Panasonic Lumix DMC-FH4GA, Service Manual, Page: 7 / 57

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2.4. How to Replace the Lithium Battery
2.4.1. Replacement Procedure
1. Remove the TOP P.C.B.. (Refer to Disassembly Procedures.)
2. Unsolder the each soldering point of electric lead terminal for Lithium battery (Ref. No. “B6301” at foil side of TOP P.C.B.) and
remove the Lithium battery together with electric lead terminal. Then replace it into new one.
NOTE:
The Type No. ML421 includes electric lead terminals.
NOTE:
This Lithium battery is a critical component.
(Type No.: ML421
Manufactured by Energy Company, Panasonic Corporation. )
It must never be subjected to excessive heat or discharge.
It must therefore only be fitted in requirement designed specifically for its use.
Replacement batteries must be of same type and manufacture.
They must be fitted in the same manner and location as the original battery, with the correct polarity contacts observed.
Do not attempt to re-charge the old battery or re-use it for any other purpose.
It should be disposed of in waste products destined for burial rather than incineration.
NOTE:
Above caution is applicable for a battery pack which is for DMC-FH4/FS28 series, as well.