Rechargeable, 3.6/7V Li-ions not working in roller-blind garage door sensor - why?

[Tommygunn]

Just got some Fenix 3.6V(and also tried some old Trustfire 3.7V's) instead of the installed, disposable Li-ion cells, thinking that they would work just as well in my parent's Crocodile garage door sensor.
Both brands of rechargeable cells will only allow the door to partially open, about 10-20cm, when the remote is activated and then it comes to a halt. This results in the door being unresponsive to the remote with warning beeps and light being emitted from the main wall mounted panel.

Anyone know why re-chargeable Li-ions, on the face of it, don't seem to want to work in the door sensor?

Cheers,
Tom.

 

[Mike Johnson]

Don't quote me, but I think the Fenix and Trustfire have discharge protection built in, if during operation the voltage drops sufficiently to trigger the safe guard they would switch off and not recover for some time, suggest you look at the original cells and buy the same brand and type.

 

[freddo]

Do the regular batteries work it properly? if not the sensor may have been dislodged etc. during battery changing or it has some other fault or requires setting up again.

 

[Mike Johnson]

The sensors are only there to check on the temperature, you can't dislodge the balance circuit, the main problem is the balance of the cells which is done internally with the cells mentioned in the first post, the problem with these items is the non balance of the cells when charging, they put a cheap balance circuit in the unit and do not monitor it correctly to ensure equal charging, hence one cell switches itself off before the other and the whole thing stops working.