For how can i charge mobil battery without using charger??

Depends upon the charge rate and voltage.
To overcharge an Li battery, may cause a fire!
Always use the correct charger.

the type of battery these mobility scooters use do not charge if the battery gets really flat. I had a relative who had his scooter taken off him by the nursing home and they left it stored in a shed without plugging it into a charger . Once it got flat the batteries would not charge at all. If only they had left it on a float charge . https://www.everybattery.com.au/deep_cycle_battery_charging.php
"Here's the problem: Most battery chargers have built-in safety features that may prevent chargers from recharging deeply discharged batteries." for more info https://www.optimabatteries.com/en-us/support/charging/resuscitate-deeply-discharged-battery

hi if youre batteries have been sitting for 18 months without a charge they r probably no good now after batteries sit for a long time the plates develop a coating & when u do charge them the they will not charge properly..youre charger guage is not a true reading the only way Is to use a battery LOAD tester this will give u a true reading on the condition of youre batteries...u can buy a battery load tester of e/bay for aprox $35 ........

It might be easier to carry a spare battery. I am not familiar with your unit. I do not understand how a jump start would work without an external power source.

Motorola FIRE XT Tips for extending battery life
Back to Previous Page

Are there any tips on how to extend the battery life?
Things you should know about charging your battery.

New batteries are not fully charged. Plug the battery charger into your phone and an electrical outlet. Your phone might take several seconds to start charging the battery.
Tips:

• It may take several charging cycles for your battery to reach optimum performance.
• The battery charger shipped with this device is designed specifically for Motorola mobile phones. Other chargers might take longer to charge your battery, or cause your calls to fail during charging.
• You can charge your phone via USB cable but this charging time will vary based on computer specifications.

Tips to extend battery life:

• Select a shorter backlight duration
• Lower the display brightness
• Use the AC adapter to charge your phone whenever possible
• Turn Bluetooth off when not in use
• Turn Wi-Fi off when not in use
• Close any third party applications running in the background
• Playing music, videos and viewing images in your phone will affect your battery life

General Battery use & safety

• Motorola recommends you always use Motorola-branded batteries and chargers. The warranty does not cover damage caused by non-Motorola batteries and/or chargers.
  
  Caution: Use of an unqualified battery or charger may present a risk of fire, explosion, leakage, or other hazard. Improper battery use, or use of a damaged battery, may result in a fire, explosion, or other hazard.
• Your battery can be charged without it being fully depleted, and can be charged every day if desired.
• Battery usage by children should be supervised.
• Important: Motorola mobile devices are designed to work best with qualified batteries. If you see a message on your display such as Invalid Battery, Invalid Charger or Unable to Charge, take the following steps:

• • Remove the battery and inspect it to confirm that it bears a Motorola "Original Equipment" hologram;
  • If there is no hologram, the battery is not a qualified battery
  • If there is a hologram, replace the battery and retry charging it
  • If the message remains, contact a Motorola Authorized Service Center
• New batteries or batteries stored for a long time may take more time to charge.
• Charging precautions: When charging your battery, keep it near room temperature. Never expose batteries to temperatures below 0°C (32°F) or above 45°C (113°F) when charging. Always take your mobile device with you when you leave your vehicle
• When storing your battery, keep it in a cool, dry place.
• It is normal over time for battery life to decrease, and for the battery to exhibit shorter runtime between charges or require more frequent or longer charging times. Motorola batteries are designed to last between 350-700 charge/discharge cycles at room temperature. This amounts to approximately a year to a year and a half of battery use for most people.
• Avoid damage to battery and mobile device. Do not disassemble, open, crush, bend, deform, puncture, shred, or submerge the battery or mobile device. Avoid dropping the battery or mobile device, especially on a hard surface. If your battery or mobile device has been subjected to such damage, take it to a local service center before using. Do not attempt to dry it with an appliance or heat source, such as a hair dryer or microwave oven.
• Use care when handling a charged battery-particularly when placing it inside a pocket, purse, or other container with metal objects. Contact with metal objects (such as jewelry, keys, beaded chains) could complete an electrical circuit (short circuit), causing the battery to become very hot, which could cause damage or injury.

Most chargers are 3 pin. Plus and minus charging voltage to the
batteries and a third pin monitors the actual battery voltage, so
that the automatic charger can turn itself off once the batteries
are fully charged. As Brad has mentioned, the connection
from the charger has to be made for the charger to produce
a voltage at those pins. The best way to see if it is charging
is to remove the seat and measure across both batteries..
assuming it's a 24volt system like most. Charging voltage
can be as high as 28volts across the positive of one 12volt
battery (connected in series to the other 12v battery) and the
negative of the other battery. You can monitor the charging
voltage across the batteries with a digital volt meter.

Yes you can overcharge a battery, it all depends on the charger your using. Most chargers are single stage chargers. Most scooters come with a single stage charger. My scooter has a built in single stage charger What this type of charger does is output a constant 24v @ 4amps.The problem is batteries amperage requirements decrease as the battery charges. An overcharge will occur when the battery is charged. It requires very little amperage to maintain a charge on a fully charged battery. A single stage charger like mine will output 4amps regardless of the state of charge of the battery. Batteries bring charged with single stage chargers loose their electrolyte. What happens is overcharged batteries break down the electrolyte into oxygen and hydrogen. So overcharging will cause a battery to "boil-out" its electrolyte. Batteries don't work without electrolyte. In the old days there were only single stage chargers. That was the state of the art back then. So to cope with the constant overcharging batteries had refill ports where you could replenish the electrolyte using distilled water.

Scooter batteries are far and away different from the lead acid of the 1970's. Scooter batteries are sealed, they are deep cycle, they use a glass mat soaked in gelled electrolyte. These glass mat batteries optimize the electrolyte used so they can use allot less of it. These newer batteries have a lot more power in a lot smaller package but they have a draw back, they must be charged properly. You can absolutely can not charge these batteries with a single stage charger. Actually you can charge with this device but you will loosed electrolyte each time you charge.

I use a three stage charger 24v @ 5amp. This charger s different from a single stage. Its what they term a "smart charger" it monitors the state of charge of the battery. As the battery charges it turns down the amperage. When the battery is fully charged the amperage is turned low enough were the charge is maintained. The entire charging process is designed to preserve electrolyte. In short this type charger will not overcharge the battery.

Click here to see the charger i currently use.
http://www.amazon.com/Sealed-Battery-Charger-3-Stage-Fan-Cooled/dp/B0051WHAU0

There might be some battery issue you need to replace this battery to another one and please don't left your mobile while you are charging battery cells going to dead if its over charge and you will going to lose your battery and mobile as well Laptop Rental Laptop Hire in UK Wales Ireland and Scotland Hire Laptops

If the scooter has been stood for that amount of time without being charged, there's a very good chance that the batteries will need replacing. The charger may not be charging the batteries as most chargers require a minimum voltage to operate (about 16-18 volts) If there is less than that amount of voltage in the batteries, the charger will not 'kick in'. This is the most likely cause, but other problems may exist which I cannot be identified without seeing the scooter (i.e. Fuse blown in charger, plug or charging circuit or fuse blown in battery wiring harness etc).