Originally Posted By Dan_Lockwood
Originally Posted By Draggin
Obviously if I was to have a deeply drained battery I would pull the bonnet, and use my bigger charger connected directly to the battery terminals.


I agree, "tenders" are not battery chargers. They require a well charged battery to do their thing.

If you have a dead or low battery, get a battery charger and get it up to normal and then plug in the tender so it can keep it in ready to go range.


Better still get a smart/multi-stage charger that does both. Once on the lower float voltage it makes no difference how powerful it is - they are designed to be left on long term unattended.

Many also have an auto maintenance mode which kicks in every 14 days or so. This stirs up the electrolyte by temporarily increasing charge voltage, disturbing undesirable stratification due to lack of use and warding off ageing sulphation of plates.

Richard

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