<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:c45abef3-9da8-407b-9b89-65ec24ee0210,g:77164fbc-076d-4c2e-9df3-640596240e22-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://eosenergystorage.com/role/Cover" xlink:type="simple" xlink:href="eose-20240501.xsd#Cover"/>
  <link:definitionLink xlink:role="http://eosenergystorage.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_f184cb39-e249-4e2e-8adf-a2f6ee46cc36" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_DocumentInformationTable_f184cb39-e249-4e2e-8adf-a2f6ee46cc36" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1b183e70-91b9-4268-984e-4abd7dad9e88" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_f184cb39-e249-4e2e-8adf-a2f6ee46cc36" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1b183e70-91b9-4268-984e-4abd7dad9e88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1b183e70-91b9-4268-984e-4abd7dad9e88_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1b183e70-91b9-4268-984e-4abd7dad9e88" xlink:to="loc_us-gaap_ClassOfStockDomain_1b183e70-91b9-4268-984e-4abd7dad9e88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_71f1897f-5e8a-43f3-8d78-fc738cdc7555" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1b183e70-91b9-4268-984e-4abd7dad9e88" xlink:to="loc_us-gaap_ClassOfStockDomain_71f1897f-5e8a-43f3-8d78-fc738cdc7555" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_88254cff-41c8-4c5b-bc7a-e6981a16a0e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_71f1897f-5e8a-43f3-8d78-fc738cdc7555" xlink:to="loc_us-gaap_CommonStockMember_88254cff-41c8-4c5b-bc7a-e6981a16a0e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_e81eb5d2-4b0f-4fed-95df-d75df7b7126c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_71f1897f-5e8a-43f3-8d78-fc738cdc7555" xlink:to="loc_us-gaap_WarrantMember_e81eb5d2-4b0f-4fed-95df-d75df7b7126c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_65fced45-c43e-4223-b137-fda2a4ff97d0" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityRegistrantName_65fced45-c43e-4223-b137-fda2a4ff97d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_d3806497-64a4-4e3b-96a8-84c06b49a7de" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityCentralIndexKey_d3806497-64a4-4e3b-96a8-84c06b49a7de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_050ad614-d3e0-415a-8551-d768244a858b" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_AmendmentFlag_050ad614-d3e0-415a-8551-d768244a858b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_542a5d40-72c6-4ad7-8186-10e34843d532" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityEmergingGrowthCompany_542a5d40-72c6-4ad7-8186-10e34843d532" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_21b2519b-60cd-424e-93b8-fc4d6392478b" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_Security12bTitle_21b2519b-60cd-424e-93b8-fc4d6392478b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_f5f13d10-a328-46fb-b8f2-0d72b2bbd80b" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_TradingSymbol_f5f13d10-a328-46fb-b8f2-0d72b2bbd80b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_f816edbc-bcdc-438b-a365-7f4bece0beeb" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_SecurityExchangeName_f816edbc-bcdc-438b-a365-7f4bece0beeb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_4a4e0a0b-28fd-4df8-8bca-752c8017b2f7" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityFileNumber_4a4e0a0b-28fd-4df8-8bca-752c8017b2f7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_fbb88809-3764-40b1-9583-ff35eab52486" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityTaxIdentificationNumber_fbb88809-3764-40b1-9583-ff35eab52486" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_4c381dbd-0b02-4e66-8fbe-8634e632b11f" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityIncorporationStateCountryCode_4c381dbd-0b02-4e66-8fbe-8634e632b11f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_f81ef056-19b5-46bb-a0f0-2c6bed42343c" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityAddressAddressLine1_f81ef056-19b5-46bb-a0f0-2c6bed42343c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_4e4593ed-2430-4e7c-88ba-da854469378e" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityAddressCityOrTown_4e4593ed-2430-4e7c-88ba-da854469378e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_f4175521-8b2e-4c0f-a634-eb9aef40f912" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityAddressStateOrProvince_f4175521-8b2e-4c0f-a634-eb9aef40f912" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_d2ae15eb-bd62-4106-998f-496e091ace3b" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_EntityAddressPostalZipCode_d2ae15eb-bd62-4106-998f-496e091ace3b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_df0edd53-33a0-4a99-8563-efe56f83968c" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_CityAreaCode_df0edd53-33a0-4a99-8563-efe56f83968c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_fe486d3b-2740-49d2-855b-73603fa562b6" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_LocalPhoneNumber_fe486d3b-2740-49d2-855b-73603fa562b6" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_74798453-f947-414e-94c4-17e383b9cc9f" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_WrittenCommunications_74798453-f947-414e-94c4-17e383b9cc9f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_1ca57772-b1c1-4b59-9df3-fec8c3b1aa2a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_SolicitingMaterial_1ca57772-b1c1-4b59-9df3-fec8c3b1aa2a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_8059e3cb-2770-4fe5-9e97-6b08d19a4aab" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_PreCommencementTenderOffer_8059e3cb-2770-4fe5-9e97-6b08d19a4aab" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_74b91e88-184b-4301-8c0f-5db9897d62b5" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_8820e852-d20d-4e5c-836c-f78c06d0abf3" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_74b91e88-184b-4301-8c0f-5db9897d62b5" xlink:type="arc" order="19"/>
  </link:definitionLink>
</link:linkbase>
