eBay

58.5V    4A  Lithium ion Battery Charger 14S  14x 3.6V / 3.7V  Lion Charger for E-bike, Golf Car

EU, US, AU, UK optional Wall socket plug
XLR Output connector

1> connected to outlets, LED1 turns to red (power), LED2 is green
2> connecting battery pack, LED2 turns red (is charging)
3> LED2 turns green by fully charged.
4> Application: for 14S  50.4V  51.8V  58.8V  L
i-ion Electronic-Bike / Electronic-Scooter Battery Packs.

Weight: 1100g
Output: 58.8V   240W
Charging current: 4A (constant current process)
Off-current: 350mA
Size: 50*90*170mm
Charger Shell material: Aluminum Case

Spec.:

Universal 110V~240V  50-60Hz  

with Plug base that could connect charger with your battery pack.

Could use solder iron to solder the wires on pins.
1 for positive / 2 for negative / 3 for empty