What is Reddit's opinion of Battery Tender Plus 12V Battery Charger and Maintainer: 1.25 AMP Powersport Battery Charger and Maintainer for Motorcycles, ATVs, UTVs - Smart 12 Volt Automatic Float Charger - 021-0128?

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Get yourself a Deltran battery Tender Plus. Not super cheap, but they are the best battery maintainer on the market. I've had one for over 20yrs, and it still works perfect.

You may need a new battery depending how old it is. They don't last forever.

I use a battery Tender

This should be standard info when someone gets a new CPAP. Not hard to do and why suffer during a power outage or give up camping etc

*** Check with your CPAP Dr etc before you hook anything up. CPAP machines are expensive. Wouldn't want to damage machine and have to buy one out of pocket. ***

For the battery part, use a AGM deep cycle battery. They vary in price. From a Walmart battery to a longer lasting Lifeline AGM battery. It is sealed vs a flooded cell battery which needs venting. Figure out amps used by machine {sticker on back of machine should have amps} and multiply number of hours and number of nights you need. Of the total capacity of the battery, i.e 100 amps, 50% is available to use on a regular basis. Discharge to 80% will cut the life of the batter in half. In a emergency, one could just run it all the way down but that would ruin the battery and you would need to replace it.

Battery is 12 volt and CPAP machine is household 120 volt, you would need an inverter to convert from one to another which has a efficiency loss. Best is to get a DC 12 volt power cord for your machine if possible and not have that conversion cost.

Charging deep cycle battery, just buy a charger on Amazon.

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU If you want to get fancy, you can charge the deep cycle battery while driving. Look up alternator charging.

People in RV/Travel trailers use deep cycle batteries all the time to run electronics. Good source of info on how to do things.

You would have to check the amps needed for 1 night, but a big external battery charger might work. Anker makes a 26,800 mAh battery, about 21,000 {80%} mAh available. There are some bigger ones by other companies. This would be super light weight for travel.

CPAP humidifier uses a lot of amps. If you can sleep without it, it would allow the battery to last longer

Did I miss that you use a better tender when the bike is stored? Most people store their bike with the gas tank full and the carbs drained, not sure why others hadn’t mentioned this. Try using starting fluid to get it running and maybe that will Prime the carbs?

I use this tender when stored, even during the season because I ride mostly on the weekends. I too have an I heated garage in upstate NY. So far so good.

https://www.amazon.com/dp/B00068XCQU/ref=cm_sw_r_em_api_i_c_3wB7AbK953D28

Nah it's just a standard 12V battery. You don't need a fancy tender. Anything that connects to your connector will work. And all the ones I've seen come with the pigtail so you can yank yours and install it.

I like this one because it has a few more amps for quicker charging if I'm in more of a hurry:

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU

But any tender will do.

Here is the tender I'm using, which says it's also a charger: https://smile.amazon.com/gp/product/B00068XCQU/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Should this be sufficient to charge the battery, or do you still think I should get a separate charger?

What should I be checking with a digital meter?

If you want to keep it permanently mounted, I would adapt influx's idea to a 120v signaling relay, that connects the wire between the tender and the battery. Plug it in, relay closes, tender gets connected. Unplug it, relay opens, tender can't pull juice.

Also, I don't know how many places you plan on charging your bike up but the Delran tenders have detachable cables. When I want to put it on the tender, I untuck the cable from the storage compartment, plug it in, and when I'm done, unplug and tuck again.

I also have an R3 that sits most days. Use a battery tender. She'll be fresh and ready to start every time!

https://smile.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU/ref=sr_1_6?dchild=1&keywords=battery+tender&qid=1614144410&sr=8-6

If it says 'battery tender' thats what you want. Here's one at amazon;

http://www.amazon.com/Deltran-Battery-Tender-021-0128-Charger/dp/B00068XCQU

An older version of the Battery Tender Plus. It is more than what is needed, but works great-

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU/ref=sr_1_4?crid=1S23Y7E9NJE3M&keywords=battery+tender&qid=1670248301&sprefix=battery+tender%2Caps%2C145&sr=8-4&ufe=app_do%3Aamzn1.fos.006c50ae-5d4c-4777-9bc0-4513d670b6bc

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU

Get something like this instead.

I also wfh so I drive mainly for grocery shopping, errands, or appointments which are usually short drives once or twice per week. I've been using Battery Tender Plus for several years now on both my old 2010 Mazda 3 and the new 2022 Mazda 3 that replaced it. You can keep it plugged in as it'll automatically switch from actively charging the battery to simply maintaining it.

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU/ref=sr_1_8?keywords=battery+tender&qid=1654983821&sr=8-8

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU

https://www.amazon.com/dp/B00068XCQU?ref=ppx_pop_mob_ap_share

https://www.amazon.com/dp/B00068XCQU?psc=1&ref=ppx_yo2_dt_b_product_details

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This is where and what I purchased. Very good. I plug it in everyday

Regular old battery tender brand does the job just fine. Used it for years. If you plan on getting a lithium battery buy a tender that can do both.

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU

Parasitic draw, basically something electrical is failing and not going to sleep when the car is off. You would have to pay a shop an hour or two to do this test to find out what circuit is draining the battery. The temporary fix is to just get a wrench and disconnect the negative cable before you leave it sit. Or if you have access to an outdoor power outlet, you can install a battery maintainer under the hood that will keep the battery alive.

These 3 things will ease your worries, 12volt batteries with a good inverter & tender will work perfectly! Battery Tender Plus 12V Battery Charger and Maintainer: 1.25 AMP Powersport Battery Charger and Maintainer for Motorcycles, ATVs, UTVs - Smart 12 Volt Automatic Float Charger - 021-0128 https://www.amazon.com/dp/B00068XCQU/ref=cm_sw_r_apan_glt_fabc_ZXBHNN9DP4G9CF0ET9AK?_encoding=UTF8&psc=1

BESTEK 2000W Power Inverter 3 AC Outlets DC 12V to 110V AC Car Power Converter for Camping Outdoor Power Supply ETL Listed https://www.amazon.com/dp/B00T93K9KU/ref=cm_sw_r_apan_glt_fabc_W7ZW4ZBMQAJ8FHDCTD60?_encoding=UTF8&psc=1

2 Batteries Weize 12V 9AH Rechargeable SLA Battery for Razor e200 / e200s / e225 / e300,APC UPS Computer Backup Power (BX1300LCD), APC Back-UPS NS 1250, 2 Pack https://www.amazon.com/dp/B07WRXR223/ref=cm_sw_r_apan_glt_fabc_E2TG3DAS5NH569R333S4

I have been using the battery tender plus for the last 4 years and its been great:

https://www.amazon.com/dp/B00068XCQU/ref=cm_sw_r_cp_api_glt_fabc_9DMMQHCDFS9EAZ5MKZRF

I’m using this one. Works great. Battery Tender Plus 12V Battery Charger and Maintainer: 1.25 AMP Powersport Battery Charger and Maintainer for Motorcycles, ATVs, UTVs - Smart 12 Volt Automatic Float Charger - 021-0128 https://www.amazon.com/dp/B00068XCQU/ref=cm_sw_r_cp_api_glt_fabc_FQ6DK9XBBBC5C72VA3NX?_encoding=UTF8&psc=1

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU/ref=sr_1_5?dchild=1&keywords=battery+tender&qid=1622052972&sr=8-5

Been using these for years but the one you linked should be fine as well.

I'm using this one: https://www.amazon.com/gp/product/B00068XCQU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

No bells, whistles, doodads, or whathasits. Just does what I need it to.

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU

All you need.

Yeah, it's possible you're just not driving long and/or often enough to charge the battery. I have both this battery tender and this black and decker. Both do the job just fine.

No real way around it other than to drive more.

There is a device called a battery tender that is a way to prolong battery life.

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU/

https://batteryuniversity.com/learn/archive/what_causes_car_batteries_to_fail

Try this guy, I've used it with no issue and I've seen many others use it as well: https://www.amazon.com/gp/product/B00068XCQU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I also went through this. I completely agree with everyone else, leave the humidifier at home. On top of the extra power it draws, you'll also need to pack distilled water if you're properly following the guidelines. Too much hassle.

I went through this exercise years ago, and tried to find the cheap way out to take my CPAP camping. I didn't want to spend the hundreds of dollars on a customized CPAP battery from ResMed for my S9 Elite. Not to say that spending money on those batteries is wasted, those batteries are tested and certified for flight purposes, but I didn't need that. I am a Boy Scout leader and need it for weekend and weeklong trips, with unlikely abilities to recharge the battery on those trips.

I purchased the ResMed DC power supply for the S9 Elite [link] and a Deep Cycle Marine Battery rated for 750 Cranking Amps from Costco (again, trying to for cheap, but quality). I recommend you go Marine/Deep Cycle, as that type of battery lets you drain it nearly completely without damaging the chemistry inside. Also got a Battery Tender Plus from Costco or Amazon [link] to charge the battery. I think the cost of everything was under $200 when I purchased everything.

The battery finally died on me about 2 or 3 months ago, but I've been using it since April of 2013 (batteries usually only last 5 years or so). I credit the Battery Tender for taking care of it so well - you hook it up and forget about it until you're ready to go on your trip. Since April 2013, that thing has been on countless camping trips with me, and I have never had to charge it outside of my house. The first few trips I brought the Battery Tender with me just in case (especially the week long trips), but I just didn't need it. Having the battery constantly charged has another wonderful side benefit - when a storm knocks out your power, you can still sleep at night.

My doctor recently upgraded my CPAP to the AirSense 10, so I purchased the DC power supply kit for that [link] Since the battery died, I need to replace that. I am going a little more high tech with my next power source due to some other gear I need to bring with me, but I will be getting a smaller Marine battery to keep with me as a backup since my other one was such a reliable force for so long.

These modern BMW's require a lot of juice, so if you take a lot of short drives, or don't drive the car all that much, your battery may not get fully charged often enough. I killed the original battery in my 2000 E39 after one year from when I bought it new. I had a company car and only drove the BMW after work. The battery was dead like yours and wouldn't hold a charge after that. I ended up buying a new battery and a battery tender. Problem solved. Get yourself a battery tender (Amazon sells the Deltran Battery Tender Plus for $49.94, same one I have) and hook it up every couple of weeks. It'll keep your battery nicely charged. Expect to get about 7 years or so of good battery life before you need to consider getting a new one.

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU/ref=sr_1_4?keywords=deltran+battery+tender&qid=1581050512&sr=8-4

Sorry to bother again... This looks reasonably convenient, is it more or less what we want?

https://www.amazon.com/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU

Here's the one I use:

"Fully Charge and Maintain a Battery at Proper Storage Voltage without the Damaging Effects Caused by Trickle Chargers"

https://www.amazon.ca/Battery-Tender-021-0128-Maintain-Damaging/dp/B00068XCQU

How long had it been since you last started it up?

If you're leaving it to sit for weeks at a time I would either disconnect the negative battery cable or, better yet, put a battery tinder on it to maintain the battery charge.

If the battery is running down when you leave to sit a few days then you have a parasitic draw. You can test for this but unless you are up on your electrical troubleshooting and automotive wiring it's often easier to just have an auto electric shop diagnose it for you. Old Chrysler products can be a pain in the butt when it comes to parasitic draws.