There is no charging of the battery
The batteries do not get soldered on model 5414 they snap in and out but disassembly is tricky. 
SOURCE: Braun electric shaver will not charge.
Your batteries are no longer capable of being recharged and need to be replaced.
If you are handy and can dissemble and solder, you can do this yourself, otherwise, you can send it off to a repair service that will do this for you.
If you wish to do this yourself, you'll have to take the shaver apart. There are two (2) small plastic caps on the bottom of the shaver that can be removed with a small pick or flatbladed screwdriver. Once those are out, you can unscrew the two screws that hold the shaver together and gently pry off the side panels.
This will expose the internal circuit board and the rechargable batteries that need to be unsolded. You can then reinstall NEW rechargable batteries and solder them onto the PCB (printed circuit board). You can also purchase a complete internal PCB with the batteries and everything you need, you just swap out the electronics for the new one, although this costs about $39, while the batteries alone are much less.
Put the shell together and reinstall the retaining screws and caps and you're done.
Here's a link to get the replacement batteries for your shaver. They also do the repair service, if you don't want to do it yourself.
http://www.electricshaverstore.com/search.asp?p=1&w=%5F&c=battery&t=s
Hope you find this Very Helpful and best regards!
SOURCE: How can i open 5414 and what battery is required?
To open the shaver, you first need to remove the two screw covers on the bottom of the shaver. They are plastic and on each side of the hole where the cord plugs into the shaver. Then remover the screws underneth. Remove the foil and cutters and then remove the two tiny screws that hold the swivel frame to the shaver. You can then seperate the front and back case of the shaver.
Once opened, you can see the circuit board and the battery attached.
For easier battery replacement, it is sometimes suggested that you use a modified installation technique. This is to break the tabs off of the old batteries rather than unsoldering them from the circuit board. This allows the old batteries to be removed but leaves the tabs attached to the circuit board. You can then solder the tabs from the new batteries to the old existing tabs
You will find this type battery at shaveroutlet.com. See link below
http://shaveroutlet.com/shaver-replacement-battery-aa-nimh-p-108.html
SOURCE: Braun Synchro 7526 Electric Shaver How do I open
You will find an instructional video at shaveroutlet.com. See link below
http://www.shaveroutlet.com/braun_syncro_shaver_disassembly
You will also find compatible batteries at the link below
http://shaveroutlet.com/shaver-replacement-parts/shaver-replacement-battery-aa-nimh-p-108.html
SOURCE: I need to replace the
You will find compatible battery type at shaveroutlet.com. See link below
http://shaveroutlet.com/shaver-replacement-parts/shaver-replacement-battery-aa-nimh-p-108.html
First, remove foil and cutter. Then remove the swivel frame by removing the two tiny screws. Then pop off the two screw covers on the bottom of the shaver and also the screws underneath. You can then gently pry the two halves of the case apart at the bottom to access the insides.
For easier replacement, it is suggested that you use a modified installation technique. This is to break the tabs off of the old batteries rather than unsoldering them from the circuit board. This allows the old batteries to be removed but leaves the tabs attached to the circuit board. You can then solder the tabs from the new batteries to the old existing tabs
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