'
+}
+
 export function modelBusyText(s: ModelBusy): { label: string; detail: string | null; tip: string } | null {
-  const battery = s.deferred_reason === 'battery'
+  // #296: on battery only Sentient's own upkeep waits, never your chats or tasks; say so honestly
+  const battery = s.deferred_reason === 'battery' || s.deferred_reason === 'battery_low' ? s.deferred_reason : null
   if (!(s.busy && (s.job !== 'chat' || s.waiting > 0)) && !battery) return null
   const lines: string[] = []
   if (s.busy && s.job) {
     const name = modelShortName(s.model) || 'Your local model'
     lines.push(`${name} is ${JOB[s.job]?.doing ?? 'busy'}. It does one job at a time so it stays fast.`)
   }
   if (s.waiting > 0) lines.push(`${s.waiting} more waiting. Your chats always go first.`)
-  if (battery) lines.push('Background work waits until you plug in. You can change this in Settings > Models.')
+  if (battery) lines.push(BATTERY_TIP[battery])
   else if (s.deferred > 0) lines.push('Background work waits until you have stopped chatting for a moment.')
-  return {
-    label: s.busy ? 'Model busy' : 'Paused on battery',
-    detail: s.busy && s.job ? JOB[s.job]?.short ?? null : null,
-    tip: lines.join(' ')
-  }
+  if (s.busy) return { label: 'Model busy', detail: s.job ? JOB[s.job]?.short ?? null : null, tip: lines.join(' ') }
+  return { label: 'Waiting', detail: battery === 'battery_low' ? 'battery low' : 'on battery', tip: lines.join(' ') }
 }
 
 export function ModelBusyIndicator() {
@@ -50,7 +58,10 @@ export function ModelBusyIndicator() {
         className="no-drag flex h-6.5 max-w-60 items-center gap-1.5 rounded-full border border-border bg-surface/60 px-2.5 text-xs text-fg-muted"
       >
         <StatusDot tone={data.busy ? 'info' : 'warning'} pulse={data.busy} />
-        <span className="shrink-0 font-medium text-fg">{text.label}</span>
+        <span className="shrink-0 font-medium text-fg">
+          {text.label}
+          {!data.busy && text.detail ? ':' : ''}
+        </span>
         {text.detail && <span className="truncate text-fg-subtle">{text.detail}</span>}
         {data.waiting > 0 && (
           <span className="shrink-0 rounded-full bg-active px-1.5 text-[10px] font-medium text-fg-muted">+{data.waiting}</span>

desktop/src/features/settings/SchemaForm.tsx

@@ -40,7 +40,12 @@ export const LABELS: Record<string, FieldLabel> = {
   // models (#149)
   'models.local_queue': { label: 'One job at a time, your chats first' },
   'models.background_quiet_s': { label: 'Background work waits after you chat', unit: 's' },
-  'models.background_on_battery': { label: 'Background work on battery' },
+  'models.background_on_battery': { label: 'Lift the battery limits for upkeep' },
+  'models.battery_min_percent': { label: 'On battery, upkeep needs more than', unit: '%' },
+  'models.battery_critical_percent': { label: 'Battery low: upkeep waits at or below', unit: '%' },
+  'models.battery_idle_s': { label: 'On battery, upkeep waits after you chat', unit: 's' },
+  'models.battery_upkeep_every_s': { label: 'On battery, upkeep runs at most every', unit: 's' },
+  'models.battery_max_wait_s': { label: 'Upkeep never waits longer than', unit: 's' },
   // tasks
   'backups.schedule': { label: 'Back up automatically' },
   'backups.keep': { label: 'Automatic backups to keep' },

desktop/src/features/settings/sections/Models.tsx

@@ -92,7 +92,16 @@ const ROLE_ICON: Record<RoleName, Icon> = {
 }
 
 /** #149: one local model job at a time, your chats first. */
-const MODEL_QUEUE_KEYS = ['models.local_queue', 'models.background_quiet_s', 'models.background_on_battery']
+const MODEL_QUEUE_KEYS = [
+  'models.local_queue',
+  'models.background_quiet_s',
+  'models.background_on_battery',
+  'models.battery_min_percent',
+  'models.battery_critical_percent',
+  'models.battery_idle_s',
+  'models.battery_upkeep_every_s',
+  'models.battery_max_wait_s'
+]
 
 export function ModelsSection({ query }: SectionProps) {
   const { config } = useConfigEditor()

desktop/src/lib/types.ts

@@ -73,7 +73,8 @@ export interface ModelBusy {
   waiting: number
   /** Background jobs held back while you chat or on battery. */
   deferred: number
-  deferred_reason: 'chat' | 'battery' | null
+  /** #296: on battery only Sentient's own upkeep waits; `battery_low` at or below `battery_critical_percent`. */
+  deferred_reason: 'chat' | 'battery' | 'battery_low' | null
 }
 
 export interface StopResult extends StopState {
@@ -139,6 +140,12 @@ export interface ModelsConfig {
   local_queue?: boolean
   background_quiet_s?: number
   background_on_battery?: boolean
+  /** #296: how upkeep behaves on battery. Tasks always run on time. */
+  battery_min_percent?: number
+  battery_critical_percent?: number
+  battery_idle_s?: number
+  battery_upkeep_every_s?: number
+  battery_max_wait_s?: number
 }
 
 export interface GatewayConfig {

docs/API.md

@@ -328,10 +328,23 @@ accept or loosen a rule.
   `memory` (memory notes after a reply, compression, the user model, dreams), `skills`, `titles`, `background`. Waiting
   calls go in that order, then first come first served; a running call is never cut off. `waiting` counts calls that go
   as soon as the model is free; `deferred` counts background calls (`task` and below) held back although it may be
-  free, with `deferred_reason`: `"chat"` while a chat reply runs or ended less than `models.background_quiet_s`
-  (default 30) seconds ago, `"battery"` while the computer runs on battery (Windows, macOS and Linux power status) and
-  `models.background_on_battery` is off (the default). Work a running chat reply waits on is never held back, and a
-  reply that has not used the model for 60 seconds stops holding background work back, so the queue can't deadlock.
+  free, with `deferred_reason` (the most telling one when several apply: `battery_low`, then `battery`, then
+  `chat`): `"chat"` while a chat reply runs or ended less than `models.background_quiet_s` (default 30) seconds ago;
+  `"battery"` or `"battery_low"` while Sentient's own upkeep waits on battery (#296). Battery holds apply only to
+  upkeep (`suggestions`, `memory`, `skills`, `titles`, `background`); `task` calls run on time at any battery level.
+  On battery (Windows, macOS and Linux power status) upkeep goes only while the battery is above
+  `models.battery_min_percent` (default 40), you have not chatted for `models.battery_idle_s` (default 300), and in
+  bursts at most every `models.battery_upkeep_every_s` (default 1800; a burst stays open while upkeep keeps using the
+  model, so a pass of several calls finishes together); `models.background_on_battery` (default off) lifts these
+  three limits. At or below `models.battery_critical_percent` (default 15) upkeep is `"battery_low"` and waits even
+  with that switch on. Whatever the battery, no call waits longer than `models.battery_max_wait_s` (default 7200)
+  because of it; a call the cap lets go opens a burst too, so the rest of its pass follows at once (a burst lasts at
+  most 5 minutes). Upkeep a person starts from the window (`POST /api/memories/dreams/run`, Dream now) skips the usual
+  limits: on battery only `models.battery_critical_percent` (and the cap) holds it, as `"battery_low"`. When the cap
+  lets it go, the rest of it follows in a burst of its own; scheduled upkeep never rides along. Work a running chat reply waits on is never held back, and a reply that has not used the model for
+  60 seconds stops holding background work back, so the queue can't deadlock. For tests and debugging only, the
+  engine's `SENTIENT_DEBUG_BATTERY` environment variable fakes the reading: `ac` (plugged in), `battery` (on battery,
+  level unknown) or a percent from 0 to 100 (on battery at that level).
   A stream holds the model until its last chunk; cancelling (Stop everything) frees it.
 - `GET /api/models/claude-code` → `{enabled, installed, version, detail, models}`: Claude through the user's own
   Claude Code (experimental, ADR 0022). `enabled` is `models.experimental_claude_code` (default false). `installed`

docs/DEVELOPING.md

@@ -88,6 +88,11 @@ When several people build and capture screenshots at once, take `desktop/.build.
 .venv/Scripts/ruff.exe check sentient tests
 ```
 
+To check how background work behaves on battery on a computer that is plugged in, start the engine with
+`SENTIENT_DEBUG_BATTERY` set: `ac`, `battery`, or a percent such as `35` or `10` (tests and debugging only; the
+engine logs a warning while it is set). The engine log then shows `model job held: ... (on battery ...)`,
+`upkeep burst on battery` and `model job released: ...` lines.
+
 No test touches the network; the LLM is a scripted, deterministic fake
 (`tests/conftest.py`). Browser tests drive a hidden local Edge or Chrome against local pages and skip
 when none can start; Docker sandbox tests skip when Docker is not running. The suite is large: on a busy

sentient/config/schema.py

@@ -205,8 +205,32 @@ class ModelsConfig(BaseModel):
     )
     background_on_battery: bool = Field(
         False,
-        description="Let background work use a local model while this computer runs on battery. When off, it waits "
-        "until you plug in. Your chats always run.",
+        description="Let Sentient's own upkeep (memory, suggestions, skill review, chat titles) use a local model on "
+        "battery as freely as when plugged in, except when the battery is low (below). When off, upkeep still runs on "
+        "battery, with the limits below. Your chats and the tasks you scheduled always run on time.",
+    )
+    battery_min_percent: int = Field(
+        40, ge=0, le=100,
+        description="On battery, Sentient's own upkeep uses a local model only while the battery is above this "
+        "percent. Your tasks run on time at any level.",
+    )
+    battery_critical_percent: int = Field(
+        15, ge=0, le=100,
+        description="At or below this battery percent, upkeep waits even when it is allowed on battery. Your tasks "
+        "still run.",
+    )
+    battery_idle_s: int = Field(
+        300, ge=0, le=7200,
+        description="On battery, upkeep waits until you have not chatted for this many seconds.",
+    )
+    battery_upkeep_every_s: int = Field(
+        1800, ge=0, le=86400,
+        description="On battery, upkeep runs in short bursts at most this often, in seconds. 0 lets it run "
+        "whenever the other limits allow.",
+    )
+    battery_max_wait_s: int = Field(
+        7200, ge=60, le=86400,
+        description="Upkeep never waits longer than this many seconds because of the battery, whatever its level.",
     )