Use of rechargeable lithium battery-energy (or with lead-acid batteries) as a power source, charging once and it may contiguously work 6 ~ 8 hours charging time is 2-3 hours.

采用可充电高能锂电池（或背负式铅酸电池）作为动力源，充电一次可连续作业6~8小时，充电时间为2~3小时。

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Meanwhile, an average current mode controlled power source is used to provide constant charging current to these selected cells.

同时，一个平均电流模式控制的电流源被用来对选中的单体提供恒定的充电电流。

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This paper introduces a high-frequency series resonant charing method of solid pulsed laser power source, basing on constant current charging of digital control technology.

介绍了一种高频串联谐振充电的固体脉冲激光电源及其数字化控制恒流充电技术。

youdao

So provided that your speakers have their own power source, it's just a matter of charging these aluminum dongles up (a single charge lasts up to 10 hours), plugging them in and then pairing the right receiver with your audio source.

ENGADGET

Plugged into any AC power source from 100 to 240 volts, PowerBlock converts it to safe, efficient 10 watt charging for smartphones, tablets, and e-readers.

ENGADGET: Griffin launches PowerDock 5 multi-device charging platform and ChargeSensor adapters