Modern multi-stage chargers including battery maintainers rely on charging the battery to a specific voltage then maintaining a lower float voltage. The latter to ward off natural discharge. Using a convoluted feed to the battery will result in a volt drop which may compromise these ideal voltage pre-sets. This can lead to sulphatation of the battery plates which if left will reduce battery life if left unattended.

If a relatively large charger is used on a well drained battery the initial charge current demanded will blow the fuse. Even the puny OE battery supplies several hundred amps on start which means it can absorb similar given a powerful enough charger.

Because it works for some does not make it good electrical practice or advice. Just compare the cabling from alternator to that of the power socket if still not convinced.


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone