Panasonic ES-LT71 battery replacement

This video will show you how to disassemble the Panasonic ES-LT71 shaver in order to replace the battery. It will also show you how to determine the +/- poles of a battery using a multimeter, for the rare occasion your replacement battery does not have the poles labeled.
Replacement Battery:
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Precision Screw Drivers:
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00:00 - Start
00:21 - Begin disassembly
02:40 - Battery Removal
04:01 - Determine +/- poles of a battery with a battery checker
04:33 - Determine +/- poles of a battery with a multimeter
07:05 - Battery Installation
07:17 - Razor Reassembly
09:04 - Closing
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[@Ramrunner73]

NOTE: For the LF 71 - The screws taken out at 1:59 actually hold the handle plate, so you can't pull the handle plate off at this stage. You have to flip up the beard trimmer, undo a screw there, unclip the beard trimmer which then exposes those two screws. Only AFTER removing those screws can you lift off the handle plate. Just FYI. Slight difference in models.

[@squirrelattackspidy]

How do you tell the voltage with a cheap multimeter and not an expansive klein multimeter? Thanks!

[@dejavu1754]

Best parameter to check these batteries is measure it's internal resistance in mili Ohms usually between 40-100 then the battery is OK.
Voltage is around 3.8-4.1V and internal resistance in Ohms range the battery is bad and cannot hold charge for long.

[@squirrelattackspidy]

How do you do that with a multimeter? Do you have a video where I can see how this is done? Thanks!