Mobilo/smartphonu Li-ion akumulatori nemaz nav tik droši, kā varētu likties. To "nedrošums" ir saistīts ar pārāk ilgu turēšanu pie lādētāja pēc to pilnīgas uzlādes. Vispār ieteicams lādēšanas laikā ierīci izslēgt, kā arī mēģināt nelādēt līdz 100% un, piemēram, sasniedzot 95% līmeni, atslēgt no lādētāja.

Li-ion cannot absorb overcharge, and when fully charged the charge current must be cut off. A continuous trickle charge would cause plating of metallic lithium, and this could compromise safety. To minimize stress, keep the lithium-ion battery at the 4.20V/cell peak voltage as short a time as possible.

Lithium-ion operates safely within the designated operating voltages; however, the battery becomes unstable if inadvertently charged to a higher than specified voltage. Prolonged charging above 4.30V forms plating of metallic lithium on the anode, while the cathode material becomes an oxidizing agent, loses stability and produces carbon dioxide (CO₂). The cell pressure rises, and if charging is allowed to continue the current interrupt device (CID) responsible for cell safety disconnects the current at 1,380kPa (200psi).

Should the pressure rise further, a safety membrane bursts open at 3,450kPa (500psi) and the cell might eventually vent with flame. The thermal runaway moves lower when the battery is fully charged; ...

Vairāk informācijas te: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries