SOURCE: Can a lithium ion battery be overcharged?
Here's a small FAQ I found: 1) My lithium ion battery is the SONY NP-FP70 Battery Pack. Does the fact that the battery is called a battery pack mean that it has built in circuitry to prevent an overcharge? No. I write with some authority since I've dissected too many and there is no such circuit in the battery. From a system perspective it doesn't belong there. 2) Is there any way of knowing if my SONY BC-TRP charger has the circuitry for preventing an overcharge? You'll have to ask, but the key clues are: a. The documention tells you to not leave it plugged in overnight. b. The battery gets too hot and melts the plastic. 3) If I charge my battery in my camcorder (SONY DCR-HC40), can I assume it has the built in circuitry to prevent an overcharge? a. One can't assume anything. b. But from what I read on that model, you plug it in and forget about it. To do that, it would have a proper charge circuit.
SOURCE: Battery charger light flash
Its pretty simple to fix. The lithium battery has just depolarized. Just buy a 9V battery.... put them end to end... the 9V and the lithium and touch the metal parts of them. hold for 20 seconds... if it doesn't work, lick the 9V to conduct the electricity better.. hold for 20 seconds and put directly on the charger... I just did this, and it is charging as we speak! good luck!
SOURCE: Can the BC-NH01 battery charger also charge AAA
In reality, yes. The AAA batteries are to short for the charger, so some fiddling is required. I'd recommend you buy a suitable multicharger instead.
SOURCE: WHEN PLUG IN BC-45W CHARGER
Scrape any dirt from the contats of both the battery and the charger.
Check the wires and plug for any loose connection.
If it charges normally apart from the light, then the fault is only with the light.
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