Hoist battery

[Burgerman]

£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.

[steves1977uk]

My ceiling hoists use a pair of these...

Which is why they fail after about 3 months, even being left on charge when not in use. But Chiltern says the batteries are fine!

Steve

[fishinjunky]

£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.

Great idea I can't wait to see how this turns out. We have had SO many problems with hoist lift batteries on all the lifts we have used in home an the ones at the hospital. I've been stuck in the air many times because of a dead lift battery. Now we use a manual lift. But one with lithium would be ideal.

[shirley_hkg]

To my surprise that you still haven't gone lithium with this important equipment .

Add diodes to suit original charger. Press to display voltage so helper is told to recharge @26.2V !

8 cells 32700 LifePO4 will serve me 2 months per charge, and probably last longer than me .

Materials cost £30 + labour.

[Burgerman]

Not sure wat the current is (will measure) when its lifting my 20 stone but its way more than a silly little toy lead brick can cope with. And yours uses even smaller batts!

Its got to be at least 3 to 5A I would have thought. Just by guessing, But I need to measure this. And no way that a tiny lead battery will be able to give that current without a rapid voltage drop as it does so. At which point the lift "errors" and stops. It works when new, and when fully charged. Only.

To my surprise that you still haven't gone lithium with this important equipment .

Add diodes to suit original charger. Press to display voltage so helper is told to recharge @26.2V !

8 cells 32700 LifePO4 will serve me 2 months per charge, and probably last longer than me .

Materials cost £30 + labour.

I was going to use more energy dense Lion 18650s. As it will be easy to fit everything inside the case and the charge voltage is already correct and on those cells a BMS works OK