bought a mk3 a few months ago now, it was shooting fine, then I got the one shot then bleep, battery low, so connected the charger but nothing in the safety mode, turn it off the safe mode I got the beep and flashing light, but after a while I got a faint fast beeps, battery not charging, so got my self a new battery from daystate thinking the old one was dud, gun shooting fine then the one shot beep, battery low, so on charge but the same happened again, read all through the internet, I get the impression my main board is faulty,£200-£300 to replace, so I adapted the battey so I can charge it