Battery pack loses charge (Lenovo computer) - Recommendations?

[digi-eu]

My Lenovo computer can be used normally when plugged in, but if unplugged it will be off soon, It looks like I need to replace a battery, I saw a surplacable battery site... advice...?

[edit by moderator - advert to external site removed]
[Further edit - moderator added translation ]

 

[barry]

a Cheap battery may not last as long as one from Lenovo. or it might. personally, id find out as much as I could about the cheap battery and then buy it. Its like taking your car to the dealer vs. a private mechanic.

 

[D.A.(Tony)Stewart]

- better batteries are judged by the unbalanced cell parameters never published, which accelerates weakest cell degradation and reduces life cycles greatly