diff --git a/lib/influxdb2/client/point.rb b/lib/influxdb2/client/point.rb
index 8d1d5bbd..fa87179d 100644
--- a/lib/influxdb2/client/point.rb
+++ b/lib/influxdb2/client/point.rb
@@ -45,7 +45,7 @@ def initialize(name:, tags: nil, fields: nil, time: nil, precision: DEFAULT_WRIT
       @time = time
       @precision = precision
     end
-    attr_writer :precision
+    attr_reader :precision
 
     # Create DataPoint instance from specified data.
     #
diff --git a/lib/influxdb2/client/write_api.rb b/lib/influxdb2/client/write_api.rb
index 2cf38726..7c3e32a5 100644
--- a/lib/influxdb2/client/write_api.rb
+++ b/lib/influxdb2/client/write_api.rb
@@ -158,7 +158,7 @@ def initialize(key, data)
 
     # Key for batch item
     class BatchItemKey
-      def initialize(bucket, org, precision = DEFAULT_WRITE_PRECISION)
+      def initialize(bucket, org, precision: DEFAULT_WRITE_PRECISION)
         @bucket = bucket
         @org = org
         @precision = precision
@@ -197,7 +197,8 @@ def _generate_payload(data, precision: nil, bucket: nil, org: nil)
       if data.nil?
         nil
       elsif data.is_a?(Point)
-        _generate_payload(data.to_line_protocol, bucket: bucket, org: org, precision: data.precision)
+        _generate_payload(data.to_line_protocol, bucket: bucket, org: org, precision: data.precision ||
+            DEFAULT_WRITE_PRECISION)
       elsif data.is_a?(String)
         if data.empty?
           nil