I wanted to experiment with android mobile BTC wallets and stumbled upon Electrum.

I only have one transaction input to this wallet and that was from my Binance account.

I have a balance of 0.002BTC.

When trying to send the maximum value of my balance, I get a value of 0.001BTC (approx 2.89GBP).

The fee says 25 blocks.. 2.5 sat/byte.

I have no idea why it is costing 0.001BTC to send 0.001BTC?