£160
This is for an Oxford Midi 180 and fits many other similar lifts.
I unscrewed its casing. It contains 2x 12V lead batteries. Tiny 3.2Ah sealed AGM ones. They are around 9 to 12 uk pounds each.
So do I call the NHS, and get another 5 year old battery that they have "tested" (they couldnt "test" a battery to save their lives). Or buy a new £160 one? Or Buy a pair of £12 ones and fit them myself which is literally a 1 minute job. Well none of the above. Lead is crap.
I am fitting lithium ion 18650 cells. 7S, and 10Ah in the same space. So 3x the capacity, and 5 or 6x more "lifts" before recharge required. And will recharge much much faster. And that will cost me around £60. But it will last many many times longer.
Will photograph and details in case you want to do the same. Should be super simple.