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A polymer lithium ion battery is rated at 3.7v, 6600mAh and a maximum discharge current is specified at 3.3A. I take it this means the battery can be discharged at 3.3A and last for two hours since 6.6Ah/3.3A = 2 hours.

However, in addition to the above specifications, the battery has a nominal capacity of 6600mAh at 0.2C discharge. How does this extra bit of information affect my above calculation? I.e. How will it affect the battery life for a given current draw?

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What the extra bit of information means is that to realize the full 6600mAh capacity of the battery you would have to limit the discharge rate to 1320mA. That gives a typical usage time of 5 hours at that load.

When you increase the discharge rate you will change several things.

  • Battery cell temperature
  • Total realized capacity
  • Overall lifetime of the battery
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  • \$\begingroup\$ A 0.2C discharge is a standardized condition for capacity estimation tests (see for example the IEC 61960-3). \$\endgroup\$
    – Diego
    Commented Apr 12, 2022 at 6:23

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