Hi Les If you mean a higher capacity then the answer is yes. However there may not be room for a larger capacity battery and in a small model it may be too heavy for the hull. Can you post some pics of the installation and advise the actual capacity (eg 2200mA)?
Seeing the battery I would expect you could fit a larger capacity without lowering the waterline too much. If you can find the weight of the proposed battery try adding that amount of lead to the model to test. I'd use the existing battery plus a bit of lead etc. I suspect the higher capacity will make for some interesting sailing so you may need your bike clips! There could also be a heat problem so do check the motor esc after a short warp speed run. Please post progress