On 08/01/2021 13:31, Chris Holmes wrote:
Theo wrote:
newshound wrote:
Cells are sometimes very tight, the usual solution is violence. In this
case, you don't need sealing at the top of the turret, I'd suggest
drilling a couple of holes that would line up with the axis of each cell
and using these to press them out. The cells will presumably be bridged
by a conductor strip, so they will need to be pressed out together.

It may also be that they're glued in. A little heat (hairdryer?) may loosen
the glue.

If there are 10 cells, that suggests NiMH - or is it old enough to be NiCd?
In principle there's no reason why you couldn't go for more capacious cells,
although your charger may not charge them correctly (a completely dumb
charger is likely to be fine, a 'smart' charger that isn't very smart may
terminate the charge too early)

Theo


They are Nicads. And I think the charger is dumb.

There are two sorts of nickel chargers. One supplies such a low current
that it never switches off. Fast chargers all work on the delta peak
principle which is that, at a constant charge current, the cell voltage
drops slightly as full charge is reached.

Neither charger cares about how much capacity the cells are - big ones
will take longer to charge, that's all.

However there is one gotcha. The delta peak is far larger on NiCd which
means that a delta peak charger designed for NiCd may *not* stop
charging on the smaller delta of NiMh cells.

In short a NiMh charger will always work with NiCd *and* NiMh, but an
NiCd fast charger *may* not work with NiMh.


I wonder if I could use NiMH instead?
If the charger works, its a better bet, just dont flatten them - NiCds
will take it but NiMh will not...


I think Ive substituted those in Dect phones without any issues.



--
€œwhen things get difficult you just have to lie€�

€• Jean Claud Jüncker