Originally Posted by CMeys
Can you please link to that other board's explanation.
Happy to .It is post #22 by st23r on the Forum "External battery for A100".
He cut the cord but it is not necessary if you purchase the following on Ebay under "Car DC Adapter For ACER ICONIA TAB A100 Tablet PC Auto Power Supply Cord PSU P/S"
Make sure you ask for the extension cord ONLY. It will be $4.99
Get a Li-On battery here: Ebay "Power Pack 12V Li-On battery 4800 ah"
It will cost $23.74 delivered (USA). Both parts fit together without adapters or cord cutting.
Hope it works as well for you as me.