What if batteries leak after being drained of every last watt hour of capacity by any batterisers fitted, and as a result 'gunk up' your nice shiny product?
This is Duracell's guarantee regarding battery defects:
http://www.duracell.com/en-us/guarantee I assume other manufacturers also have something similar.
"Should any device be damaged due to a battery defect, we will repair or replace it at our option. Leaking battery and damaged device must be provided as proof of claim.
Duracell may deny claims of damage caused by misuse or modification of the batteries or device."
I suspect Duracell (and other battery manufacturers) will class the fitting of a batteriser sleeve as a "misuse or modification" and refuse any compensation due to leaky batteries which they will claim was caused by the batteriser.
What guarantees (if any) do batteriser provide, regarding their product causing damage to the
suckers users shiny products
The lawyers will love this one