New Lipo saddle pack question

[Will's]

Hi all,

Having not long been back racing I was not sure which Lipo saddle packs to buy. I ended up with a set of core rc saddles and a set of intellect. The intellect set seem fine but the core set are taking almost twice as long dot top up now. My questions are

What might cause the charge to slow so significantly?

How do you best pick a new set of sadle packs?

Cheers

Will