Let’s just clarify one thing straightaway; I’m talking about an electric toothbrush with changeable brush heads.
I was given an Oral-B/ Braun electric toothbrush as a birthday present years ago, which when you think about it, is a bit of a strange thing to receive as a gift. Maybe the gift contained a hint? Back then, these toothbrushes were not cheap, starting at about £60.00 if I remember correctly. Today, a new equivalent is quite a bit cheaper.
In the time I’ve owned it, it’s had about 40 new brush heads and it’s just about to start it’s third non-replaceable battery.
Make and model: Oral-B/ Braun 3756 931 41306
Fault reported: Battery won’t hold charge
Cost of replacement: About £20.00
Cost of parts: £6.60
Hours spent on repair: 1
Tools needed: Small flat-bladed screwdriver, soldering iron
Sundry items: None
Repair difficulty: 5/10
Cups of tea: 2
Biscuits: 2 Gingernuts
Electrical items with non-replaceable batteries are so annoying.
A message to manufacturers: There’s simply no excuse for it as all batteries are replaceable.
In my experience, items with ‘non-replaceable batteries’ contain entirely replaceable items. The batteries might not be standard ‘AA’ items, but there’s a host of online suppliers that are ready to supply just about any power cell for any application, you name it, usually for a reasonable price that costs-in for the repair process.
Now, I don’t know how long one of these toothbrushes is meant to last, but as a long-term test, I thought it would be interesting to find out. After the first battery died, I decided to take the toothbrush apart, to see what was going on inside.
As you can see from the photos, there’s more within than one might think. There’s a switch, charging circuit, timer circuit, over-pressure circuit, gearbox, motor, mini crankshafts and a battery. Not to mention all of the tiny connecting parts all neatly engineered to work together, reliably. It’s a small work of art really.
It makes me very sad that most of these toothbrushes will end up in landfill, after a few years.
The designers had clearly designed this toothbrush as a disposable item as the battery, despite being readily available from spares suppliers, was hidden, out of sight, under all of the gubbins.
To extract the battery (a simple nickel cadmium item) a full dismantle was required, in this order.
- Prise off the top collar
- Prise off the bottom cap
- Pull out the main mechanism
- De-solder the main pressure switch, charging coil, LED, and some other joints,
- Take PCB off of battery carrier,
- Split battery barrier from the main motor area
- Remember the polarity of the battery, negative near the coil (a misleading ‘+’ there)
- Reassembly, with the new battery is the same in reverse. See pictures for hints.
Twelve years down the line and now on its third battery cell, the toothbrush is still going strong which proves that with a little tinkering, disposable items can be repaired and made to last longer.
It’s just a shame that Braun, the manufacturer, decided to ignore any notion of consumer maintenance.