I bought a used 1D mkiv from Adorama just recently and with it came some cheap charger and a "Flashpoint" battery. When I first charged the battery, it would go from 30% to 100% charge in about 30min and I could get a little over 100 shots out of it. Now it's even worse, it will say full charge on the charger in 1min and I have maybe 5min of battery life. Camera says the recharge performance is Maximum with 3 green rectangles. Is there anyway to get this battery to work or is it shot? I already contacted Adorama and they are sending me a Canon battery for free. Which is nice, though I would like the Canon charger as well.