TZ30 - External Charger?
This is what I bought for my ZS15 (takes the same battery as the ZS20):
Read the Amazon customer reviews for additional information.
If all you need is the charger, I'd recommend this product:
It shows a red LED light while recharging, green LED light when fully charged. It has foldable electric outlet prong for easier packing.
I've been dealing with the vendor Blue Nook for several years now and highly recommend them. Great customer service!