IC-7300, IC-7100 FITTED WITH EXTRA RECHARGEABLE CLOCK BATTERY LR2032, 3.7 V/40 mA

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On the internet are various descriptions to replace the backup clock battery of an IC7300 by desoldering or cutting, connectors are disconnected, front plate is removed and the relevant pcb is lifted.
All that effort is not necessary if you install an extra rechargeable Li-Ion battery LR2032, 3.7 V/40 mA of larger capacity.

PA2RUS

PA2RUS read this article and also equipped his IC-7300 with a rechargeable battery. Since he owns an IC-7100, he investigated whether this set was suitable for the same modification. It turned out that installing it in the IC-7100 was just as feasible as with the IC-7300. The images below can confirm this.