How long does battery Tender Junior take to charge?
The Battery Tender® Junior charges at a rate of 750mA, or 0.75A per hour. Therefore, a fully discharged 15 Amp-Hour battery will take approximately 16 hours to recharge to 80% capacity.
Can I charge an 18 volt drill battery with a 12 volt charger?
It won’t charge it higher than 12V. In other words, the 12V power supply will not serve the purpose. That means, you need to look for a charger that can deliver that same voltage value.
Can I use a different brand battery charger?

Any brand of NiMH rechargeable battery can be used in any battery charger suitable for NiMH batteries – as long as the size is compatible. However we do recommend you use reputable, well-known brands as there are some batteries and chargers of questionable quality on the market.
How do I know if my AA battery charger is working?
Check the battery charger to see how much power it’s giving off, if you continue to receive a negative reading from the batteries. A negative reading will indicate a bad battery charger, and you should replace it.
What setting do I put my battery charger on?
Basic instructions for most chargers include:
- Make sure the charger is off.
- Hook-up the positive cable on the charger to the positive terminal on the battery.
- Hook up the negative cable on the charger to the negative terminal on the battery.
- Set the charger to the slowest charge rate.
What happens if you charge a battery with the wrong voltage?

If you would apply 5 V directly to a Li-Ion battery you damage it beyond repair and it might even catch fire. There needs to be a charging circuit in between as Li-Ion cells must not be charged to more than about 4.2 V. So 5 V would be too much.
Can you overcharge a battery?
Don’t overdo it. Overcharging occurs when the device or battery is plugged into a charger after full charge has been reached and may reduce battery life. Battery University recommends that nickel- and lithium-based batteries be stored with a 40 percent state-of-charge.
What is the best fast battery charger?
The best portable chargers you can buy today
- INIU 10000mAh Portable Charger. The best portable charger overall.
- Anker PowerCore Slim 10000.
- Poweradd Slim 2.
- INIU 20W 20000 mAh power bank.
- Poweradd EnergyCell 10000.
- Anker PowerCore Essential 20000mAh.
- Anker PowerCore 5000.
- Ekrist Portable Charger Power Bank.
What is the difference between a battery tender and a trickle charger?
A trickle charger provides a constant current all the time. It does not know whether the battery is charged or discharged. A battery tender is smart. It will charge the battery only when it needs charged.
What is the difference between a battery maintainer and a battery tender?
A Battery Tender® only turns on and charges the battery when the battery requires charging while a battery charger keeps charging the battery regardless of whether it requires it or not.
What’s the difference between a battery charger and a battery tender?
What is the difference between a battery charger and a Battery Tender®? A Battery Tender® only turns on and charges the battery when the battery requires charging while a battery charger keeps charging the battery regardless of whether it requires it or not.