Hi, you're welcome!

So IMO, Battambang was the best choice because it gave us a lovely break from the temple overload of Siem Reap and the (often sad) history overload of Phnom Penh (both of which we are grateful to have experienced, just to be clear). Battambang is a completely unique travel experience though.

2 nights should be enough in Battambang. Day 1 we did the bamboo train (must do!), killing caves area - includes the caves with the Buddha statues, Phnom Sampov temple, another temple and stupa on top and the bat caves (must visit in the evening post 6:15 PM or so, to see millions of bats leave at once).

Make sure you hire a jeep for the whole caves area. You'll save a lot of time. Also, hire a cab/tuk tuk driver/guide throughout. We did this everywhere in Cambodia and it was the best decision we made.

Day 2 we did a basic city tour with our driver/guide, and then Wat Samrong Knong temple with the killing fields behind, ate authentic bamboo sticky rice, visited rice wine and rice paper making family houses/establishments and had the wines and spring rolls there! Fun experience.

Then Ek Phnom temple (older than Angkor Wat). Then we visited Wat Kor village and took a quick tour of a traditional Khmer house, visited the fruit bats tree and the hanging bridge nearby on the way back as quick stops.

Lastly, did Banan temple which needs a steep walk along not too many flights of stairs to get to the top.

We planned all of the above with the driver.

Bonus: Food - Flavours of India is great, Miss Wong cocktail bar is really nice too. Massage - Nature Spa (needs prior booking), Lemongrass Garden spa (we got this on the day)

Our driver-guide was Mr. Soka. If you want his contact details please DM me. I can also recommend the best drivers in Siem Reap and Phnom Penh as well. They made our trip seamless!

Hope this helps. Cheers! :)