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The problem with deep cycle batteries is that they tend to have less cold cranking ability.
I re-vitalized my battery when I knackered it by letting it go completely flat one winter by using a Ctek charger. It's been fine ever since. The Ctek chargers are expensive but still cheaper than buying a decent new battery. And you can leave them connected all winter as a trickle charger.
The problem with deep cycle batteries is that they tend to have less cold cranking ability.
I re-vitalized my battery when I knackered it by letting it go completely flat one winter by using a Ctek charger. It's been fine ever since. The Ctek chargers are expensive but still cheaper than buying a decent new battery. And you can leave them connected all winter as a trickle charger.
Robin
I bought a Ctek (after Robin suggested them previously) and it is good.
(Can't restore a dead one though...!)
CCA does concern me on deep cycles, from the car audio world people tend to run split charge with them only running amps off the deep cycle - not overly practical in a light weight car, plus it doesn't need that much continuous power!
The bosch is still OK. If I charge it then it stays OK for a while, just takes less time now before it does go flat again.
The model range has moved on - I have the MXS 3600 one up from most basic at the time, but works well using pulse charge to restore a flattened battery.
CCA does concern me on deep cycles, from the car audio world people tend to run split charge with them only running amps off the deep cycle - not overly practical in a light weight car, plus it doesn't need that much continuous power!
The bosch is still OK. If I charge it then it stays OK for a while, just takes less time now before it does go flat again.
Gosh - what a choice there is now! Mine simply has three settings Car, Bike and Winter.
Still impressed with it. It even works well on the small lead acid battery (less than 5 amp/hours) that I use to power an old electro-mecanical master clock. (With conventional chargers it's easy to overcharge a small battery with disastrous results.)
I have one of those Patrick and you have the choice of using the crocodile clips,which is a pain to unclip all the time or connect the included connectors that are left in situ when you want to drive the car. The clips are designed to make it impossible to cross connect them. Always monitors the condition and adjusts accordingly. Leave it connected all the time.
Expensive but good