mAh/Wh is just the capacity of the battery, and it's often exaggerated or just plain incorrect on these cheap mass produced batteries. So battery life may be slightly different than intended for the product but it won't cause any issues. As long as voltage is similar(all lipo batteries are 3.7-4.2v, some manufacturers label with 3.7, some with 3.8, etc. But all cells of the same battery chemistry are the same voltage range) it'll operate and charge just fine.