I wrote earlier about having a cellphone battery that always died and how I lucked out when I looked into replacing it. Here is another tip I just picked up.
I used to let my cellphone batteries drain completely before charging them. I was told the last time I bought a cellphone that that is not necessary anymore, but I continued to do it anyway, just to be safe. I figured it couldn’t hurt.
Well, apparently, it CAN hurt!
This source says that lithium-ion batteries should *not* be discharged fully on a regular basis.
Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.) Short battery life in a laptop is mainly cause by heat rather than charge/discharge patterns.
So, it seems that I probably contributed to the short life of my last two batteries (not including the defective one) by following the same rules as for nickel-based batteries. From now on, I will not let the battery run out completely before charging it. Also, I will try not to leave my cellphone in a place where it will get too hot. Let’s hope that leads to a more reasonable lifespan for my cellphone
batteries from now on!