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Just an update, I gave the wrong battery number - the ER26500 is only 8.8aH, it's actually an ER34615 that's 19aH, and it's one of those we're sacrificing in this test. Ooh - just checked the price of them, £21.13+vat from FarnellWhile I think about it, I mentioned earlier I was going to test a non-rechargeable battery EVE ER26500 once the 18650's ran out - but I'd got enough bits to build another unit (and a suitable SIM card), so I've build that up and got it running now, feeding a separate MYSQL table for simplicity. So we'll see if it makes 60 days!!.