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DCR-HC40W Sony battery charger is lithium ion charger.
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Sony DCR-HC40W Battery Charger Knowledge:
Q: Why is the battery 7.4V and the charger outputs 8.4V?
A: The charger is limited at 8.4V, but does not go to 8.4V immediately when the battery is just plugged in. It first charges the battery at a constant current until the voltage reaches 8.4V. Then, it stays at 8.4V for a few minutes. Then it shuts off and the LED turns green. This is according to Li-Ion charging specifications. It is different from Ni-MH or Ni-Cd battery charging. Read our FAQ for battery charging tips.
Q: Why would the LED turn red and immediately turn green with my battery?
A: Your battery is "dead". It has lost over 90% of its capacity. This usually happens when you overdischarge the battery too much. Read out FAQ for battery usabe tips. You need to get a new battery.
Q: The LED never turns red but my battery works. Is the charger bad?
A: There is a chance the battery terminals do not touch the charger contacts all the way or became dirty. Please, check that. If necessary clean the battery terminals or slightly bend the charger contacts to have a better connection. If this is not the case - then yes, the charger is bad. Generally, these chargers have a very low rate of returns. Less than one in 500.
Sony DCR-HC40W Battery Charger Caution:
Please pay attention to the battery plug's light "COLOR".
If the light has not changed to Red.The battery should not being charged.
Take off the charger at first and take out the battery if the battery should not being charged.
Don't leave the battery in the battery plug too long time after the battery is fully charged.
Keep out of the reach of children.
Don't disassemble or attempt to open the battery charger.