Battery Question/Problem

[RCMONSTER26]

Hi there, I own a T36S which I would categorize as mini whoop. The issue is the battery that came with the quad is a 250mah 45c and so i bought extra batteries which are 260mah 35c but all with losi connectors and the battery that came with the quad works perfectly fine but the battery i bought separately can power up the quad and armed it make all props move but when throttle is applied it cuts.
Thank you

 

[holtneil]

Hi have you checked the voltage of the new batteries once charged
some times they need a charge discharge cycle a few times to get them up to full power