Just had an email through from our dealer, Motorline Toyota Worcester, see below. I have a top of the range Ctek trickle charger that works on stop start cars etc, I forget the model number but I purchased it all year for my old car due to covid. Make sure the power switch on the charger is off when connecting and disconnecting the charger cables to the 12-volt battery. As you will know, there's no starter motor to turn over with the 12V system which is why the hybrid can get away with such a puny 12V battery in the first place. All we are doing as part of the "jump start" procedure is toping-up the battery sufficiently to get the electronics going. The jump start point is clearly designed for, and man enough, for the job. I wouldn't use an old fashioned 'dumb' charger and certainly not leave one connected for any length of time. (The charging system built into in the car will charge the battery in-situ in any case). But a good smart charger will reduce any associated risk to a level that I am happy to live with. There is clearly a risk of "over gassing" and a build-up of hydrogen in the boot area. Make sure the power switch on the charger is off when connecting and disconnecting the charger cables to the 12-volt Battery. If recharging with the 12-volt battery installed on the vehicle, be sure to disconnect the ground cable. Therefore, observe the following precautions before recharging: ■ Before recharging: When recharging, the 12-volt battery produces hydrogen gas which is flammable and explosive. As you will know, there's no starter motor to turn over with the 12V system which is why the hybrid can get away with such a puny 12V Battery in the first place. All we are doing as part of the "jump start" procedure is toping-up the Battery sufficiently to get the electronics going. "If you have a 12V battery trickle charger, or a solar panel charger, and are confident using them, then these are a good option to keep the battery fully charged while the vehicle is stationary for a period of time." Extracted from the Toyota UK blog advice:
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