GEODIMETER GEODAT 126 : INFORMATION REQUEST

[3e0_rtn]

Hello,
I have 2 units that answer the same error when I use functions which manages the memory.
For instance PG returns 505505 and and P49 (Clear memory) 505.
I suspect the batteries are dead.
I disassembled both units but there's no value (V and mAh) on batteries.
The only indications are obsolete references :
188 YYWW
41B019AC00601
ASM IN MEXICO
[attachment=11601]
If anyone could let me know that would be great.
Thanks.