Geebax
Captain
Australia
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A higher discharge rate uses the chemical reaction that a battery is designed to utilise, whereas a very low discharge rate is not considered by the battery to be doing any useful work, akin to tickling it. It is a universal fact that batteries of all types like to be worked, not necessarily hard but worked nonetheless.
In a LiPo pack used by the RC guys, it is normal to bring out connections to the outside world from each cell. This allows charge balancing, and just as important, it allows you to monitor the discharge of each cell individually. When discharging, it is ideal to discharge each cell individually to around 0.5volts, but in a pack like the DJI Intelligent battery, all of that is supposed to be taken care of internally, so the individual cell connections are not brought out, just the main power and a serial communications connection.
If a LiPo pack is discharged too far, one cell may reach zero volts first, and if you continue to discharge the pack, that cell is driven into negative charge, which is damaging to the cell. Therefore, the safe route for DJI packs is to recommend a safe battery level that hopefully does not drive any cell into negative charge. Provided the cells are reasonably closely matched, 10% might be considered reasonably safe. |
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