<html class="apple-mail-supports-explicit-dark-mode"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Hi Jon</div><div dir="ltr"><br></div><div dir="ltr">It was an Amazon purchase:</div><div dir="ltr"><br></div><div dir="ltr"><h1 data-feature-name="title" data-template-name="title" class="a-size-small a-color-secondary a-text-normal" style="box-sizing: border-box; padding: 0px; margin: 0px; padding-block-end: 0px; text-rendering: optimizelegibility; font-family: "Amazon Ember", Arial, sans-serif; font-weight: var(--__SARCETZnk,400) !important; font-size: 1.4rem !important; line-height: 1.2858 !important; color: rgb(86, 89, 89);"><span id="title" class="a-size-small a-color-secondary" style="box-sizing: border-box; padding-block-end: 0px; font-size: 1.4rem !important; line-height: 1.2858 !important;">TYKOOL U1-S-400 Group U1 Lithium Lawn Mower Battery,400A 8AH, for John Deere,Cub Cadet,Craftsman Riding Mowers and Tractors,Smart BMS with SOC Display,IP66,V0 Fireproof,Replaces 725-1707D,U1-9 [+ -]</span></h1><div><span class="a-size-small a-color-secondary" style="box-sizing: border-box; padding-block-end: 0px; font-size: 1.4rem !important; line-height: 1.2858 !important;"><br></span></div><div><span class="a-size-small a-color-secondary" style="box-sizing: border-box; padding-block-end: 0px; font-size: 1.4rem !important; line-height: 1.2858 !important;">“</span><span style="caret-color: rgb(15, 17, 17); color: rgb(15, 17, 17); font-family: "Amazon Ember", Arial, sans-serif; background-color: rgb(255, 255, 255);"> Powered by automotive-grade LiFePO4 cells, the TYKOOL S-400 provides over 3,000 deep cycles. It is a cost-effective, long-term power solution that lasts up to 10X longer than traditional AGM batteries.”</span></div><div><span style="caret-color: rgb(15, 17, 17); color: rgb(15, 17, 17); font-family: "Amazon Ember", Arial, sans-serif; background-color: rgb(255, 255, 255);"><br></span></div><div><span style="caret-color: rgb(15, 17, 17); color: rgb(15, 17, 17); font-family: "Amazon Ember", Arial, sans-serif; background-color: rgb(255, 255, 255);">So I guess it was LiFePO4. </span></div><div><span style="caret-color: rgb(15, 17, 17); color: rgb(15, 17, 17); font-family: "Amazon Ember", Arial, sans-serif; background-color: rgb(255, 255, 255);"><br></span></div><div><span class="a-size-small a-color-secondary" style="box-sizing: border-box; padding-block-end: 0px; font-size: 1.4rem !important; line-height: 1.2858 !important;"><br></span></div><div><span class="a-size-small a-color-secondary" style="box-sizing: border-box; padding-block-end: 0px; font-size: 1.4rem !important; line-height: 1.2858 !important;"><br></span></div></div><div dir="ltr"><br><blockquote type="cite">On Jul 2, 2026, at 7:52 PM, Jon Wallace via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div class="ydpd932830yahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div></div>
<div dir="ltr" data-setdir="false">Interesting. Do you know if it was Li-ion or Lifepo4? A number of us have switched to Lifepo4 which are generally much safer than Li-ion.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Jon</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
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On Thursday, July 2, 2026 at 07:33:21 PM EDT, Gregory Snyder via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="ydp7f8c14a3yiv7799157853"><div><div dir="ltr"></div><div dir="ltr">Are lithium batteries safe? </div><div dir="ltr">I bought a lithium battery to use in my John Deere lawn tractor and it burst into flames when I parked it in the garage. Shooting up with billows of nasty smoke. Had I not been right there, it would have burned my garage down for sure. I had a fire extinguisher and was able to stop the bulk of the flames. Scared the crap out of me. </div><div dir="ltr">Not such a fan of lithium all of a sudden. </div><div dir="ltr">Can it be used in subs? </div><div dir="ltr"><br></div><div dir="ltr">Best regards</div><div dir="ltr">Greg </div><div dir="ltr"><br></div><div dir="ltr"><img alt="image0.jpeg" src="cid:XkYzDynnaxLblw5bPQFv"><br></div><div dir="ltr"><br></div><div dir="ltr"><br><blockquote type="cite">On Jul 2, 2026, at 12:52 PM, Jon Wallace via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div style="font-family:times new roman, new york, times, serif;font-size:16px;" class="ydp7f8c14a3yiv7799157853ydp5ae1b214yahoo-style-wrap"><div></div>
<div dir="ltr">I have not seen a "pack" replacement, but as Alec said, my units came with a generic 8-AA plastic battery holder with a 9-volt type wiring harness. Better off using this and AA lithium batteries that can be recharged via an external charger. Walmart has an 8-pack battery charger for $22.</div><div dir="ltr"><br></div><div dir="ltr">Jon</div><div dir="ltr"><br></div><div dir="ltr"><br></div><div><br></div>
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On Thursday, July 2, 2026 at 01:12:40 PM EDT, Justin Helland via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="ydp7f8c14a3yiv7799157853ydp1567db4ayiv9999143455"><div dir="ltr">Greetings! Have any of you found a decent off the shelf battery as a replacement for the OTS 12v NiMH battery in the SSB-2010? I could probably build one with spare cells I have lying around, but I was just wondering if there's anything out there that's cheaper than the $150 OTS wants for the official replacement. </div>
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