Unfortunately this depends on a number of factors. If you have had to jump start a car it could mean the battery has simply reached the end of its life, but it could also mean either something has drained the battery or the car simply has not been driven enough. If the battery is 5+ years old, the recommendation would be to change the battery. If the battery is fairly new and it has gone flat as the car isn’t driven enough, then we would recommend to put it on a good battery charger with a recondition function to get it fully charged up. But if it continues to let you down, the battery may have been damaged by allowing it to go too flat for too long, which would mean a replacement is necessasry.
This would depend on the size of your battery, the general recommendation to charge batteries that are very flat or deep cycle and leisure batteries would be to get a battery around 10% of the Ah Capacity of the battery. So if you had a 60Ah battery you should get a 6Amp Charger. If you want a charger to simply maintain a battery on a car/motorcycle that isn’t used very often then most battery maintainers are around 0.8A. But remember a good automatic charger will also act as a trickle charger/maintainer once the the main charge is completed so you can leave it on indefinitely.
Government Legislation since the 1st of June 2018 prohibits the sale of acid packs with or without batteries to the public unless you have a valid EPP (Explosives Precursors and Poisons) Licence. We try to sell sealed versions where possible, but if you are local you will be able to collect these types of batteries pre filled by us (until we find a way to safely send them in the post)
It is not recommended as the electrical system in the car is designed for the EFB or AGM type batteries which might include higher charge voltages, and periods of not charging while the engine is running. And of course no warranties would be valid for the wrong fitment.
In theory you can use any battery of the right voltage for it, but using the correct type of battery ensures the money spent gives you the longest possible life, as normal car batteries are not designed to be left slowly discharging for long periods of time before recharging, so will fail much quicker than the appropriate battery.
In order to work this out, you need to check the power ratings of all the appliances you expect the inverter to power at one time, and also allow for peak spikes and a small margin of error. Also remember to check if the rating of the Inverter is the Constant or Peak Rating. If you are planning on using sensitive electronics we always recommend a PURE SINE WAVE INVERTER only.