sounds like the battery is on it's way out
you can get an Optimate or similar - these will monitor the state of the battery & apply a gentle charge if needed, but does need a 240v power supply, so not very easy if it's parked in the street
A decent battery should be alright on it's own - just as long as you give it a decent run each day to make sure it is recharged, ie a bit more than just 5 mins down the road
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