You are very welcome!

Thank you very much for your kind words, I truly appreciate it :-)

You are very welcome!

You are very welcome, and I am glad the video was helpful to you

You are very welcome, and good luck with the project

Thank you and I agree these are really good work horses.

Glad I could help

You are very welcome!

You are very welcome!

You are very welcome, and I am glad it was helpful to you.

You're welcome!

My pleasure!

You are very welcome, and good luck with the project.

@@TECHNOLOGYTIPS101 I failed 😔. I followed your directions, including scraping the top and the bottom of the batteries, but somehow I was not able to solder them. They looked to be of a strange non-metallic alloy that does not allow soldering. Oh well, I tried. I ended to buy a new Philips Norelco 6800 from Costco.,, geez, it's so smooth. Thanks anyway for posting this video, much appreciated.

@@pegasus3611 I wish you had contacted me before spending a ton of money on the new one. In such a situation all you need to do is get this battery linked here www.ebay.com/itm/182123735697

You are very welcome, and good luck with the repair project.

@@TECHNOLOGYTIPS101 how did you remove the original batteries? they don't unstuck when i apply my soldering iron, even though the solder has meltet

​@@lauritseriksen4140 That is because your original batteries were not soldered but welded. There is no way you can melt that so you will need to either desolder the actual terminal plate from the PC board, or use fine pliers to separate them. The pliers force removal is kind of dangerous because you can damage the board, or hurt your fingers. So it's much easier to remove the battery along it's metallic terminals from the board and use your own small jumper wires to attach the new battery.

Thank You, I am glad it was helpful!

Thank you!

You are very welcome, I am glad it was helpful

You are very welcome. Now they are selling the batteries with tabs already welded on them here is the link www.ebay.com/itm/303570625267

Most welcome! I appreciate your feedback

So nice of you

Good idea, I don't have one but I will buy one.

Yep, lol

You are welcome!

Not necessarily, the voltage should be 1.2x2 which is 2.4V, however if there are capacitors in parallel with the battery it could be a little bit higher. The reason is that when you plug in the charger the charging voltage is always a little higher than the battery voltage and the capacitors sometimes retain that voltage from the charger. If the battery shows empty check to see your connections and soldering on the board.

The soldering iron will not loosen the spot welding points. So you have to desolder it from the board and use metal plates to install the new batteries. Keep in mind that you can also buy these batteries new with plates on them already welded, here is an example www.ebay.com/itm/182123735697

I just used long nose pliers to roll the terminal strip off of the battery, but you can also use this kzfaq.info/get/bejne/pLapdZSDrZ7diY0.html

Hi, I don't think you fried something but I do thing there might be a small solder bridge shorting out the LED driver circuit. When the battery voltage reading is 1.3V it means the battery is good, because they are rated at 1.2V and only a full capacity like new battery could reach 1.3V

@@TECHNOLOGYTIPS101 I let it charge fully, checking the voltage every 15-20 minutes and it seems that the circuit board charged them to 1.45V. The actual charging voltage I measured was 1.5V, but the battery voltage stayed at 1.43-1.45 V from the moment the 60% charge LED came on - maybe it was just doing constant current topping up then? Anyway, the indicator now correctly shows the charge level and the batteries don't seem to be damaged, they did not overheat while charging and there is no swelling or anything. I will leave it in and see what happens, but it seems that everything is fine. Thank you for the video, it was very helpful.

Thank you for your kind words, since I made this video I discovered that they sell pre-welded Rechargeable AA batteries so there is no need to heat up the standard AA batteries in order to solder them. Below is a link to these types of batteries. Also yes the polarity is the same on all similar models, and you can verify this by looking at how they are attached prior to removal. Here is the link to these pre-welded batteries www.ebay.com/itm/333536407628

As soon as I get one I will make a video on that.

Yes as along as you keep it out of reach of children, you should be OK.

@@TECHNOLOGYTIPS101 I Keep all my toys away from children lol from soldering stuff to lithium batteries, I agree how quickly you have to get it done and with low heat. It’s amazing how how easy to open and up and the fluid design of this thing. Thanks again for the video

@@So_called-v1j No problem!

Yes it is size AA

The trimmers are not serviceable, but you can replace them. They come as a set with the grill and cutter

Hi you simply press the two sides and pull it up.

Thank you, so I cut the original metal plate with metal cutter and re-soldered it back to the new batteries. However after doing that I found a better way and I made a video about it here kzfaq.info/get/bejne/pLapdZSDrZ7diY0.html

Thanks for the quick reply. So you cut them off. Did you cut them off 'flush' from the old batteries? I understand that these terminals go thru the pcb & are soldered on the other side. I read that some people were un-soldering them from pcb. So you left them soldered to pcb? Also, which model Kerpu spot welder did you get? I see on Amazon they make many models. Thanks for your help.

@@bobyork1235 You are very welcome. So the first time I desoldered them from the PCB then attached them to my new batteries and resoldered them back to the PCB. The 2nd time when I did this video I didn't have to desolder them from the PCB since its removal from the battery was easy with normal solder, as I didn't use the Spot Welder the first time. Also, I bought this one www.amazon.com/gp/product/B092DB5R3S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

@@TECHNOLOGYTIPS101 Hi again, Thanks much for the info. I will use the same technique as you did. I have a Hakko soldering station with adjustable temp. but no spot welder so will probably get that same one you did. I did see that same model by Kerpu you got at Amazon. It appears the main difference between models is how much battery storage capacity they have. I believe you used 2800 mAh AA batteries as replacements? Does that allow you to use the shaver for a reasonable time between charging? I haven't been able to find out exactly what the mAh capacity of the original Braun batteries are. I may just get some MiMH type made by Energizer with a 2300mAh capacity since they are commonly available.. Thanks much for your time & help.

Hi, Good news! Got the job done. 2 new 1700mAh NiMN batteries form a store Batteriesplus. Approx. $5 each & they spot -weld at n/ 4 small nickel plated strips on new batteries. In soldered old batteries from PCB & soldered new ones in. Thanks much for your video & for replying to my questions.

You don't have to go as high as 3000mAh you should be fine even with a 2000mAh batteries. Remember the higher mAh will not change the voltage or power, it will increase the duration of operation and duration of charging.

@@TECHNOLOGYTIPS101 Sorry, but using of modern powerful batteries 2000-3000-3500 mAh in this "old-fashioned" shavers IMPOSSIBLE. Only low capacity 700-1400 mAh NiMH batteries can be installed for following charging and shaver using without main wire. Shaver has built-in "brains" for batteries capacity checking and charging and this info can't be changed. If you'll try to change batteries to items with high capacity, this "new" batteries isn't possible to charge in full. Saver will works 5 minutes after 24h long charging and red discharge indicator will works continuously. Real fail!

@@andrewkuznetsov2064 That is not the case, I am using mine everyday and it charges to full capacity. You must have gotten a defective battery. The charging circuit on the shaver does not stop the charge at a certain capacity. It will stop when the charging current drops due the battery reaching it's full capacity and not being able take any more charge.

@@andrewkuznetsov2064 It works with any capacity battery.

No, Sir. I checked rechargeable batteries from different brands - Sony and GP. New batteries was pre-charged, tested and works OK. For batteries replacement on my Syncro 7570 and 8585 360 grades Complete. In both cases, circuit units after replacement can't recharge this batteries and change for low capacity items (I install Ni-MH 850 mAh in both devices) should be made again. Now all works beautiful. Shavers' "brains" in both this models "don't understand" large capacity of modern batteries and can't charge it in full. It's real problem. Six years ago I got similar problem with Tecsun PL-600 world band radio with built-in charger, when branded high capacity (over 1500 mAh) batteries isn't possible (!!!) to charge, but low capacity Chinese "Tecsun" rechargeable units fills and works well.

I am sorry to here that, but if you could send me a few images of the board maybe I can figure out a way to replace the batteries without having to change the board.

@@TECHNOLOGYTIPS101 Soldering is not my forte, I admit, I hadn't broken out the solder gun in ages. I did more research and the solder tip needing to be cleaned...a lot. Now the hotter tip is making a difference. : )

@@actormarkhopkins8576 Great!

The new battery is still working great after that surgery.

Most welcome