Vaping has helped make LiIon cells a bit more accessible. You don’t have to look for “genuine” cells, third-party cells with good reviews are a decent source and tend to provide more value per dollar, but bottom-of-the-barrel cells are likely to disappoint. I first encountered it when I saw pictures of a Chinese radio using Nokia format batteries, and I’ve been designing them into small-scale stuff ever since. We’ve seen this done with iPhone batteries, and we’ve also seen things like makeshift pin header-based holders for smartphone cells. One small thing to keep in mind – while older Nokia batteries have a third pin, it’s not a thermistor pin – instead, it’s a fixed-value cell identification resistor. Most importantly, you get a battery with an active supply chain, which means you can design it into your project mechanically and electrically, and not fear a redesign a few months in when all local stock of a very specific cell suddenly runs out. With a smartphone cell, you get a protection circuit, usually a built-in thermistor and often a one-wire or I2C fuel gauge. You can source these contacts from online repair shops, LCSC, Aliexpress and probably more. If you’d like to make your device repeatable by others and make battery sourcing simple, perhaps work around LiIon shipping restrictions, or if you’re a garage startup itching to get a small prototype batch out of the door, smartphone batteries are a good bet.Įven more, there’s not much preventing you from putting the same contacts used by phones onto your PCB. However, shopping for smartphone batteries in your local stores is still worthwhile if you need a small cell to power your device.įor instance, user-replaceable batteries are still manufactured and sold for numpad phones from manufacturers like Nokia, with cells typically around 1000 mAh, more than enough for a small ESP32 or Pi Pico project that spends lots of time asleep. Of course, we’ve all seen a phone battery die earlier than the phone did, and in many modern phones, the cell is glued-in and harder to extract. Smartphone Batteries A Viable Source A radio rebuild project using a Nokia batteryįirst underappreciated source of LiIon cells, specifically pouch cells, are smartphone batteries. Let’s see what your options are beyond laptops. However, a 18650 cell might not fit your project size-wise, and thin batteries haven’t quite flooded the market yet.
Taking laptop batteries apart, whether the regular 18650 or the modern pouch cell-based ones, remains a good avenue – many hackers take this road and the topic is extensively covered by a number of people. But what if you don’t have any LiIon cells yet? Where do you get LiIon cells for your project? original sound - City Music Melaka.In the first article, I’ve given you an overview of Lithium-Ion batteries and cells as building blocks for our projects, and described how hackers should treat their Lithium-Ion cells.
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