Thanks HF that was my thinking, but i always thought the battery should not be on charge all the time (but I suppose its not really)!
So just to confirm my Hotline HLC80 Gemini which is daul charge has the battery powing it via the correct leads. Then a normal car charger topping up the battery.
Yes, I gues its best to have a trickle charger not a fast charger ......
The HLC80 is just such an energiser as I've described which can be mains or battery powered (it's not unique in this regard despite its sales blurb selling this as a major feature). It has a plug top 12V psu with a lead which plugs into the energiser and they also supply a replacement lead to use with a battery which can also plug into the energiser. Using a battery with a
charger you have a choice of how you can run the cables
1 You can site the battery adjacent to the charger indoors (an outhouse or garage for example) and run a cable from the battery to the energiser which is located by the fence. You can 'extend' the battery lead they provide to do this using old mains cable.
2 You can site the battery adjacent to the fence and energiser and run a long charger lead to the charger situated in an outhouse. Again using old mains cable from the charger to the battery
3 You can site the charger, battery and energiser in an out building and run the high voltage cable out to the net. To do this you'll need a special high tension cable called a 'run out cable'.
This has the advantage that all the active components can be secured and are protected from the weather. Although the energiser can be outside I prefer to protect it from direct sun, rain and snow (but don't enclose it so condensation can form). The disadvantage with this arrangement is that it's usually more convenient to be able to switch the power off at the net itself rather than have to enter an outbuilding to do this.
I use method 1 for some of my runs which are close to an outhouse (stable block)
It's best to use a modern charger which will automatically switch to a trickle when the battery is at full terminal voltage. Effectively what happens is that the charger will effectively supply the energiser current and the battery will charge up to the charger terminal voltage which won't do it any harm.
A Technical explaination you can ignore unless you're interestedIf you have a modern charger which indicates when it switches to trickle (or shows when the battery is fully charged) you will notice it switching back and forth between charging and fully charged (or trickle charge). The reason being the charger will charge the battery up to its set terminal voltage and them switches to trickle (or shows fully charged). The trickle current won't be sufficient to supply the energiser and the battery will supply the extra current needed causing its terminal voltage to fall. When it has fallen sufficient for the charger to detect it needs to switch to full charging again it will switch modes back to charging and the cycle will repeat itself. The battery will cycle between charging for a short period and them discharging for a short period and so on. It will never be seriously discharged which is why a car battery will do the job rather than needing a leisure battery.
HF