Hi-Capacity (B-5755C) Battery

Pros: long lasting, durable, not too heavy
Cons: bit expensive

This battery lasted for my entire trip to New York! I used my laptop with the external battery on the plane from LA to NY and then used it during my meetings and never had to charge it once! It's a little bit expensive but well worth the price and not having the hassle of carrying around tons of cables and chargers.