Give it a few days then check they are still 12.4v if they are then its not losing power, and you are probably ok, BUT if you ever need a good battery I always get mine from this guy https://www.lincon.co.uk/ he makes them in the UK and posts them out to you just tell him your make of car and he will know the max battery size and power you can put in, he had knowledge, and he even will make the old type with the lead showing if you want a classic one