While a Battery Tender 'trickle charges' your battery over a longer time, it is a much better and safer charge. Yes and no. Just keep the Battery Tender leads connected to your battery at all times. It slowly adds the charge to the battery and does not allow for the normal depletion of charge that batteries commonly have. On the Audi - using the under-bonnet terminals is the only realistic way as the battery is under the passenger seat and to get at it you have to unbolt the seat from the floor and tip it back. But, as was previously suggested, only do that when you are keeping an eye on the car. It takes longer, but creates less heat as it does so. On any computerized car, you can charge the weaker battery with the cables connected and the charging car running. Can I charge my car battery without disconnecting it? It really depends on a combination of the specific car and health of the battery, as well as the charger you are using. This is where a battery tender can step into the picture and help you to keep your car battery optimally charged, without having to worry about it overcharging. A trickle charger is a car battery charger designed to be left on a car for a long period of time to re-charge the battery. If you are using a conditioning trickle charger, there is no need to disconnect the battery. There are differing opinions of how long a trickle charger can be left on a battery and for that reason, different types have been manufactured. When the car starts, turn off the engine of the charging car before disconnecting the cables; this will help prevent a spike to that car's computer. To ensure that your trickle charger is working, you can also try using it n a different battery. Then simply connected the leads to the Battery Tender when you are done riding. Tired of having to open the hood and having to leave it open just to charge a Rv / Bmw / Mercedes Car Battery? I learned my lessons from having flat battery on numerous occasions until I worked out an effective regime of trickle charging my car once per week and my battery is now 6 years old and still going strong. Just be sure to connect the positive (red) wire first and be sure that your car charger has the correct setting(s) before you connect to the battery. A battery tender uses internal sensors to monitor the charge level of your car battery so it can adapt how it charges it. I recommend charging a battery with a 2amp charger. Yes – you can. As far as the car is concerned, all that happens when you connect the charger […] When this happens, you need to switch off the charger, disconnect it, then plug it back. As I only use the car infrequently, is it OK to connect up a trickle charger i.e. - For more news, reviews and Top Tens, visit https://www.honestjohn.co.uk However, if you should unplug the battery if you are using a full-power charger. 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