I searched and found several situations:
1. The plug-in gas meter does not have a low voltage protection mechanism and will not be forced to operate when the voltage is below 1.35 V. You can use rechargeable nickel-hydrogen batteries;
2. Plug-in gas meters have a low voltage protection mechanism. The reason may be that the old battery with insufficient power may leak and corrode the gas meter. the nickel-metal hydride rechargeable battery cannot be used;
3. Wireless smart gas meter reading and billing consumes a lot of power and cannot use 1.2V nickel-metal hydride rechargeable batteries.
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In both cases 2 and 3, if someone checks every day if the gas is turned off at home, you can use a rechargeable 1.5 V lithium step-down battery. battery, suppliedwith overcharge and overdischarge protection circuits, such as Nanfu and Shuoerbo lithium rechargeable batteries (USB interface rechargeable batteries). For particularly humid southern environments, you might consider the Juji with a stainless steel shell (small parallel connection with an external USB). interface). Charging the battery box).
Since ordinary 1.6V nickel-zinc batteries do not have over-discharge protection circuit, they are easily damaged when used in quartz clocks. I don't know if they can be used in gas meters (more on that later). I saw that they have built in protection circuits) made of nickel and zinc, but I don't know how effective it is)...
Some people also use 2 rechargeable batteries 3.2 V lithium iron phosphate battery with protection circuits againstexcessive discharge, plus 2 fake replacement batteries. Personally, it seems more difficult to use it in cases 2 and 3. Now that there are 1.5V lithium step-down rechargeable batteries, there is no need to use this solution.
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Added: However, the price of 1.5V step-down and anti-over-discharge lithium batteries is relatively expensive. I looked for a 4 cell USB port. charging (can be charged with a mobile phone charger), Juji costs about 90 yuan.
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2 additional: A lithium battery with an over-discharge protection circuit is used. In fact, she won't turn off the power until 2 days before the end. -A discharge occurs. If the user was on a business trip and forgot to charge it at home, it will still overdischarge, which can significantly reduce battery life...
So, if there is nodump. one at home for more than 2 days, it may only be suitable to use a disposable lithium dry battery. (Carbon dry cells are cheap, but they will rust and leak after more than a year; alkaline batteries are moderately priced, but I've heard they can still leak).
No longer dependent on an independent battery charger, using lithium battery cells. According to the relevant information about Shuoerbo USB battery, we learned that the reason why Shuoerbo USB battery is expensive is that it no longer relies on an independent battery charger and uses lithium batteries. Shuoerbo USB battery uses lithium polymer battery cells, which can be recharged 1000 times without memory effect. Intelligent IC chip can ensure safe battery use. Not only does it not require a special charger, but it can be fully charged in just onein an hour.