Mobile-terminal power supply

The invention discloses a mobile-terminal power supply, which comprises a lithium-ion battery pack and a DC-DC (Direct Current-Direct Current) booster, wherein the lithium-ion battery pack is formed by connecting a plurality of lithium-ion battery parallel packs in series, and each lithium-ion battery parallel pack comprises a plurality of lithium-ion batteries; a 28V direct-current voltage is provided for a mobile-terminal 10W power amplifier based on a Beidou satellite after the voltage output by the lithium-ion battery pack is boosted by the DC-DC booster; because the lithium-ion batteries have better capacity and volume ratios, the mobile-terminal power supply disclosed by the invention has the advantages of small size, light weight but long continuous usage time; and in addition, because a battery-monitoring circuit is added between the lithium-ion battery pack and the DC-DC booster, the charge and the discharge of the lithium-ion battery pack can be switched, the overcharge and the overdischarge of the lithium-ion batteries can be avoided, and the using period of the mobile-terminal power supply is improved.