![]() Is the cup of Ions actually necessary? I don't really understand it's function since it isn't connected to the battery in any way, but rather just sitting on the counter.ĭ. It is very mission critical, if the battery fails people may die, so it is important to include a margin of error.ī. How many oranges will I need to power my device for 72 hours continuously. My intention is to harvest oranges daily to keep my lithium ion batteries fresh and fully charged.Ī. I have heard that you can make a lithium ion battery by pushing a copper penny and a zinc nail in either side of a fresh orange, while a cup of ions sits nearby (as long as you've taken your daily dose of lithium. See the Tech Tips and Why Discharge? sections. This helps to restore the cell to close to its rated capacity and voltage (when being used).īoth NiCd and NiMh cells are susceptible to voltage depression, but NiCd more so. This is called "voltage depression" and is commonly attributed to "memory", but actually isn't.ĭischarging a cell completely (not to zero volts!) and recharging causes all of crystals to be reformed at their normal smaller size, increasing their surface area and lowering the internal resistance of the cell. This causes the voltage you measure at the cell terminals to be lower (when being used) and makes the cell seem to be discharged before it actually is. This higher internal resistance causes a voltage drop inside the cell. Since there are fewer crystals, there's less active surface area and higher internal resistance. However, several things can the internal chemical structure of a cell to form fewer, larger crystals. There is no "memory" in any cells or application you'll ever come across. If the label doesn't say so, charge them at 1C. Some newer LiPos can be charged at a higher rate, but their life may be shortened if you do that. LiPo also doesn't have a memory effect, and I would charge them at 1C rate (2.2A for your example) which should take about 75 minutes if they're fully discharged. ![]() 900mA charge rate for your example), depending on its physical size and type. You may be able to charge at up to 1C rate (i.e. ![]() I charge my small NiMh receiver and transmitter packs (1200mAh capacity) at somewhere around 1/10C overnight. NiMh doesn't have a memory effect, so cycling is not required so often, but I believe an occasional cycle can help keep the cells in balance. I'm not sure what discharge rate I use - my cycler sets it for me - but I think about twice the charge rate is usually recommended. 60mA in your example) for 14 hours or so. 3.6v for a 4-cell NiCd).įor a battery that small I would always charge it at about 1/10C (i.e. To get over this, you should from time to time (I used to do it every charge when I had NiCds) discharge it down to nominally empty, which in practice is generally regarded as being 0.9v per cell (i.e. That means that if, for instance, you keep recharging it when you've only used 10% of its capacity, it'll eventually "refuse" to go down below 90%. ![]()
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