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The main advantage is that you only need the one charger to charge the two different voltage batteries which makes the job a lost simpler if you have to get your charger PAT tested before use on site.
It charges the batteries on a first come first charge basis, so the first battery inserted will be the first to charge.
The unit can charge a 3ah battery in approximately 60 minutes and a 1.5ah battery in approximately 30 minutes.
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- Pro Carpenter
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the batteries are 10.8 and 18v as in 3x 3.6v =10.8 and 3.6 x5=18v
a rechargable battery will start around 20% overvolt and go flat about 15% below
so 10.8 will start around 13v and finnish around 9v
a 18v will start around 21.5v and finnish around 15v
so the industry standard is the mid point so 3.6v per cell