Customer reviews for WLToys 1S 3.7V 400mAh LiPo Battery (K127)

4.0
The battery did not fit easily and is very tight once inserted. The performance is like new. The fit will probably improve over time with use.
Reply · James R.
Hey Christian, Thank you for the review. Yes the battery is a tight fit to start with and I am sure they do this on purpose so that you don't lose a battery during flight as you use it. Its good to hear that your flight performance has been restored! Fantastic!
12 March 2026
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