Remington MB4040 Battery Replacement

Geschrieben von: Cameron Carnahan

Kommentare: 22

Schwierigkeitsgrad

Difficult

Schritte

Zeitaufwand

10 - 15 Minuten

Einleitung

The battery is where the charge is stored and allows the motor to run. The battery is connected to the motor through the motherboard.

Werkzeuge

Schritt 1

Press the black button below the blade to remove the blade.

Schritt 2

Place the device so the back of the product is facing up.
Remove the two 11.0 mm PH00 screws from the black plastic housing at the bottom of the device.

What do you do if the screws strip? they are really cheap

Nadir Khan - 13/07/15

Where does one get the actual battery replacement from?

Evan Dispenza - 08/09/16

You must use a very small blade Phillips screwdriver. A #0 will be too big. Significant downward pressure is also needed to break the screw loose and prevent stripping the screw. It feels like they are glued in. The battery is available in many places and is a 14500 type rated at 750mAh with a 4mm tab on the positive side and a 2.5mm tab on the negative side.

bill - 09/05/21

Schritt 3

Remove the chrome plated plastic piece by using the plastic opening tool to pry it from the housing assembly.
Remove the small clear plastic piece that covers the zoom wheel numbers.

there is double face tape at each end of the chromed plastic piece along with the tabs that need to be unhooked when prying off. So be tender and do not use brute force. Also, the clear plastic piece will likely just fall out so be aware.

bill - 09/05/21

Schritt 4

Remove the two 16.0 mm PH00 screws from the front cover.
Use the blue plastic opening tool to pry apart the two halves of the device.

If you happen to lose the two springs, you can cut off 2x10mm of a spring from a pen :P

Merry trimming and a happy new beard !

Mads Larsen - 22/12/17

I bought a set of Draper screwdrivers specifically for this. Can’t shift any of the screws. Ideas?

Clive Deeks - 08/04/21

The screws holding the body together seem to be of poor quality and possible glued in place, I only managed to remove one with quite a high quality screwdriver and had to drill out the others. Taking this apart takes longer than 15 mins on it’s own leave alone doing repairs.

michaeldavidrowe - 13/05/21

On a MB4045 model, I can confirm that the screws are glued into the plastic and cannot be unscrewed. I had to Dremel out the heads and dremeled a fair bit of plastic in the process. These trimmer model are designed for planned obsolescence. Shameful. The whole disassembly took me 1hr +

After Burner -

Schritt 5

Remove the black blade button and the two 10.0 mm springs, which are sandwiched between the cover assembly halves.
The blade button is sandwiched between the halves and the two springs may fall out when the halves are separated.

Schritt 6

Remove the four 9.0 mm PH00 screws from the motherboard.
Use the plastic opening tool to remove the motherboard from its housing.
This can be completed with the Remington MB4040 Zoom Wheel Replacement installed or removed. Just adjust the zoom wheel until it no longer covers the motherboard.

Schritt 7

Remove the thermal switch from the battery by using the spudger to pry it from the adhesive.
Remove the battery by desoldering the battery from the motherboard.
Soldering tabs hold the battery onto the motherboard.

Thx! But how do you get the thermal switch back again? It seems I can’t just put it back by itself. Can you glue it back or something?

Simon Klintefors - 18/08/20

Ideally you should use a “thermal conductive glue”. You can search online for it. For me this was a non-critical fix so I just used a small amount of fabric glue which will stay flexible so I can take it off again next time, if there is a next time.

Trevor Hayes -

Abschluss

To reassemble your device, follow these instructions in reverse order.

Tinte & Feder

Cameron Carnahan

Mitglied seit: 20/01/15

1047 Reputation

12 Kommentare

Great work - but help on where to source the battery would be good too :)

Matt Purnell - 02/06/17

It's available as a generic - it's a '14500' Li-Ion battery, 3.7V - typically 750-800mAh. Dimensions: 50mm x 14mm (diameter).

Matt Purnell - 03/06/17

I have seen two types of these batteries: protected and unprotected. Which type do we need?

Amaury C - 19/09/19

You did everyrhing except the most important part to me

How did you unsolder the battery, and solder the new battery?

I was going to buy the tools from the local store but realized i don't know how to appropriately unsolder/solder battery tabs.

Non the less you are the only one who made such explanation, thank you.

Rakan - 28/06/17

If you happen to lose the two springs, you can cut off 2 pieces from the spring of a pen :P

Merry Trimming & A Happy New Beard !

Mads Larsen - 22/12/17

The connectors to the battery were in my case spot welded not soldered which created some problems. Soldered both connectors from the circuit board together with the battery. Successfully drilled away the welding points, and then used the now rather demolished connectors again. Soldered the new battery. Not beautiful but it works.

Per Rindstedt - 03/03/18

Thanks, excellent clear instructions. A challenge to do without this guide. Worked for me.

Russell - 03/04/19

Use 3 times only,but not charged

nutakkiprasad.123 - 09/09/20

What new battery do you recommend?

hanejpc - 02/11/20

Veery Good! thx, mate

wmbenard -

Didn’t have a soldering iron. I pried the battery tabs off the battery and used conductive tape to secure them as a workaround. Not ideal but seems to be holding so far

Travis Petersheim -

Thanks! The guide worked a treat on my MB4045. Having a second person hold the board and battery during the soldering helped immensely. For my MB4045 I used the A14500HD10FT (version A) battery from ecoluxshopdirect.co.uk. Lets hope this lasts for another 5+ years. Thanks again to all who contributed to this guide!

Malte - 01/10/22