It seems valid, but we must take account of the charge time

It seems valid, but we must take account of the charge time

New - 4in1 Charger + 2x Battery NP-F970 as NPF970 for Sony Camcorder Sony CCD-TR Series | CCD-TRV Series | Sony DCR-TR Series | Sony DCS-CD | Sony MVC-FD Series and much more ... ( electronic devices)
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Customer Review

I bought this kit to feed the fire of Yongnuo YN-300 LED projectors.
From an initial test, a battery charge lasts at least three hours at maximum power.
In this kit, however, there is no proportion between the capacity of the battery and charger.
Batteries are 7.2V 6900mAh. The charger 300mA load. To fully charge an empty battery takes longer than 20 hours.
I take a second spot, but if I download the two batteries, it takes two days to recharge.
it is that this charger will work powered by a USB port or powered 12V (car), or AC power, but must consider the charging time and perhaps consider a second charger.

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