How long does it take to charge my Stanley Battery? Support 19 October 2023 20:06 Updated Follow 2 amp batteries FMC687L take 1hour and 4 amp FMC688L batteries take 2 hours. Related articles How long does it take to recharge a starter? What is the correct charging voltage for my battery? How do I use my Lithium Booster is charged, or if it is charging correctly? I have a number of different Stanley FatMax tools. Can I use the same battery on all these tools? How does the ammeter of the battery charger work? Comments 0 comments Please sign in to leave a comment.