diff --git a/src/server/api/contracts/battery.contract.ts b/src/server/api/contracts/battery.contract.ts
new file mode 100644
index 0000000..00932f3
--- /dev/null
+++ b/src/server/api/contracts/battery.contract.ts
@@ -0,0 +1,13 @@
+import { oc } from '@orpc/contract'
+import { z } from 'zod'
+import { batteriesResponseSchema, dashboardSnapshotSchema } from '@/domain/battery'
+
+export const dashboard = oc.input(z.void()).output(dashboardSnapshotSchema)
+
+export const batteries = oc
+  .input(
+    z.object({
+      mac: z.string().min(1).optional(),
+    }),
+  )
+  .output(batteriesResponseSchema)
diff --git a/src/server/api/contracts/index.ts b/src/server/api/contracts/index.ts
index 669cfd5..a4adbe7 100644
--- a/src/server/api/contracts/index.ts
+++ b/src/server/api/contracts/index.ts
@@ -1,7 +1,7 @@
-import * as todo from './todo.contract'
+import * as battery from './battery.contract'
 
 export const contract = {
-  todo,
+  battery,
 }
 
 export type Contract = typeof contract