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battery life depends on 2 things
the amount of time you spend on the phone and the number of apps you are running
and the level of charge at which you recharge the phone
Recent questions put to a phone repair shop got the answer that 3 days from a fully charged battery was exceptional as most only do 1 day on normal use and less if watching live streaming
as to the level at recharge , batteries have a habit of developing a level memory and will not charge past that point
So if you continually recharge at almost flat, and allow for a full recharge , you get full battery life
at the other end of the period , if you recharge at say 75% charge , the battery memory starts and then it doesn't matter how long you charge the battery for , it will only charge 25% which means you wind up with a flat battery more often
so how to overcome the problem---the more you use it the quicker the battery runs down and when recharging always allow the battery to be less than 5% charge before recharging it ( dead flat is best) and leave it on charge for the max amount of time ( overnight is best)
funny thing with batteries is that they can get a memory = sounds stupid yes = if a battery is recharged when it has half charge and then fully charged it remembers the point , one it gains memory it wont charge past the last point = or the battery life is over = or the charger is faulty.
Sadly that's how they make the new rechargable batteries for controllers. You are supposed to recycle that and buy new. Luckily you can find chargers for the wii very cheap nowadays. I have used a few different chargers and have found the Nyko brand ones are junk so steer clear of those. The Duracell induction chargers however work very nicely. You just set the wii remote down on the charge pad and it charges fairly quickly. My kids run around and even if the remote shifts a bit it will continue charging. Hope this helps!
All batteries will eventually fail to hold a charge. The battery chemistry and how you charge it can change how long the battery will last. The DMC-FS4 has a Lithium-ion battery so it shouldn't have as much of the memory issue of older rechargeable batteries. (This is the "you routinely recharge the battery when it's at 50% then it always stops working at 50% charge" problem.)
How old is your battery? Eventually you will need a new battery but the time to replacement will depend on the number of recharge cycles. With a Li-ion battery, I'd expect several thousand recharges before failure. Temperature and usage will effect this. The battery does lose charge even when not used.
Be careful, some versions of the firmware look for Panasonic's specific batteries or a "that match the Panasonic rigorous specs".
I've seen a few devices where the charger failed before the battery. If a new battery doesn't seem to be charging, replace the charger. I hope this helps.
Your battery has probably just reached the end of it's service life, or developed a memory after repeated chargeings without being fully depleted. All rechargeable batteries have an average maximum number of duty cycles. (drain and charge) If your charger has a deep cycle feature, try using this to completely drain and recharge the battery. If it doesn't, try putting it in your trimmer and locking the trigger back for a few hours, then recharge it. If neither of these work, it's time for a new battery. If you do get a new battery, be sure to COMPLETELY drain the battery before recharging by locking the trigger back every few uses to avoid developing a memory and help extend the life of your new battery.
The plastic connecton has a coil in it, much like how a transformer is done. If you read up on how a transformer works its pretty much the same principle as it works on Induction. There is a coil and core iron in the end of the toothbrush and in the base, this creates AC current which inturn causes induction to flow through the coils and charge the battery. And about the reason why it is not charging is probably down to the battery being flat ( happens even when new ) or there is a loose connection when it was being transported.
Hope this helps.
I know this is an old post, and you likely don't need the answer anymore, but It appears that the programming in the induction pad can get screwed up and it won't actually detect that the batteries are there. By unplugging the station and leaving it unplugged for a bit, then plugging it back in you can normally reset the pad and get it to detect (and charge) the batteries again.