Bosch charger getting very hot

Jasext

Member
Mar 27, 2020
87
73
Swansea Valley
Recently charged my battery while on the bike using the plug on the frame( normally charge indoors out of the bike) , when it finished charging i unplugged it and noticed the charger was very very hot, much hotter than when charging indoors, it does get a little hot but nothing like this.
I unplugged it as soon as it was full, didn't leave it on for any longer than needed, the bike is a cube 140
Anyone else have this problem or is there an issue with something ?
 

Beekeeper

🍯Honey Monster🍯
Aug 6, 2019
1,751
2,197
Surrey hills
Could be our record-breaking hot weather / high ambient temperature. This will affect how much heat energy can be transferred to the environment from the charger. I doubt it would feel so hot in the middle of winter
 

MitchF

E*POWAH Elite
Jun 1, 2019
520
611
Mirokumk38
I’ve had the same thing, the heat generated is concerning. It’s happened when outside temp is 18 or below.
 

Mikerb

E*POWAH Elite World Champion
May 16, 2019
6,568
5,060
Weymouth
I always place the charger on a heat sink.....concrete floor...tile....whatever will help dissipate the heat.
 

GrahamPaul

E*POWAH Elite World Champion
Nov 6, 2019
1,127
1,088
Andalucía
I've got the Compact 2A Charger. I normally don't charge over 80% because that's supposed to keep the battery happy for longer. The charger gets warm, but nothing noteworthy.

However, when I top the batteries off to 100% (I've got 2 of them), then I reckon I could fry an egg on the charger. It's that last few percent charge when the battery management system is supposed to be reducing the charge level and equalizing the cells. It seems to drive the charger wild. (The batteries don't get hot).
 

Jasext

Member
Mar 27, 2020
87
73
Swansea Valley
If i charge it off the bike indoors the charger stays ok , its only when charging in the garage which is cooler and through the frame it gets really hot
 

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