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The question is which version and rating?
Now you need to decide how you will use and charge your devices - will they be charged and forgotten for weeks, or kept on charge until needed, and is your kit especially demanding?
Also be aware that some equipment designed for 1.5v cells that start new at 1.6v and fall to 1.1-1.2 when nearly dead sees a fully charged rechargeable at 1.2- 1.3 volts as half flat and will warn of low battery, even if it is really in perfect working order. It may be worth checking with the makers if 1.2v rechargeable cells are likely to cause issues..
Replacement battery types are:
6 x LR6 (AA) 1.5 V Alaline
or 6 x 1.2 V NiMH
Warning: Do NOT use AA size LiON (Lithium Ion) rechargeable cells as these are 3.4 V each and could permanently damage the instrument.
Note. NiMH rechargeable batteries show a lower charge than alkaline batteries, and may not give much warning before becoming exhausted.
You could try the ones out of the the other meter in the kit you want to use, just to verify you do not get an erroneous flat battery waning.
There are some industrial AA batteries that could catch the unwary out being 3.6 volts.
The MFT knows which type of battery it has in it and I presume the voltage indicator adjusts accordingly. I constantly have a bag of old batteries in my van to leave in a recycling bin, usually the one at a Screwfix, it does seem a inefficient way of working. The number of batteries from smoke alarms is decreasing significantly as the new alarms generally have sealed batteries, the next biggest quantity of old batteries are from the testers, it has also dropped as the MFT has rechargeable batteries in it, so swapping over the batteries in the other testers seems logical as a green measure and as a cost saving in the long term.
nice plot in the article here