diff --git a/ketcher-autotests/tests/Structure-Creating-&-Editing/SMARTS-attributes/Atom-properties-attributes/atom-properties-attributes.spec.ts b/ketcher-autotests/tests/Structure-Creating-&-Editing/SMARTS-attributes/Atom-properties-attributes/atom-properties-attributes.spec.ts
index 681af557e5..3e3ec3a41d 100644
--- a/ketcher-autotests/tests/Structure-Creating-&-Editing/SMARTS-attributes/Atom-properties-attributes/atom-properties-attributes.spec.ts
+++ b/ketcher-autotests/tests/Structure-Creating-&-Editing/SMARTS-attributes/Atom-properties-attributes/atom-properties-attributes.spec.ts
@@ -140,11 +140,9 @@ test.describe('Checking atom properties attributes in SMARTS format', () => {
   });
 
   test('Check that cannot add Charge more than -15', async ({ page }) => {
-    test.fail();
     /**
      * Test case: https://github.com/epam/ketcher/issues/3943
      * Description: Validation should be added +-15 range allowed only
-     * This test will fail until https://github.com/epam/ketcher/issues/3943 is fixed
      */
     await setCharge(page, '-16');
     const applyButton = await page.getByText('Apply');
@@ -153,11 +151,9 @@ test.describe('Checking atom properties attributes in SMARTS format', () => {
   });
 
   test('Check that cannot add Charge more than 15', async ({ page }) => {
-    test.fail();
     /**
      * Test case: https://github.com/epam/ketcher/issues/3943
      * Description: Validation should be added +-15 range allowed only
-     * This test will fail until https://github.com/epam/ketcher/issues/3943 is fixed
      */
     await setCharge(page, '16');
     const applyButton = await page.getByText('Apply');
diff --git a/packages/ketcher-react/src/script/ui/data/convert/structconv.js b/packages/ketcher-react/src/script/ui/data/convert/structconv.js
index 88b5fec0d3..649e68eb1e 100644
--- a/packages/ketcher-react/src/script/ui/data/convert/structconv.js
+++ b/packages/ketcher-react/src/script/ui/data/convert/structconv.js
@@ -21,14 +21,13 @@ import {
   StereoLabel,
   getAtomType,
 } from 'ketcher-core';
-
-import { atom as atomSchema } from '../schema/struct-schema';
 import { capitalize } from 'lodash/fp';
 import {
   sdataSchema,
   getSdataDefault,
   sdataCustomSchema,
 } from '../schema/sdata-schema';
+import { matchCharge } from '../utils';
 
 const DefaultStereoGroupNumber = 1;
 
@@ -183,13 +182,14 @@ export function toAtom(atom) {
       exactChangeFlag: 0,
     });
   }
-  const chargeRegexp = new RegExp(atomSchema.properties.charge.pattern);
-  const pch = chargeRegexp.exec(restAtom.charge);
+  const pch = matchCharge(restAtom.charge);
   const charge = pch ? parseInt(pch[1] + pch[3] + pch[2]) : restAtom.charge;
 
   const conv = Object.assign({}, restAtom, {
     isotope: restAtom.isotope ? Number(restAtom.isotope) : null,
-    charge: restAtom.charge ? Number(charge) : null,
+    // empty charge value by default treated as zero,
+    // no need to pass and display zero values(0, -0) explicitly
+    charge: restAtom.charge && charge !== 0 ? Number(charge) : null,
     alias: restAtom.alias || null,
     exactChangeFlag: +(restAtom.exactChangeFlag ?? false),
     unsaturatedAtom: +(restAtom.unsaturatedAtom ?? false),
diff --git a/packages/ketcher-react/src/script/ui/data/schema/struct-schema.js b/packages/ketcher-react/src/script/ui/data/schema/struct-schema.js
index f9c1e4857d..cf4775e90d 100644
--- a/packages/ketcher-react/src/script/ui/data/schema/struct-schema.js
+++ b/packages/ketcher-react/src/script/ui/data/schema/struct-schema.js
@@ -58,7 +58,7 @@ export const atom = {
     charge: {
       title: 'Charge',
       type: 'string',
-      pattern: '^([+-]?)([0-9]{1,3})([+-]?)$',
+      pattern: '^([+-]?)(1[0-5]|0|[0-9])([+-]?)$',
       maxLength: 4,
       default: '',
       invalidMessage: 'Invalid charge value',
diff --git a/packages/ketcher-react/src/script/ui/data/utils.test.ts b/packages/ketcher-react/src/script/ui/data/utils.test.ts
new file mode 100644
index 0000000000..8f3e10224e
--- /dev/null
+++ b/packages/ketcher-react/src/script/ui/data/utils.test.ts
@@ -0,0 +1,50 @@
+import { matchCharge } from 'src/script/ui/data/utils';
+
+describe('data utils', () => {
+  describe('matchCharge', () => {
+    it('should return null for empty string', () => {
+      const result = matchCharge('');
+      expect(result).toBeNull();
+    });
+    it('should return null for string with positive out of range charge', () => {
+      const result = matchCharge('16');
+      expect(result).toBeNull();
+    });
+    it('should return null for string with negative out of range charge', () => {
+      const result = matchCharge('-16');
+      expect(result).toBeNull();
+    });
+    it('should return expected matched array for string with zero charge', () => {
+      const expectedMatchGroups = ['', '0', ''];
+      const [, signBefore, absoluteValue, signAfter] = matchCharge('0') || [];
+      expect([signBefore, absoluteValue, signAfter]).toEqual(
+        expectedMatchGroups,
+      );
+    });
+    it('should return expected matched array for string with negative zero charge', () => {
+      const expectedMatchGroups = ['-', '0', ''];
+      const [, signBefore, absoluteValue, signAfter] = matchCharge('-0') || [];
+      expect([signBefore, absoluteValue, signAfter]).toEqual(
+        expectedMatchGroups,
+      );
+    });
+    it('should return expected matched array for string with negative zero charge after', () => {
+      const expectedMatchGroups = ['', '0', '-'];
+      const [, signBefore, absoluteValue, signAfter] = matchCharge('0-') || [];
+      expect([signBefore, absoluteValue, signAfter]).toEqual(
+        expectedMatchGroups,
+      );
+    });
+    it('should return expected matched array for string with two signs number', () => {
+      const expectedMatchGroups = ['-', '0', '-'];
+      const [, signBefore, absoluteValue, signAfter] = matchCharge('-0-') || [];
+      expect([signBefore, absoluteValue, signAfter]).toEqual(
+        expectedMatchGroups,
+      );
+    });
+    it('should return null for string with invalid number format', () => {
+      const result = matchCharge('--0');
+      expect(result).toBeNull();
+    });
+  });
+});
diff --git a/packages/ketcher-react/src/script/ui/data/utils.ts b/packages/ketcher-react/src/script/ui/data/utils.ts
new file mode 100644
index 0000000000..d44ec5b40a
--- /dev/null
+++ b/packages/ketcher-react/src/script/ui/data/utils.ts
@@ -0,0 +1,16 @@
+import { atom } from './schema/struct-schema';
+
+/**
+ * Get match groups from string representation of charge. It returns RegExpExecArray for charges with values +-[0..15]
+ * overwise returns null
+ *
+ * @example
+ * matchCharge("16") === null
+ * matchCharge("0") === []
+ * matchCharge("-1") === ["-1", "-", "1", ""]
+ * matchCharge("15+") === ["15+", "", "15", "+"]
+ */
+export function matchCharge(charge: string) {
+  const regex = new RegExp(atom.properties.charge.pattern);
+  return regex.exec(charge);
+}
diff --git a/packages/ketcher-react/src/script/ui/views/modal/components/toolbox/Atom/helper.ts b/packages/ketcher-react/src/script/ui/views/modal/components/toolbox/Atom/helper.ts
index 1180dcf189..8bcf58789f 100644
--- a/packages/ketcher-react/src/script/ui/views/modal/components/toolbox/Atom/helper.ts
+++ b/packages/ketcher-react/src/script/ui/views/modal/components/toolbox/Atom/helper.ts
@@ -1,6 +1,7 @@
 import { AtomType, Elements, genericsList } from 'ketcher-core';
 import { capitalize } from 'lodash';
 import { atom as atomSchema } from '../../../../../data/schema/struct-schema';
+import { matchCharge } from 'src/script/ui/data/utils';
 
 export function atomValid(
   label: string,
@@ -47,8 +48,7 @@ export function chargeValid(
   isMultipleAtoms: boolean,
   isCustomQuery: boolean,
 ) {
-  const regex = new RegExp(atomSchema.properties.charge.pattern);
-  const result = regex.exec(charge);
+  const result = matchCharge(charge);
   const isValidCharge = result && (result[1] === '' || result[3] === '');
   if (isCustomQuery || charge === '') {
     return true;