Me again! I've just ordered a new Optimate 3 battery charger from eBay to use on my car and my wife's as well. Having never used such a device before I've got a few questions that perhaps some of the more knowledgeable members on here could answer! Is it possible to charge the battery in situ? If not, I assume I can manually lock the doors on my Accord? And how long would it take to test and topup the charge on a Bosch S4 battery that has around 75% charge? Also how do I know when it's ok to disconnect it; I assume it lights up a green LED or something? Thanks!