I would like an extra battery for my Sony A700 and wonder if I should only use the Sony brand battery, or if the generic brands are okay. The other 3 I see, which are less expensive, are:

1. MaximalPower
2. Synergy Quality
3. High Capacity InfoLithium

If the generic batteries are just as good as the Sony and won't harm my camera, I would rather use one of them instead.

Thanks for any advice you might have to offer.