I am designing a custom PCM (protection circuit module) for Li-ion cells provided by a supplier ( they offer PCMs but they do not meet our RF immunity spec ). The supplier-provided PCMs have a charge / discharge limit set for 1.7A - 4A for a 240mAh battery and a 4A - 8A limit for a 1800mAh battery. Now these limits seem huge to me, so I'm wondering what a more reasonable charge discharge current is where you could still get reasonably high instantaneous current without damaging the cells.
Since the 240mAh battery is used for a BLE (Bluetooth Low-Energy) device, I doubt it will ever see more than 50mA peak. Right now I'm thinking of setting the battery protection IC to limit charge / discharge at max ~500mA current.
For the 1800mAh hour battery, I am considering a max limit of 3A. Expected peak current from this battery would be about 2A.
Are there commonly used guidelines for the Li-ion cell capacity and charge / discharge current limits or are they totally application dependent? From my search, PCM current limits vary wildly so I am curious to know what (if any) standards exist.