can not use when charge time.

need to make IBVA power Switch OFF, then connect charger to make charge.

after full discharge will take around 6 hours to charge.

usually not use as full discharge, so charge time will be 2 to 3 hours.

after charge it, need to disconnect charger plug.

then connect headset cable and make IBVA power Switch ON to use it.

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after use IBVA ( what ever use time ) , then charge for next day use.

this is nice way to keep continue use IBVA.

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after full charge will work keep continue 8 hours. 

depend on brain power ( high brain power need more high power current ) will work 10 hours keep continue with new battery.

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charger has LED light. when charge :  "Red light", after finish charge : "Green light"

charger instruction is included. work with 100 V to 240 V 50 / 60 Hz.

IBVA need to use this charger. can not use other type of power.

in case use other power / charger then may cause damage of battery and IBVA.

IBVA unit LED is shows battery OK for IBVA.

charger LED is for charge process. Red is process to charge. Green is full charged.

need to make OFF SW IBVA when charge. so IBVA LED is OFF always when change.

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it is safety and AC noise reason , do not connect charger to IBVA when use it.

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I tested this new battery system over one year.

works very nice and easy. one year later still works over 8 to 10 hours keep continue.

Apple say new lap top works 8 hours, but some people test this then works 4 to 6 hours. depend on how to use.

IBVA need to use a lot of CPU and Graphic power. so i think works only 4 to 5 hours.

so it is very nice with new lap top mac.