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Ultimate Geek
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Topic # 152290 22-Sep-2014 19:05
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Hi All


Need to replace batteries in rechargeable razor, they look like AA possibly slightly shorter, there is absolutely no useful info on them, they are nicads, and they are not easy to get at when the razor is assembled.


So i am guessing i'll should stick with ni-cads as they are charged within the razor and nicads don't mind overcharging as much as other rechargeables do?
Do they still make Ni-Cads and where would I get them from

Thanks 





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Stu

Hammered
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  Reply # 1134010 22-Sep-2014 19:08
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They look like standard Ni-Cads. Jaycar used to stock them and probably still do. Some shavers need batteries with solder tabs or fly leads but yours just look like stock batteries.

Even Noel Leeming etc should still sell them? Not that I've tried there personally.




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Master Geek
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  Reply # 1134384 23-Sep-2014 10:38
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I have purchased replacement shaver batteries from these guys in the past.

http://www.abtecparts.co.nz/

Worked well for me - just needed the model of the shaver.

Good luck! :)

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  Reply # 1134846 23-Sep-2014 19:17
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Bunnings.  You still get NiCd for garden lights.  But you can also use NiMH.  Both are equally susceptible to over charging.  For both the manufacturers say there are no issues with over charging, but that is regarding swelling/leaking/exploding.  It is not regarding reliability or cycle life or retaining capacity.

The difference is NiMH is "green" and there is legislation to use "green" components for all products with some exceptions (which just has more time to migrate due to their safety/risk nature).

NiMH cycle life is 300x, NiCd is 500x.  NiMH has a higher series resistance, but with higher capacity the relative series resistance is lower.  NiCd can have the same capacity as NiMH, but they stopped developing it due to being phased out.

There is no such thing as memory effect any more, it was solved in the 80's.  There is now a different effect that applies to all Ni-based batteries which is reversible by slowly discharging over 20-40 hours, and is not a permanent memory effect.  Ni-based batteries fail because they get constantly charged, better to charge for 1-2 days when running low instead of 24/7.




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  Reply # 1137432 25-Sep-2014 13:06
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Alternative is:
just take those batteies out, and power device from 2.4 Volt power supply. Insatall small connector on the body of a shaver.
LM317 with couple of resistors will convert 12V from PC Power Supply or any other 12V 1A adaptor (like those used for routers) into required voltage.
LM317 will need heatsink and cooling fan. Use small plastic box to put that stuff in it. I used box from another power adaptor and silent 12v fan from PC.

Using that solution for more than 10 years now as battery in mine (was 1 x 1.2V)  had died ages ago.

Note: LM-317 can do as  low as 1.25V. With your 2.4 Volts and possible conversion from say 5VDC from PC - you may not even need the fan.

Another thought - you may try at your own risk to power it up from 3.3V PC power supply.

I power screwdriver rated at 3.6V (3x1.2NiMH inside just died) from 5VDC PC Power Supply without voltage conversion - works absolutely fine and power cordless drill (not cordless anymore) from 12 rail on PC power supply.

If I had to buy batteries for all those toools - that will cost me.
Because those devices are all used indoors I did not find any inconvenience of having a wire attached (via plug).
3.5mm receptacle - you can take out of the modem/router or buy for $1.5 - those are easier to install. Wires with the plug - from power supplies - from routers/modems 








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