How do you replace the battery on a 800rx my shaver dosnt work

RAZOR replacement battery 2000mAh for men electric shaver philips hq 7390 replacement parts.

It appears that the battery needs to be replaced. shaveroutlet.com has the battery you need and installation video. They can also replace it for you
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The problem is that the battery pack is worn out and need replaced. You will need to see if this unit has one or two batteries. You will find these batteries at shaveroutlet.com. See links below for these two types

http://shaveroutlet.com/shaver-replacement-parts/shaver-battery-pack-for-most-norelco-more-p-278.html

http://shaveroutlet.com/shaver-replacement-parts/shaver-replacement-battery-aa-nimh-p-108.html

Scroll down the item pages for helpful videos for dismantling and installing new batteries

Philips suggests that you change the heads on your shaver every 12 months. This is the life expectancy on newer models. There are not any other options but to change them as needed.
For replacements, see shaveroutlet.com at the link below

http://shaveroutlet.com/shaver-replacement-parts/norelco-philips-rq10-arcitec-replacement-heads-p-353.html

You will find the correct battery for model 7800XLCC at shaveroutlet.com. See link below

http://shaveroutlet.com/shaver-replacement-parts/shaver-replacement-battery-aa-nimh-p-108.html

If you prefer to shop for another shaver to replace the one you have, you will find the entire selection of Norelco shavers at shaveroutlet.com. See link below

http://shaveroutlet.com/shavers/rotary-shavers.html?manufacturer=4

It sounds like the battery pack needs replaced. You will find the correct battery type at shaveroutlet.com. See link below. You will need to order 2 batteries

http://shaveroutlet.com/shaver-replacement-parts/shaver-replacement-battery-aa-nimh-p-108.html

To replace, you will need to remove the back cocer by removing the two screws. Take off back cover to access inside. For easier replacement, it is sometimes suggested that you use a modified installation technique. This is to break the tabs off of the old batteries rather than unsoldering them from the circuit board. This allows the old batteries to be removed but leaves the tabs attached to the circuit board. You can then solder the tabs from the new batteries to the old existing tabs

Most likely, the battery just needs to be changed. Open the shaver by removing the two screws near the bottom on the back of the shaver.<br /> You will find the correct battery at shaveroutlet.com. See link below<br /> <br /> <a href="http://shaveroutlet.com/shaver-battery-pack-for-most-shavers-p-211.html">http://shaveroutlet.com/shaver-battery-pack-for-most-shavers-p-211.html</a>

The spring on the trimmer for model 800RX should not come out. If it has come out from the trimmer, almost certainly the two tiny bits of plastic that hold the spring to the trimmer are broken off. You will not be able to repair this properly...sorry

The spring has two coils, one at each end. They need to be pushed, hard, into the plastic tabs. I heard each side 'click' in. I wasn't pushing hard enough at first.

The battery has finally degraded to the point that it won't hold or pass voltage, so yes it needs to be replaced. Luckily, with a few skills, such as disassembly and soldering, you can remove and reinstall a new, rechargeable battery that should get the razor working like a champ.

Electric Shaver Service stocks most rechargeable replacement batteries for almost all electric shavers made.

Here's a link to the battery page, just find your model and you're ready to go. If you want, you can call and confirm which is the correct replacement battery for your specific model shaver too.

http://www.electricshaverstore.com/search.asp?p=1&w=%5F&c=battery&t=s

Hope you find this Very Helpful and best regards!