Yes you can.
Most Braun shavers use AA or AAA batteries. These are often nipple versions which are difficult to come across as they're only used in industry. But you can still substitute normal modern batteries.
My shaver was no longer holding its charge, so I found out how to open it. Braun offer its customers a Service manual which tells you how to open your shaver which is handy!
My Braun 4000 series Razor uses two AA type Ni-Cd batteries with nipples. no details on the batteries of their capacity but I figure they'll be cheap ones around 700mAH capacity.
These batteries just pop out once you remove the inner casing.
To do this with my razor just undo the two screws in the base hidden behind two black rubber stops that just lift out. Note that the two bottom screws have two o-rings in place to keep water out. Don't lose these. :-)
Remove the shaving foil and cutting head to reveal the two star screws on the main head which need to be removed. You'll need a T7 star screwdriver to do this.
Once these 4 screws are removed, lift off the head casing and then simply pull the inner piece out. It comes out very easy, if a little dusty from beard dust!
Give the insides a clean with a dry cloth or use the Braun cleaning brush to clean away the dust.
You'll see two yellow NiCd AA batteries held in by their nipples by force via metal V-shaped sleeves. A small screwdriver applied to an end will simply get each battery out.
There is a small piece of sticky foam on the back of the batteries to help keep the batteries in place. But not much force is needed to get over this and lift them out.
Ni-Cd cells have a memory effect and will become useless after 2 years regardless of how you treat it due to the nature of the chemistry of these old types.
Modern batteries use Ni-MH which will last longer and if you use the latest AA 2000mAH+ types like Maplins Hybrids AA then you'll find they'll keep their charge when not used. So you'll get far longer out of them per charge!
Or just use normal Ni-MH if you can't find these hybrid/Stay charged types.
The old AA Ni-Cd types were typically only 700mAH so you'll get a lot more time between charges if you use any modern Ni-MH battery.
To replace the batteries with non-nipple types, just get a piece of kitchen foil and fold them over and put on each end to ensure there is a tight fit against the metal sleeves.
If you forget the polarity of the batteries, then look on the black casing as there is a - and + marked on it to remind you. :-)
Have fun.
Stuart Halliday, November 2010
