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Lithium batteries
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<blockquote data-quote="adulbrich" data-source="post: 8767153" data-attributes="member: 661255"><p>Ok, I was concerned about safety/longevity of the bank without balancing. I'm currently writing a research paper on microbattery technology, and some of the new lithium chemistries that perform great are unstable/dangerous. Not an ideal quality for powering wireless earbuds to say the least. I just started the paper two weeks ago, so I haven't dug into all the different lithium chemistries yet.</p><p></p><p>I know a decent bit about AGM batteries, but my knowledge of lithium cells is limited. I would like to know more. When you say 5S or 6S, does that mean a 5 cell bank or 6 cell bank?</p><p></p><p>The Lishen cells are rated at 15C/50C. 15C being the maximum recommended continuous pull (270A), and 50C being the absolute maximum rated draw (900A). The Wilson Audio Labs test showed the smart 3 drawing 277A at 1 ohm, 288A at 1.3 ohms, and 334A at 2 ohms. After watching the video, I definitely learned a lot about the smart 3, assuming their information is accurate. If I'm wired to 1 ohm nominal, my minimal box rise *may* be somewhere around 1.3 ohms. I know there are a TON of factors with this, and it is theoretically possible my minimum box rise could be around 2 ohms. The amp establishes a maximum voltage output based on the load, and isn't "constantly correcting" (making a constant power over a range of impedance) like I had incorrectly assumed it would do.</p><p></p><p>That being said, if we assume the amp draws 300A for extended durations of time, it's a bit out of the comfort range of one bank. If I add a second bank, it should be well within the usable daily range, even factoring in the 4 channel amp and vehicle's draw. My stock alt is something like 75A. I'm thinking about trying 2 banks on the stock alt first, and then deciding between the 240A and 300A alt based on voltage drop severity. Likely, I'll end up going with the 300A, because I don't like to skimp.</p><p></p><p>I'd like to test my skills with the bus bars. I have some mill bits for my drill press at home. Otherwise, I have access to the metal fabrication shop on campus. As long as I'm bringing in my own aluminum stock, I can work on personal projects. Worst case, they turn out bad and I have the local metal shop (which I know the owner of) make some bus bars with the remaining aluminum bars I haven't messed up, haha. Otherwise, I saw some for sale online.</p><p></p><p>Thanks! I wouldn't say I'm staying out of trouble completely, but I'm still kickin'. I bought my first house in 2019. I had my uncle who is a partner at a construction company check it out. It's solid, and not a fixer-upper. 2 bed, one bath. Single car detached garage with a huge fenced in backyard that has a gate for alley access. Had a new roof put on a month before I bought it. I ordered new windows in August, and they just arrived last weekend. Going to install the new windows before I get too far on this build. Based on my last 2 years' financial statements, I could pay off my house in under 4 years if I don't change my spending habits too much after starting the new job. Life isn't all good, but I know it could be worse. One thing I've learned in life so far is that things can always get worse.</p><p></p><p>I appreciate the time you're taking to advise me about the batteries. Thanks</p></blockquote><p></p>
[QUOTE="adulbrich, post: 8767153, member: 661255"] Ok, I was concerned about safety/longevity of the bank without balancing. I'm currently writing a research paper on microbattery technology, and some of the new lithium chemistries that perform great are unstable/dangerous. Not an ideal quality for powering wireless earbuds to say the least. I just started the paper two weeks ago, so I haven't dug into all the different lithium chemistries yet. I know a decent bit about AGM batteries, but my knowledge of lithium cells is limited. I would like to know more. When you say 5S or 6S, does that mean a 5 cell bank or 6 cell bank? The Lishen cells are rated at 15C/50C. 15C being the maximum recommended continuous pull (270A), and 50C being the absolute maximum rated draw (900A). The Wilson Audio Labs test showed the smart 3 drawing 277A at 1 ohm, 288A at 1.3 ohms, and 334A at 2 ohms. After watching the video, I definitely learned a lot about the smart 3, assuming their information is accurate. If I'm wired to 1 ohm nominal, my minimal box rise *may* be somewhere around 1.3 ohms. I know there are a TON of factors with this, and it is theoretically possible my minimum box rise could be around 2 ohms. The amp establishes a maximum voltage output based on the load, and isn't "constantly correcting" (making a constant power over a range of impedance) like I had incorrectly assumed it would do. That being said, if we assume the amp draws 300A for extended durations of time, it's a bit out of the comfort range of one bank. If I add a second bank, it should be well within the usable daily range, even factoring in the 4 channel amp and vehicle's draw. My stock alt is something like 75A. I'm thinking about trying 2 banks on the stock alt first, and then deciding between the 240A and 300A alt based on voltage drop severity. Likely, I'll end up going with the 300A, because I don't like to skimp. I'd like to test my skills with the bus bars. I have some mill bits for my drill press at home. Otherwise, I have access to the metal fabrication shop on campus. As long as I'm bringing in my own aluminum stock, I can work on personal projects. Worst case, they turn out bad and I have the local metal shop (which I know the owner of) make some bus bars with the remaining aluminum bars I haven't messed up, haha. Otherwise, I saw some for sale online. Thanks! I wouldn't say I'm staying out of trouble completely, but I'm still kickin'. I bought my first house in 2019. I had my uncle who is a partner at a construction company check it out. It's solid, and not a fixer-upper. 2 bed, one bath. Single car detached garage with a huge fenced in backyard that has a gate for alley access. Had a new roof put on a month before I bought it. I ordered new windows in August, and they just arrived last weekend. Going to install the new windows before I get too far on this build. Based on my last 2 years' financial statements, I could pay off my house in under 4 years if I don't change my spending habits too much after starting the new job. Life isn't all good, but I know it could be worse. One thing I've learned in life so far is that things can always get worse. I appreciate the time you're taking to advise me about the batteries. Thanks [/QUOTE]
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