Battery Question

[vapid2323]

I was just about to take my bike out for a quick ride when I found that only one pie was spinning and, at that, really slowly.

I checked my volts and I was at 43v.

So I figured that was the cause and I am now charging, my question is, if I leave my charger plugged into the battery when it is turned off will it slowly suck the life from my batteries?

[Bikemad]

Most chargers used some form of diode/rectifier assembly to convert the AC current into DC, and this should normally prevent any current travelling in a reverse direction back into the charger while it is turned off. I wouldn't expect it to discharge through the charger, but that doesn't mean that it won't.

It's more likely that the key switch was not turned off completely, or there is a problem with the charger or the battery's BMS.
When it has been charged up fully, keep an eye on the voltage and see how quickly it falls. The self discharge figure quoted for the GM LiMn cells is less than 0.5% in a month, which (according to my calculations) is less than 0.01V per day.

How long has it been stood since the battery was last charged?

Is your battery stored in a dry or damp place when your bike is not being used?

Alan
 

[Leslie]

Leaving your battery plugged into the charger with no mains power wont allow you to charge a battery at all , Upon reading GM states its a good idea to unplug the pack when not in use as some of the soft functions use up power.

Many ES forumers are having good success restoring runt cells by leaving packs plugged into the charger regularly for more than three days.

[Bikemad]

GM states its a good idea to unplug the pack when not in use as some of the soft functions use up power.

Are you suggesting that the switch on the battery does not actually disconnect it?
If this was the case, the leds on the battery gauge would remain on when the switch was off.

There are only two connections for battery output, and the Red positive lead goes through the key switch, in which case turning off the key should disconnect the battery.  I seem to recall the key switch has thick red wires soldered in parallel to both poles of the switch, because it switches the current directly, not via a relay or BMS soft switch circuit.  

Alan
 

[vapid2323]

How long has it been stood since the battery was last charged?

Is your battery stored in a dry or damp place when your bike is not being used?

I keep my bikes in a 4th floor apartment, but it has been about 2 weeks since my last ride, and both my 48v's had the same reading. This would make me think that the charger was sucking them dry. I don't think the BMS was an issue as the same thing happend with two diff batteries. Not a huge issue, I will just keep them dissconnected when not charging!