My wife has just bought an e-bike and I'm confused about the different advice found about battery charging. In the bike's manual it says this - "For the first 3 times, please fully charge and discharge the new battery (please consume all the power after fully charged) and then charge for 24 hours again." I decided to check and consulted Google, where almost all sites warn against ever fully discharging the battery. Help please! The battery is a Li-ion 36v/10ah model.