I screwed up (my a2b hybrid) (with pics)

[fiddyschmitt]

Hey all,

I was tinkering with a multimeter on the computer socket of my a2b hybrid. I must have touched the wrong pins because it arced very very badly. The second last pin was blown apart. Curiously though, when I stopped cursing and put the computer back on - the bike worked okay. Does anyone know what the purpose of that second last pin is? And why exploding it seemingly had little effect?

Yours in palm-to-face,
fidel

 

[Jason27]

Does the bike still run?

 

[Ypedal]

Entirely depends on what purpose they served..... i say it's time to open the box up and have a look inside !!! ( that .. and i'm just plain curious to see the inside.. )

 

[NeilP]

when I stopped cursing and put the computer back on - the bike worked okay.

 

[SamTexas]

I counted 13 pins. So if your bicycle battery is rated 36V and use LifePO4 battery, those would be the balance connectors for the 12 cells insides. You can verify/confirm/disconfirm by measuring the voltage between pins. The voltage between any two adjacent pins should be about 3.3V.

Just a wild guess. I've never seen an a2b before.

 

[The Mighty Volt]

Hey all,

I was tinkering with a multimeter on the computer socket of my a2b hybrid. I must have touched the wrong pins because it arced very very badly. The second last pin was blown apart. Curiously though, when I stopped cursing and put the computer back on - the bike worked okay. Does anyone know what the purpose of that second last pin is? And why exploding it seemingly had little effect?

Yours in palm-to-face,
fidel

You basically shorted the battery pack at cell-level/sub-pack-level, between the two damaged terminals in question.

Each of those little pins represents a terminal. Cross terminals with each other and you get a bang.

Your bike is working fine because the battery was not fatally damaged or has so-far retained a degree of its capacity.

However, the problem doesn't end there. The pack has some damage, and that will need to be investigated more.