The mAh Rating is very important, its the Capacity.
Example : a 2400 mAh Battery will deliver 2.4 Ampere of current for one hour. Simple.
Or 1.2 Ampere for 2 hours. In Fact it will last longer at lower Current. (non linear)
Rechargable Batteries are a complicated Topic.
NiCds are almost extinct, they are poisonous and bad for the Environment,
Capacity is very low, so forget them.
NiMh are the way to go, good Capacity and not too expensive.
Voltage of both Types is 1.2V/Cell. This can be a Problem
if your Detector is designed for Alkaline Batteries ony (1.5V/Cell)
but thats very unlikely.
To take good care of these, there are a few point to note:
- use a good Charger, a Microcontroller Trickle-Charger is best.
- dont overcharge, this will ruin the Batteries (leads to fast self-discharge)
-
keep them warm during use, they dont work well at freezing temperatures (capacity will be low)- dont overheat. super quick charge at high current is bad
- be careful when carrying charged batteries. if you keep them in your pocket
together with keys or other metal, short circuits can happen and burn you really bad.
- dont do a deep-discharge. replace battery if if you see it gets weak.
- there is no need to use a Discharger, the memory effect of NiCd Batteries is a myth
it will never happen at normal use
The best capacity/weight ratio can be found in LiIon or LiPo Batteries, but these are expensive,
need a very special Charger and they wont fit as replacement for normal Batteries.
Improper Charging of these will lead to burning or exploding batteries.
If you dont care about weight, the cheapest Batteries you can get are Lead-Acid types.
again, like the Lithium Batteries, these are no fitting replacement for normal Batteries.
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« Last Edit: February 09, 2009, 10:54:09 am by Sauerkraut »
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