You need to be careful with batteries and look after them.
If you have the faciality to do a battery engine start on your A/C, eg., a light jet or TP, and you have the choice of a ground power, take the ground power every time.
This will avoid putting unecessary loads on you battery. You will need every volt/amp from your battery in the event of eg., all generators off line, for what ever reason, in IMC at night for instance.
You will have about 20-30 mins to get the A/C on the ground if the battery is in good condition, to run the standby equipment.
The above may sound like basics but you will be surprised the amount of pilots (and engineers) who don't keep this in mind.
To answer your question, get the battery changed for a fully charged battery if possible.