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You could Google "Joule Thief" - basically a minimalist electronic circuit which oscillates and bumps up the voltage enough to do some useful work, like lighting a LED torch or using the dregs in old disposable batteries to recharge rechargeble batteries. Apart from that, just recycle...

"The tenant is a working woman in her 50s who actually spends little time there." I think that's the clue. The property (detached bungalow, meaning all interior surfaces interface with the outside) is intermittently heated - warm when the tenant is there, then allowed to cool down when she...