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Oh - and as for the size of a larger battery - several forum members including myself have used larger cellphone batteries up to 1500mAH.
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You can just solder the wires directly to the + & - pins of the battery.? The IP5303 essentially charges the battery according to its instantaneous voltage instead of just pushing constant current into it, just like it would be charged in a cellphone - just don't use a really old cell for this. Any 18650 cell will be way more than enough for the nano's needs. On Thursday, November 14, 2019, 1:10:11 p.m. GMT-5, Larry Rothman <nlroth@...> wrote:
All lithium -cells- need to come with overcharge, overcurrent (ie:shorting its terminals), undervoltage and overtemp protection (and balancing sometimes is also built-in). And that is just that small board on the cell itself !?? The IP5303's charging circuit knows nothing about the physical condition of the Li cell.If the IP5303 fails catastrophically, you want the battery to protect itself. I have several two-way radio batteries that have disabled themselves due to a fault somewhere but when I opened them up, the individual cells were fine. I also have 3.6V cells where the protection module shut off the output voltage. I use those cells in other projects. Better safe than fire...... ? ? On Thursday, November 14, 2019, 12:45:10 p.m. GMT-5, Nick <g3vnc@...> wrote: I am currently repackaging my nvna and would like to include a (much) bigger battery. What is the biggest battery capacity (Amp-Hours) I could use with the IP5303 charging circuit?? Looks to me like there is no limit since the IP5303 will limit the charging current so the initial constant current phase of charging will simply take longer. Why does the? 450mAh battery supplied with the device include a built in circuit for over drain protection etc?? The IP5303 already has "Input over-voltage, over-current, battery over-charge, over-drain, over-current protection" built in. I'm thinking a fat cell phone Lithium Ion battery should be fine as reported by Larry Rothman here... /g/nanovna-users/photo/0/40?p=Created,,,20,1,40,0 (I was at a flea market a couple of months ago and there was a seller who had a lot of new cylindrical LiIon cells about 3Ah as I recall.? They were very cheap, but I did not have a nvna then.? I wish now that I had bought a few.) |
