Editing Deep Cycle Systems

{{CompanyCargo
|Description=Australian battery maker sued a YouTuber for defamation over honest reviews; court found DCS had no standing, DCS refuses to pay costs
|Founded=2016
|Industry=Batteries,Energy storage
|Logo=DeepCycleSystems.png
|ParentCompany=
|CompanyAlias=DCS
|Type=Private
|Website=https://deepcyclesystems.com.au/
}}

{{Hatnote|This article is about the battery manufacturer. For other uses, see [[DCS (disambiguation)]].}}

'''Deep Cycle Systems''' (DCS) is an Australian manufacturer of lithium iron phosphate (LFP) batteries for off-road, marine, solar, & recreational vehicle use. The company is notable for suing independent YouTuber Stephan Fischer for [[defamation]] after he published reviews documenting battery degradation & misleading warranty changes; the District Court of Queensland ruled that DCS had no standing to bring the claim.<ref name="judgment">{{Cite web |author=Byrne KC DCJ |title=Deep Cycle Systems Pty Ltd v Fischer [2025] QDC 25 |url=https://www.queenslandjudgments.com.au/caselaw/qdc/2025/25 |website=Queensland Judgments |date=11 Mar 2025 |access-date=28 Mar 2026}}</ref> Independent testing by the ARENA-funded Canberra Battery Test Centre found a DCS battery dropped to 57% state of health after roughly 1,100 cycles.<ref name="arena">{{Cite web |author=ARENA |title=Public Report 12 (Final Report) - Lithium-ion Battery Testing |url=https://arena.gov.au/assets/2018/05/lithium-ion-battery-testing-public-report-12.pdf |website=ARENA |date=Mar 2022 |access-date=28 Mar 2026 |url-status=live |archive-url=https://web.archive.org/web/20230428135852/https://arena.gov.au/assets/2018/05/lithium-ion-battery-testing-public-report-12.pdf |archive-date=28 Apr 2023 |format=pdf}}</ref>

DCS Pty Ltd (ABN 63 611 396 591) has been active on the Australian Business Register since 1 January 2017.<ref name="abr">{{Cite web |title=ABN Lookup - Deep Cycle Systems Pty Ltd |url=https://abr.business.gov.au/ABN/View/63611396591 |website=Australian Business Register |access-date=28 Mar 2026}}</ref> The sole director, Marek Tomolowicz, is also the sole director of Energy Tech Electronics Pty Ltd & Tomprop Pty Ltd.<ref name="judgment" /> The company manufactures batteries, battery management systems (BMS), cell management systems, DC-DC charging systems, & solar regulators.<ref name="dcs-about">{{Cite web |title=About Us |url=https://www.deepcyclesystems.com.au/about-us/ |website=Deep Cycle Systems |access-date=28 Mar 2026}}</ref>

==Consumer impact summary==
*DCS sued a small YouTuber for defamation over accurate product reviews, then refused to pay court-ordered costs after losing.<ref name="judgment" />
*Government-funded testing found a DCS battery dropped to 57% state of health after roughly 1,100 cycles & could not sustain discharge at its rated output.<ref name="arena" /><ref name="choice">{{Cite web |title=Solar battery trial |url=https://www.choice.com.au/home-improvement/energy-saving/solar/articles/solar-battery-trial |website=Choice |date=19 Apr 2024 |access-date=28 Mar 2026}}</ref>
*DCS changed its warranty terms to weaken capacity thresholds for engine bay installations without updating the "last updated" date, creating the appearance that the weaker terms had been in place since 2021.<ref name="car expert">{{Cite web |last=Maric |first=Paul |title=DCS batteries suing YouTuber for 'honest' review sets scary precedent |url=https://www.carexpert.com.au/opinion/dcs-batteries-suing-youtuber-for-honest-review-sets-scary-precedent |website=CarExpert |date=14 Aug 2024 |access-date=28 Mar 2026 |url-status=live |archive-url=https://web.archive.org/web/20240814023810/https://www.carexpert.com.au/opinion/dcs-batteries-suing-youtuber-for-honest-review-sets-scary-precedent |archive-date=14 Aug 2024}}</ref>
*ProductReview.com.au detected & removed suspected fake positive reviews from DCS's listing; the company holds a 1.4 out of 5 star rating from 14 verified reviews.<ref name="productreview">{{Cite web |title=Deep Cycle Systems (DCS) Reviews |url=https://www.productreview.com.au/listings/deep-cycle-systems-dcs |website=ProductReview.com.au |access-date=28 Mar 2026 |url-status=live |archive-url=https://web.archive.org/web/20251214235325/https://www.productreview.com.au/listings/deep-cycle-systems-dcs |archive-date=14 Dec 2025}}</ref>
*DCS submitted a complaint to the Australian Parliament's Joint Select Committee on Social Media accusing unnamed parties of "orchestrated cyberbullying" via YouTube.<ref name="parliament">{{Cite web |title=Submission 214 - Deep Cycle Systems |url=https://www.aph.gov.au/DocumentStore.ashx?id=df88fdde-8cd6-4537-84d7-683239f1a935&subId=763310 |website=Parliament of Australia |date=14 Aug 2024 |access-date=28 Mar 2026 |format=pdf}}</ref>

==Incidents==

===Defamation lawsuit against YouTuber===
{{Main|DCS sues small YouTuber for accurate product review showing battery issues & misleading warranty}}

On 2 May 2024, DCS filed a defamation lawsuit against Stephan Fischer, the creator of AllOffroad 4x4 Adventures TV, in the District Court of Queensland. Fischer had published video reviews between August & December 2023 documenting battery degradation & warranty discrepancies.<ref name="judgment" /> The District Court ruled against DCS on 11 March 2025, finding that DCS was not an "excluded corporation" under section 9 of the ''Defamation Act 2005'' (Qld) & therefore had no standing to sue for defamation. The court found DCS failed on both the employee count test & the associated entity test, citing financial intermingling between DCS & Energy Tech Electronics.<ref name="judgment" />

DCS refused to pay Fischer's court-ordered legal costs. Fischer served a statutory demand, which DCS ignored, & is pursuing a Federal Court winding-up application to force recovery.<ref name="gofundme">{{Cite web |last=Fischer |first=Stephan |title=Help Fight for Truth in YouTube Reviews |url=https://www.gofundme.com/f/help-fight-for-truth-in-youtube-reviews |website=GoFundMe |access-date=28 Mar 2026 |url-status=live |archive-url=http://web.archive.org/web/20251102145025/https://www.gofundme.com/f/help-fight-for-truth-in-youtube-reviews |archive-date=2 Nov 2025}}</ref>

===Battery degradation in government testing===
The ARENA-funded Canberra Battery Test Centre (run by ITP Renewables) tested DCS's PV 10.0 battery as part of an independent lithium-ion battery testing program. The DCS battery reached a state of health of approximately 57% after roughly 1,100 cycles & could not sustain discharge at its rated C3 rate.<ref name="arena" /> Consumer watchdog Choice reported the battery "rapidly declined in capacity" near the end of the trial in 2022.<ref name="choice" /> SolarQuotes noted that DCS's battery discharge rate was "much lower than it should be" & that the unit "will shut down well before it runs out of available stored energy."<ref name="solarquotes">{{Cite web |title=Battery Test Centre Reports |url=https://www.solarquotes.com.au/blog/battery-test-centre-reports/ |website=SolarQuotes |date=22 Feb 2021 |access-date=28 Mar 2026}}</ref>

===Hidden warranty policy update===
DCS's warranty page claims a "last updated" date of June 2021, but National Library of Australia web archives show the terms changed between March & November 2023. The March 2023 policy set the defective battery threshold at 80% of rated capacity for all installations. By November 2023, a new clause reduced the threshold to 70% for engine bay installations, weakening protections for those customers without updating the displayed policy date.<ref name="warranty-mar">{{Cite web |title=DCS Warranty, Shipping & Return Policies |url=https://www.deepcyclesystems.com.au/shipping-return-policy/ |website=DCS |url-status=dead |archive-url=https://webarchive.nla.gov.au/awa/20230309064156/https://www.deepcyclesystems.com.au/shipping-return-policy/ |archive-date=9 Mar 2023}}</ref><ref name="warranty-nov">{{Cite web |title=DCS Warranty, Shipping & Return Policies |url=https://www.deepcyclesystems.com.au/shipping-return-policy/ |website=DCS |url-status=live |archive-url=https://webarchive.nla.gov.au/awa/20231107111343/https://www.deepcyclesystems.com.au/shipping-return-policy/ |archive-date=7 Nov 2023}}</ref>

===Suspected fake positive reviews===
ProductReview.com.au placed a warning on DCS's listing stating they had "detected a number of positive reviews for this listing which we suspect have been falsely generated." The suspected fake reviews were removed.<ref name="productreview" /> Following the purge, DCS holds a 1.4 out of 5 star rating based on 14 verified reviews, with 93% rated negative.<ref name="productreview" />

===Parliamentary submission on cyberbullying===
On 14 August 2024, DCS submitted a document to the Australian Parliament's Joint Select Committee on Social Media & Australian Society (Submission 214). The submission described DCS as the target of an "orchestrated cyberbullying attack via YouTube since September 2023" based on "one person's opinion and supported by a group of online followers," claiming the campaign was "used to discredit the quality of our products" & had caused "millions of dollars" of damage.<ref name="parliament" /> The submission did not name any individual by name.

===Reported battery fire===
A consumer on ProductReview.com.au reported that on 24 August 2023, a DCS battery installed in a Holden Commodore exploded & caught fire. CarExpert noted the review came from a "verified" purchase but stated "there's no way for us to verify the validity of this story."<ref name="car expert" />

==See also==
*[[Vulcan Strength]]

==References==
{{Reflist}}

[[Category:Deep Cycle Systems]]
[[Category:Companies]]