Bought this as a backup for the battery supplied. It lasts substantially longer and is far cheaper than a Canon replacement and seems a little lighter. Was a little scepticle at the price but highly delighted - a great purchase.
Finally there is an LED replacement for the Halogen GU10 lamp. These really are as bright, if not brighter than the 50w halogens we had with the benefit of being a tenth of the energy consumption. Only slight regret is I opted for the "Pure White" version which are a little stark - rather like modern high intensity headlights on cars. To avoid this I'd suggest the "Warm White" version . If in doubt buy 1, as I did, to convince yourself then get the rest. A very sound purchase - Very pleased !