17x50 NiMh cells (web says "A" size)

Batteries and Chargers Rechargeable Batteries
1

Hi!

today i opened a Pack out of a medical device…

inside 6 pcs Sanyo cells - each 17mm diameter and 49mm long

nice find: a 70°C thermistor is soldered in series with the pack :slight_smile:



(datasheet says it is made for 2,6A @ 120V AC LINK )

the batteries where heavily glued - so i stripped them (since the big diameter shrink foil for 18650s should work)

they are still in the charger - i update some data tomorrow…

Questions:

  • does anyone have experiences with such cells?
  • what whould you do with them?
  • what is that thing for?

    saw that often in battery packs - looks like there is something inbetween the square pads…
2

The A sized cell is a bigger brother of the AA cell. I’ve never seen one personally, but I haven’t seen any uses for them either.

Let us know how much charge they hold!

3

There are also 4/3 A cells which have the size of 18650s
I have this cell:

But the capacity is not like described and what you would exspect from if you extrapolate from a eneloop.
I hope your Sanyo cells are better.

4

> 4/3 A cells which have the size of 18650

Has anyone seen those in slow-self-discharge (Eneloop-like) form?

5

the item welded to the cells is a polyfuse.
between it and the thermal switch its a well protected pack.

6

i charged / discharged / charged with 700 mA

got 1950 to 2070 mAh
( which seems to be correct, since the device showed that the pack has less than 2100 mAh and has to be replaced :wink: )

7

Seems like a very accurate medical device. Can you provide a little more details about it and how it notified you of the battery capacity?

8

thats a infusion pump.

when i do preventive maintainance i look into the service menu where that value is to read.
(i have to write that down next time to compare)

-> i throwed away near to 100 of that pack the last months…
yesterday i was a bit curious and opened one

if i find a good use for that size i will keep some of the better ones.

9

That’s really cool, thanks for sharing.

The capacities of the old cells aren’t that great though, since an Eneloop would have a higher capacity, lower internal resistance, lower self discharge, etc.