OK up to getting battery unstuck and then disaster - absolutely unable to break the glue seal. Tore wrapper on battery pouch so total loss. Definitely took way more than 20 minutes to get to that point. Difficulty is a lot more than ‘moderate’. I don’t recommend anyone try this. If you do try it (after all - it is not useable with a bad battery), I suggest you do it BEFORE you buy the new battery. FYI the screws are T5 but the lousy tool in the battery kit was totally inadequate to the task - I had to buy a good tool from Home Depot. Danger when mucking with battery is high - I just can not recommend this for the average DIY’er at all.