Laptop Battery for eMachines e725 (or Acer Aspire series laptops)

I have an eMachines e725 laptop that shares its 6-cell battery with all the 15.6" Acer Aspire laptops (the Penryn-based models and the 1st gen Nehalem-based models I can personally confirm all have same battery).

Anyone know a good place (online ??) to source a replacement battery pack and if any 9 or 12-cell battery is available which can (somehow) be fit into this laptop ? Flipkart does not stock any Acer batteries.
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