In fact, the lack of replaceable batteries is now becoming a consumer safety issue. Every city has a bomb squad who can isolate and destroy potentially explosive materials. This type of issue can be sorted out much more quickly, and much more safely, by having people turn in flawed lithium batteries to the local bomb squad.

Further, if the batteries were standard sizes then there would likely be replacement batteries readily available with a lower mAh rating that would work just fine, although with a lower lifetime.

In addition, if the batteries were standard sizes and replaceable, we could have a deposit on batteries of a few dollars. If you no longer need it, either turn it or hand it to the next street beggar that you see. Problem solved safely and quickly.