Best ti 84 calculator charger 2020.
1 – Tenergy TN438 16 Bay Battery Charger for AAA and AA Rechargeable Batteries, AA/AAA NiMH/NiCd Rechargeable Batteries Charger with AC Wall Adapter and Car Adapter
Top Reviews
This is only an okay charger. It is a fairly intelligent charger that does a good job of gently charging 1 to 16 AA or AAA batteries individually. The knocks some people gave for having to fumble with installing AA batteries seemed unfounded to me. I had no trouble installing any batteries; you just have to push AA’s in firmly until you hear them snap into place. Installing AAA’s is a little easier but both install easily enough for me. And the individual status on each battery is nice and being able to charge up to 16 batteries at a time is pretty good. So overall it works well and no serious complaints.Now for what’s not optimal and why it doesn’t get 5 stars. First, you want to charge batteries, not bake them. Heat shortens the useful life of a battery. They had the right idea of 500 ma for AA batteries and 250 ma for AAA batteries because you want to charge as quickly as possible without heating up the battery. I would have chosen those rates to start with myself, but then I would have lowered the AA charge rate to 400 ma because this charger generates just a tad too much heat for my liking with AA batteries. The AAA’s at a 250 ma rate don’t get hot at all and there’s a good reason. Look up the dimensions of these batteries and you will find that AAAs have 67% the surface area of AA’s. But they charge the AAAs at 50% the current (250 ma) of a AA battery. That explains why the AAAs stay cool and the AAs get a little warm. It’s not excessively hot but it’s warmer that you expect from an “intelligent” charger. Okay, they have thermal protection to prevent your battery from getting fried, but I don’t want to mildly bake my batteries either.The other ding against this charger is that it says to remove the batteries after charging. (BTW: The directions are rather skimpy.) What the heck? Remove it from the charger immediately??? I thought intelligent chargers were smart enough to shift to a trickle charge so that I could leave a whole bank of batteries plugged in there forever so that I can grab a fully charged battery whenever I want. Such a simple capability would make this a much more useful charger. But apparently it shuts off all charging after a battery has been charged and that’s that. No mention of a trickle charge anywhere. But they do tell you to remove them after they are charged.I’m a little spoiled by the outstanding LaCrosse and PowerEx chargers that give you control over all aspects of charging a battery. Heck, they can be used as laboratory instruments. The opposite end of the spectrum is the dumb fast chargers that are sometimes included when you buy rechargeable batteries. Those things are horrible. This Tenergy charger comes close to being in the middle and does a good job at things. They just barely missed by not charging at 400 ma for AAs and also having a trickle charge capability. I almost forgot to give them partial credit for having the discharge and charge refresh capability. That’s a nice feature and it seems to work well, so a little extra credit to them for that.Many people don’t realize how useful that discharge\refresh capability is. I’ve seen people comment on how their batteries get discharged from being used, so what’s the point of having a discharge capability? Well, it’s almost impossible to fully discharge a battery in most devices. Semiconductor based devices like cameras, LED flashlights, and any other electronics will stop drawing current from the battery after the voltage drops below a certain level. But there could be 10% or 15% of power left in the battery. Same thing happens with motorized devices. As soon as it slows down and becomes sluggish, you remove the batteries rather than letting them get fully drained. So this refresh capability is quite useful exercising batteries to get their full potential. Discharging and charging can get you maybe an extra 10% or more capacity because you are able to charge more deeply. Don’t believe it? Get those 2 fancy chargers I mentioned, run extensive tests on multiple brands of batteries like I have done and then you will be a believer.Bottom line, this is a good charger that could have been excellent. It is suitable for many people. I’m not going to return mine, I’m going to use it. I just could have been a little happier, that’s all. .
Well I have used this charger for less than 3 weeks. To day I put 4 aaa in to charge them thay was not dead. I needed them fully charged for the day. Come come back in 1 hr it say 3/4 full sit down at my pc. And 14 min later I hear a pop and feel hot shrapnel hit my arm and neck. I instantly knew a battery had got overcharged and exploded. The battery has only been in service less than a year. and have not had problems with any other charger with this set of 4 aaa. This is the only charger I have had that has cause the battery to explode. .
I bought bunch of these to charge AA NiMH batteries used with wireless mics. I thought it would be great to have fewer, higher capacity chargers instead of a whole wall full of 8-bay chargers.Then I got these things. Whatever protection they have in them is way too sensitive. It’s always showing errors in multiple bays. I’ve gone through and tested every battery it errors out on, and 90% of the time they pass. These are also much slower than the old 8-bay chargers I had been using.I’m going to keep them and use them for to deep discharge batches at a time, but they’re not of much other use to me. .
The ultimate charger for hobbyist and gamers, I can charge up to 16 AA or AAA independently. The LED is clear and shows you the status with pictures. I don’t use the refresh function much, but there is a button to fully discharge and charge my batteries to extend the battery overall lifespan and performance.I have converted 90% of the my batteries to rechargeables, I mainly use it for the wii, shaver, several radio control transmitter, several clocks, camera flash, wireless headphones and LED lights. This has been a great asset to recharged my batteries in batches.Works perfect as described, and if the price is within your budget, this may be for you. Recommended. If you found these extra photos useful, please take a moment to click YES below. Thanks. .
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Best ti 84 calculator charger 2020.
Best ti 84 calculator charger 2020.