[pjphilli (Peter)]

Hi

With the old NiCad portable batteries we learned that the battery should be fully discharged before recharging because of "memory effect" of charging a partly discharged batterty.

I am wondering what charging procedures apply to modern batteries such as NiMH and Lithium Ion?

For instance, when at home I usually let my IPad (Lithium Ion) battery
fully or near fully discharge before completely recharging. However, when I take it out I like to top up the partly discharged battery so that the IPad keeps working for the entire outing. I see that Apple advises letting the IPad battery discharge fully and then recharge at least once a month.

So is there a problem (or "memory effect) with battery life if NiMH or Lithium Ion batteries are recharged when not fully discharged?

Cheers Peter