How long should you charge a Wii fit rechargeable battery for?

I bought a second hand wii fit board, the game, and a wii fit accessory pack, second hand off of a friend. I'm just wondering how long should you charge the battery for?

The make of the accessory pack is 'enigma'.

It doesn't come with any instructions. When you plug the USB cable from the battery pack into the wii, a blue LED light comes on which is on continuously. I'm just not really sure how long i should be charging it for each time. Any ideas?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).