I took the LT1512 figure from the spec as attached. The battery is a 8,4V NimH 2000 mAH.
The current value is limited by R3 that is in my case 0.5 Ohm so the charging current is 200 mA.
R1 was defined further the spec formula, means 71k for R2 of 12,4k. Vin is 3V that seems coherent with the spec.
But it works only at the starting, several seconds and then the charging current goes down to 20 mA
I don't understand why ...
The battery is empty.
When I take off and on again the battery, still 20 mA;
When I power down and up...200 mA during several seconds and then 20 mA;
Do somebody have some idea from where it could come from ?
Thanks a lot for your help