Battery voltage drop?

[Fordulike]

My 24v 9AH battery is a few months old now and has been used about 4 times a week to around 33% remaining capacity each time.
It gets a full charge after every run without fail.
When it was new, the voltage read 29.6v on the multimeter hot off the charger.
Yesterday i noticed it read only 27.3v hot off the charger.
Is this a cause for concern or the battery just showing it's starting to age?

 

[NRG]

Sounds like a cell has died.

 

[Fordulike]

The bikes performance doesn't seem to be affected, although haven't tested range yet.
If it does have a dead cell, would this drag the performance of the other cells down or cause them to expire quicker?
Is it still ok to charge the battery as normal?

 

[NRG]

Maybe, what battery is is it?

 

[Fordulike]

Good news, i tested the battery pack again today and it's reading 29.6v again.
Maybe the heat got to my brain yesterday when i tested it

 

[Fordulike]

Spoke too soon. Only got 2 miles out of it today before it died
Battery voltage read 22v. Must have dropped below the controller limit.
Oh well, those nice chaps at Sports HQ will sort it out. Their customer service is pretty good

 

[stormb22]

voltage drop

where did the battery come from??

 

[flecc]

Sound like a cell has gone west, time for a replacement battery. I'm sure SportsHQ will replace it without quibble since its not uncommon for a small proportion of lithium batteries to fail in this way, especially those from low cost production like this one.

where did the battery come from??

I've assumed it's a Cyclamatic bike battery since that's the brand SportsHQ's handles.
.

 

[alex_h]

so I assume that battery is Zhejang Zhenlong which probably isn't of the best quality

 

[Fordulike]

Yep yer both correct.
If the replacement battery bites the dust, then i'll replace it with a higher capacity Ping battery.
Reckon the Cyclamatic battery is close to working at it's limit when tackling hills and there's a few around here.