Nikon MH-18a quick charger: fast-blinking light?

When I charged the battery at the beginning it was blinking slowly/normally. Then after 1/2 hour it stopped charging and started blinking very fast and the battery/charger were very hot. (my batteries are genuine EN-EL3a)
Please give me idea. What should i do?

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How to get PTP Mode on a Nikon D5100?

I have the Nikon D5100 I bought it about a month ago, i need to do some stop motion work for Media, and im working with a software called iStop Motion which requires me to set my camera into PTP more for a live feedback view on my Mac screen, how do i set up PTP mode on my camera? Thank you, also its an SLR if that you didn't know that already. Thanks

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